CN115738782A - Nanoscale cavity generating device and design method thereof - Google Patents
Nanoscale cavity generating device and design method thereof Download PDFInfo
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Abstract
The invention provides a nanoscale cavity generating device and a design method thereof, wherein the nanoscale cavity generating device comprises a shell, an air inlet channel and a nozzle; a mixing chamber is arranged in the shell, a water suction chamber is arranged outside the mixing chamber, and the water suction chamber is used for being communicated with a liquid medium; the mixing chamber is communicated with the water suction chamber through a guide hole and is used for enabling the liquid medium to form rotational flow when entering the mixing chamber; an air inlet channel is arranged in the mixing cavity and used for providing a gas medium into the mixing cavity; the liquid medium and the gas medium are mixed in the mixing chamber to generate nano-scale vacuole, and the mixing chamber is provided with a nozzle for outputting the nano-scale vacuole. The speed of the mixed fluid is increased after the mixed fluid passes through the nozzle, and the mixed fluid leaving the nozzle directly impacts water wrapped outside the device, so that nano bubbles are formed and stored in the liquid under the action of impact.
Description
Technical Field
The invention relates to a bubble generating device, in particular to a nanoscale cavity generating device and a design method thereof.
Background
Nanobubbles have physical and chemical properties not possessed by conventional bubbles: long existence time, high surface energy, negative charge on the surface, high gas-liquid mass transfer rate, spontaneous generation of free radicals and the like. The characteristics enable the treated nano bubbles to have unique functions, so that the nano bubbles have wide development prospect and wide application in the aspects of industrial and agricultural production, sewage treatment, washing health and the like.
At present, the methods for generating micro-nano bubbles mainly comprise four methods: ultrasonic cavitation, hydrodynamic cavitation, optical cavitation and particle cavitation, wherein hydrodynamic cavitation equipment is simple in requirement and is a common method for generating micro-nano bubbles.
Chinese patent discloses a micro-nano bubble generating device, which violently mixes gas-liquid mixed fluid by means of the combined action of jet flow and a diffusion chamber, and then generates micro-nano bubbles by impacting bubbles through high-speed flowing water in the diffusion chamber. Make aqueous vapor can acutely mix through accelerating the velocity of flow, the rethread enlarges aqueous vapor mixing volume and makes high-speed flowing water strike gaseous gassing and produce the bubble to the micro-nano bubble that produces is more in quantity, and efficiency is higher. The special cross-sectional area of the jet flow channel changes, the pressure and the speed of the gas-liquid mixed fluid continuously change, so that the purpose of mixing is achieved, and then the cross-sectional area of the bubbling channel changes, so that gas and water flow impact each other to quickly form a large amount of bubbles. Chinese patent discloses a nanometer bubble generating device, and the device is constantly pressurized, is decompressed and is realized extrusion and expansion to liquid through the liquid that the compression cylinder contains the bubble in to the jar, and the bubble is extrudeed when pressure risees and is leaded to the volume to reduce, and the expansion leads to the volume to enlarge when pressure reduction, and the bubble can constantly split new bubble at this in-process, reduces the bubble diameter to it deposits in liquid to have become nanometer bubble. The Chinese patent discloses a nanometer bubble generating device, and the device can filter the impurity of mixing in water and the air supply during, avoids piling up, blockking up, influences the life and the effect of device.
The existing patent mainly uses a bubble generating device with a larger device and an external power as a nano bubble generating device, has more device components and large volume, is difficult to be used in a less-demand environment, and has higher requirements on the installation, the working mode and the like of the device.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a nanoscale cavity generating device and a design method thereof. During the process of entering the nozzle, the liquid and the gas are extruded and fully mixed to form primary mixed fluid.
The present invention achieves the above-described object by the following technical means.
A nanometer cavitation generating device comprises a shell, an air inlet channel and a nozzle; a mixing chamber is arranged in the shell, a water suction chamber is arranged outside the mixing chamber, and the water suction chamber is used for being communicated with a liquid medium; the mixing chamber is communicated with the water suction chamber through a guide hole and is used for enabling the liquid medium to form rotational flow when entering the mixing chamber; an air inlet channel is arranged in the mixing cavity and used for providing a gas medium into the mixing cavity; the liquid medium and the gas medium are mixed in the mixing chamber to generate nano-scale vacuole, and the mixing chamber is provided with a nozzle for outputting the nano-scale vacuole.
Further, the water suction chamber is an annular space and is coaxial with the mixing chamber; the axis of the air inlet channel in the mixing cavity is coaxial with the mixing cavity and is used for enabling the gas medium to be injected into the center of the liquid medium of the rotational flow.
Furthermore, a water inlet is arranged on the shell, and the ratio of the inlet section to the outlet section of the water inlet is 2: 1-3: 1; the outlet of the water inlet is communicated with the water suction chamber. Simultaneously, the water inlet can effectively reduce the flow loss of high-pressure water before entering the mixing chamber.
Furthermore, a plurality of groups of guide holes are axially and uniformly distributed on the wall surface of the mixing chamber, and a plurality of guide holes are uniformly distributed in each group of guide holes along the circumferential direction; the distance from the guide hole to the bottom of the mixing chamber is greater than 3/4 of the height of the mixing chamber, so that water is prevented from depositing at the bottom of the device; the line between the center of the guide hole on the outer wall surface of the mixing chamber and the axis of the mixing chamber in the circumferential direction forms an included angle alpha with the axis of the guide hole within the range of 30-60 degrees, so that water flow entering the mixing chamber can rotate in the mixing chamber at a high speed.
Furthermore, the air inlet nozzle is arranged at the center of the bottom of the mixing chamber, and a concave space is arranged outside the center of the bottom of the mixing chamber, so that the section of the bottom of the mixing chamber is omega-shaped, and the impact of water on the wall surface is reduced when the water rotates in the mixing chamber, and the water is smoother; the air inlet nozzle extends out of the bottom surface of the mixing chamber; the protruding part of the air inlet nozzle is spherical or circular truncated cone-shaped and is used for preventing water flow from gathering at the outlet of the air inlet channel in an initial state to influence the air flow speed and even block the air inlet channel.
Further, the ratio of the volume of the gaseous medium entering the mixing chamber to the volume of the liquid medium entering the mixing chamber is between 1/50 and 1/10.
A design method of a nanometer-scale cavity generating device is provided, wherein the number n of target micro-nano bubbles and the diameter d of the target micro-nano bubbles are known i The amount of intake air Q in the mixing chamber is determined according to the following formula a And the liquid inlet quantity Q in the mixing chamber L ：
50Q a ≥Q L ≥10Q a
In the formula:
n is the number of target micro-nano bubbles;
d i the diameter of the target micro-nano bubble is obtained;
Q a is the air input, L/s;
t is ventilation time s;
Q L the liquid inlet amount is L/s;
k 5 is the fifth empirical parameter.
Further, the number n of target micro-nano bubbles and the diameter d of the target micro-nano bubbles are known i Determining the inlet diameter of the water inlet according to the following formula:
d 1 ＝2ck 3 n×10 -6
in the formula:
d 1 is the inlet diameter of the water inlet, cm;
c is unit length, 1cm;
k 3 k is a third empirical parameter, 0.9 is more than or equal to 3 ≤1.1；
The pilot hole diameter is determined according to the following formula:
in the formula:
d 3 is the diameter of the guide hole, cm;
j is the number of guide holes;
k 1 is the first empirical parameter.
Further, the water inlet speed v of the guide hole 2 And α satisfy the following condition:
in the formula:
r 2 is the mixing chamber radius, cm;
alpha is an included angle formed by a connecting line from the center of the guide hole on the outer wall surface of the mixing chamber to the axis of the mixing chamber in the circumferential direction and the axis of the guide hole;
m is the quality of the liquid in the mixing chamber;
g is the acceleration of gravity;
v 2 for introducing water into the guide holeSpeed, m/s, by
And (5) determining.
Further, the diameter d of the air inlet nozzle 4 Calculated according to the following formula:
v 3 ＝φv 1
in the formula:
d 4 is the diameter of the air inlet nozzle, cm;
v 3 is the air inlet speed, m/s; ,
phi is the gas-liquid velocity ratio,
v 1 is the speed of the inlet of the water inlet, m/s.
Diameter d of the mixing chamber 2 ＝k 2 d 1 Wherein k is 2 Is a second empirical parameter;
height h = k of the mixing chamber 4 d 2 Wherein k is 4 Is a fourth empirical parameter.
The invention has the beneficial effects that:
1. according to the nanoscale cavity generating device and the design method thereof, high-pressure fluid can rotate at a high speed in the mixing chamber under the structural action of the device, the high-speed rotation of the liquid provides a passage for gas on the central shaft of the mixing chamber, and the gas passes through the mixing chamber and is converged at the inlet of the nozzle. During the process of entering the nozzle, the liquid and the gas are extruded and fully mixed to form primary mixed fluid. The velocity of the mixed fluid increases after passing through the nozzle. The mixed fluid leaving the nozzle will directly impact the water that is packed outside the device, forming nanobubbles in the liquid under the impact. The device has the advantages of simple structure, convenient operation, small volume, no need of an external power device and low energy consumption.
2. The nanoscale cavity generating device and the design method thereof are characterized in that the water inlet is of a symmetrical semi-open type, and the ratio of the inlet section to the outlet section of the water inlet is 2: 1-3: 1; the export and the room intercommunication that absorbs water of water inlet, the water inlet of symmetry semi-open type can let high-pressure rivers flow more evenly before getting into the mixing chamber. Simultaneously, the water inlet can effectively reduce the flow loss of high pressure water before entering the mixing chamber.
3. According to the nanoscale cavity generating device and the design method thereof, the concave space is arranged outside the center of the bottom of the mixing chamber, so that the section of the bottom of the mixing chamber is omega-shaped, and the impact of water on the wall surface is reduced when the water rotates in the mixing chamber, and the water is smoother; the air inlet nozzle extends out of the bottom surface of the mixing chamber; the protruding part of the air inlet nozzle is spherical or circular truncated cone-shaped and is used for preventing water flow from gathering at the outlet of the air inlet channel in an initial state to influence the air flow speed and even block the air inlet channel.
4. The nanoscale cavity generating device and the design method thereof can determine the air input Q in the mixing chamber through the number n of target micro-nano bubbles and the diameter di of the target micro-nano bubbles a And the liquid inlet quantity Q in the mixing chamber L And providing a basis for additional design.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a schematic view of a nanoscale cavitation generation device according to the present invention.
Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.
Fig. 3a is a schematic view of a nozzle design 1 according to the present invention.
Figure 3b is a schematic view of the nozzle design 2 according to the present invention.
Figure 3c is a schematic view of a nozzle design 3 according to the present invention.
Figure 4a is a schematic view of a nozzle design 1 according to the present invention.
Figure 4b is a schematic view of the nozzle design 2 of the present invention.
FIG. 5a is a cross-sectional view B-B of the nanoscale cavitation device of FIG. 1 according to example 1.
FIG. 5B is a cross-sectional view B-B of the nanoscale cavitation device of FIG. 1 according to example 2.
FIG. 6 is a graph of the bubble size counted in the sample experiment.
FIG. 7 is a bubble distribution diagram of the sample.
In the figure:
100-a top cover; 200-sealing the housing; 300-a mixing chamber; 301-a guide hole; 400-an air inlet channel; 401-an air inlet nozzle; 500-a nozzle; 600-a water suction chamber. 601-water inlet.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and 2, the nanoscale cavity generating device according to the present invention includes a housing, an inlet channel 400, and a nozzle 500;
the shell comprises a top cover 100, a sealed shell 200 and a mixing cavity shell, wherein the materials of the sealed shell 200, the top cover 100 and the mixing cavity shell are selected to be transparent or semitransparent materials as much as possible so as to facilitate observation of the internal reaction condition of the device.
The top cover 100 is respectively connected with the sealed shell 200 and the mixing cavity shell, a mixing cavity 300 is formed between the mixing cavity shell and the top cover 100, and a water suction chamber 600 is formed among the top cover 100, the sealed shell 200 and the outer wall of the mixing cavity shell; the top cover 100 provides a fixed support for the mixing chamber 300, and the top cover 100 is centrally located to engage a nozzle as the outlet of the target product from the apparatus. The hermetic container 200 can isolate the entire apparatus from the outside. Because the device during operation is located under water, the water that can avoid external parcel of shell produces the influence to the device normal work. The bottom of the sealed housing 200 is provided with a water inlet 601 of the water suction chamber 600. The water suction chamber 600 is used for communicating a liquid medium; the mixing chamber 300 is communicated with the water suction chamber 600 through the guide hole 301, and is used for enabling the liquid medium to form rotational flow when entering the mixing chamber 300; an air inlet channel 400 is arranged in the mixing chamber 300 and is used for providing a gas medium into the mixing chamber 300; the liquid medium and the gaseous medium generate nano-scale cavitation bubbles after being mixed in the mixing chamber 300.
As shown in fig. 2, the suction chamber 600 is an annular space, and the suction chamber 600 is coaxial with the mixing chamber 300; the axis of the inlet channel 400 in the mixing chamber 300 is coaxial with the mixing chamber 300 for injecting the gaseous medium into the center of the swirling liquid medium. A plurality of groups of guide holes are axially and uniformly distributed on the wall surface of the mixing chamber 300, and a plurality of guide holes are uniformly distributed on each group of guide holes along the circumferential direction; the distance from the guide hole to the bottom of the mixing chamber 300 is greater than 3/4 of the height of the mixing chamber 300, so as to avoid water from depositing at the bottom of the device; an included angle alpha formed by a connecting line from the center of the guide hole 301 to the axial center of the mixing chamber 300 in the circumferential direction and the axial line of the guide hole 301 is 30-60 degrees, so that water flow entering the mixing chamber can rotate at high speed in the mixing chamber.
As shown in fig. 1 and fig. 2, a water inlet 601 is provided on the housing, and the water inlet is a symmetrical semi-open type, that is, one end of the annular flow channel is an inlet, and the other end opposite to the inlet is a blocking plate, so that the annular flow channel is changed into a symmetrical semi-open type flow channel. The outlet cross section of the water inlet 601 is an annular section intersecting the suction chamber. The water inlet of symmetry semi-open type can let high-pressure rivers flow more evenly before getting into the mixing chamber. Simultaneously, the water inlet can effectively reduce the flow loss of high pressure water before entering the mixing chamber. The ratio of the inlet section to the outlet section of the water inlet 601 is 2: 1-3: 1; the outlet of the water inlet 601 is communicated with the water suction chamber 600. The flow channel shape of the water inlet 601 is shown in fig. 5a and 5b, in an exemplary embodiment, a symmetrical semi-open annular water inlet 601 structure with a constant radius is selected, so that the internal velocity vector field of the suction chamber can be improved while the design requirement is met, as shown in fig. 5a; in another example, a radius-gradually-changing flow passage is selected for the symmetrical semi-open annular water inlet 601, as shown in FIG. 5b.
An air inlet nozzle 401 is installed at the center of the bottom of the mixing chamber 300, a concave space is arranged outside the center of the bottom of the mixing chamber 300, so that the section of the bottom of the mixing chamber 300 is omega-shaped, and impact of water on a wall surface is reduced when the water rotates in the mixing chamber, and the water is smoother; the air inlet nozzle 401 extends out of the bottom surface of the mixing chamber 300; the extended part of the air inlet nozzle 401 is spherical or circular truncated cone-shaped and is used for preventing water flow from gathering at the outlet of the air inlet channel in an initial state to influence air flow speed and even block the air inlet channel. As shown in fig. 4a, the air inlet nozzle 401 is designed to be 1a spherical boss; as shown in fig. 4b, the air inlet nozzle 401 is designed 1 as a truncated cone shaped boss.
The ratio of the volume of gaseous medium entering said mixing chamber 300 to the volume of liquid medium entering said mixing chamber 300 is between 1/50 and 1/10, such that 10 is obtained 6 An order of magnitude of vapor bubble.
The working principle is as follows:
in practical application, the device can be located underwater, namely the periphery of the device is wrapped by water. High pressure water enters the water inlet and moves upward through the water suction chamber 600. The mixing chamber remains stationary, and high pressure water guiding hole 301 gets into mixing chamber 300, and the high pressure provides higher initial velocity for rivers, and the rotatory rivers of high speed assemble in the region of keeping away from the axis under the effect of centrifugal force, simultaneously because the fluid assembles to the wall, can have a less region of pressure in center pin department. After entering the mixing chamber 300 through the inlet channel 400, the gas flow moves together with the water flow inside, and due to the fact that other density is less than that of the liquid, the gas is converged on the central axis under the action of centrifugal force. Also due to the density difference, the gas will move continuously upwards along the central axis. The water and air flow continuously enter the mixing chamber 300, and the fluid entering first is necessarily squeezed by the fluid entering later. Under this action, the air and water flow continues to move until it rises to the inlet of the nozzle 500. The water and air flow may be forced into the nozzle 500. The mixed fluid passes through the nozzle 500 and the higher static pressure energy is converted to kinetic energy, causing the fluid exiting the nozzle to decrease in pressure and increase in velocity compared to the fluid entering the nozzle. The high velocity mixed fluid exiting the nozzle will directly impact the water surrounding the periphery of the device. The target product is obtained by such impact.
The nozzle 500 serves as a passage for fluid to exit the device and is also an important component of the creation of the void. The interface change of the nozzle can change the pressure velocity of the fluid, as shown in fig. 3a, 3b and 3c for three example nozzle shape diagrams. Wherein in fig. 3a, the nozzle 500 has a linear divergent flow path; in fig. 3b, the curvature of the flow channel of the nozzle 500 is gradually increased; in fig. 3c, the nozzle 500 has a gradually increasing curvature. The spray head may be embodied in many different forms and is not limited to the embodiments described herein.
The nozzle 500 is directly connected to the central opening of the top cover. As a key part of the production of target products, high sealability is required at the impact joint in order to cope with high-pressure fluid. In an exemplary embodiment, the connection between the nozzle 500 and the cap is a threaded connection, preferably a threaded pipe, to ensure sealing. Other thread forms capable of meeting the sealing performance requirement can be selected. Meanwhile, the nozzle 500 is the main position where the fluid leaves the device and directly interacts with the external fluid, and is subjected to a large force, and a material with high hardness, such as SUS301, is adopted.
According to the design method of the nano-scale cavity generating device, the number n of target micro-nano bubbles and the diameter d of the target micro-nano bubbles are known i The amount Q of intake air in the mixing chamber 300 is determined according to the following formula a And the liquid inlet amount Q in the mixing chamber 300 L ：
50Q a ≥Q L ≥10Q a
In the formula:
n is the number of target micro-nano bubbles;
d i the diameter of the target micro-nano bubble is obtained;
Q a is the air input, L/s;
t is ventilation time, s;
Q L the liquid inlet amount is L/s;
k 5 for the fifth meridianCounting; generally take k 5 =0.01-0.02, recommended value is 0.02;
knowing the number n of target micro-nano bubbles and the diameter d of the target micro-nano bubbles i The inlet diameter of the water inlet 601 is determined according to the following formula:
d 1 ＝2k 3 n×10 -6
in the formula:
d 1 is the inlet diameter of the water inlet 601, cm;
k 3 is a third empirical parameter; k is a radical of 3 K is not less than 0.9 3 1.1. Ltoreq.k, a general recommended selection 3 ＝1。
The diameter of the pilot hole 301 is determined according to the following formula:
in the formula:
d 3 is the diameter of the guide hole 301, cm;
j is the number of pilot holes 301;
k 1 is a first empirical parameter, k 1 K is not less than 0.75 1 1 ≦ general recommended selection k 1 ＝0.75。
The water inlet speed v of the guide hole 301 2 And α satisfy the following condition:
in the formula:
r 2 is the mixing chamber radius, cm;
alpha is an included angle formed by a connecting line from the center of the guide hole 301 on the outer wall surface of the mixing chamber 300 to the axial center of the mixing chamber 300 in the circumferential direction and the axial line of the guide hole 301;
m is the mass of the liquid in the mixing chamber 300;
g is the acceleration of gravity;
v 2 is a guide hole 301 entry velocity, m/s, through
And (4) determining.
Diameter d of air inlet nozzle 401 4 Calculated according to the following formula:
in the formula:
d 4 is the diameter of the air inlet nozzle 401, cm;
v 3 is the air inlet speed, m/s; ,
v 1 is the velocity, m/s, of the inlet of the water inlet 601.
Diameter d of the mixing chamber 300 2 ＝k 2 d 1 Wherein k is 2 Is a second empirical parameter; k is more than or equal to 1.5 2 2.5. Ltoreq.k, a general recommended selection 2 ＝2。
Height h = k of the mixing chamber 300 4 d 2 Wherein k is 4 Is a fourth empirical parameter. K is more than or equal to 1.5 4 2.5. Ltoreq.k, a general recommended selection 4 ＝2。
Examples
The number n of the target micro-nano bubbles is known to be 1 multiplied by 10 6 Diameter d of target micro-nano bubble i Is a molecular weight distribution of 20 nm and,
suction chamber inlet diameter d 1 Calculating out：
d 1 ＝2k 3 n×10 -6 ＝2(cm)
Air input Q a And (3) calculating:
take the recommended value k 5 ＝0.02，Q a ＝0.0492(L/s).
Water inflow Q L And (3) calculating:
calculating the minimum inflow according with the requirement, Q L ＝10Q a ≈0.5(L/s)。
Diameter d of wall opening 3 And (3) calculating:
take the recommended value k 1 =0.75, then d 3 =0.5cm. j takes 12;
wall surface opening water inlet speed v 2 And (3) calculating:
calculated v 2 =2 (m/s). Alpha is 30 degrees, and the centripetal force requirement of the device is checked to meet the requirement.
Suction chamber inlet velocity v 1 And (3) calculating:
calculated v 1 ＝1.5(m/s)。
Intake velocity v 3 And (3) calculating:
Diameter d of air inlet 4 And (3) calculating:
calculated d 4 ＝2(cm)。
Mixing chamber diameter d 2 And (3) calculating: d is a radical of 2 ＝k 2 d 1 ，k 2 Take the recommended value k 2 If =2 is calculated, then d 2 ＝4(cm)。
Mixing chamber height calculation: h = k 4 d 2 K4 takes the recommended value k 4 ＝2，h＝2d 2 ＝8(cm)。
According to the designed nano-scale cavitation generating device parameter, namely the diameter d of the inlet of the water suction chamber 1 =2.0 (cm); diameter d of wall opening 3 =0.5 (cm); diameter d of air inlet 4 =2 (cm); mixing chamber diameter d 2 =4 (cm); the mixing chamber height calculation h =8 (cm), modeled as shown in fig. 6.
At the air intake quantity Q a =0.049 (L/S), water inflow Q L Under the working conditions that the water pressure is 0.4Mpa and the air pressure is 1atm, =0.47 (L/s), the experimental result is that: stopping the device 15s after the device is stable in operation, counting, and measuring the distance of about 40cm above the nozzle at a position 5-10cm above the nozzle 2 Zone product count: counting area: 1.6mm 2 。
As shown in fig. 7, the total number of bubbles in the region is 1123, and when an error is considered in the edge region, 90% of the total number is the actual amount of bubbles. The actual micro-nano bubble quantity obtained by conversion is about 2.5 multiplied by 10 6 And within the expected range.
It should be understood that although the specification has been described in terms of various embodiments, not every embodiment includes every single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole can be combined as appropriate to form additional embodiments as will be apparent to those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A nanometer-scale cavitation generation device is characterized by comprising a shell, an air inlet channel (400) and a nozzle (500); a mixing chamber (300) is arranged in the shell, a water suction chamber (600) is arranged outside the mixing chamber (300), and the water suction chamber (600) is used for being communicated with a liquid medium; the mixing chamber (300) is communicated with the water suction chamber (600) through a guide hole (301) and is used for enabling the liquid medium to form rotational flow when entering the mixing chamber (300); an air inlet channel (400) is arranged in the mixing chamber (300) and is used for providing a gas medium into the mixing chamber (300); the liquid medium and the gas medium are mixed in the mixing chamber (300) to generate nano-scale vacuole, and the mixing chamber (300) is provided with a nozzle (500) for outputting the nano-scale vacuole.
2. The nanoscale cavitation-generating device according to claim 1, characterized in that the suction chamber (600) is an annular space, the suction chamber (600) being coaxial with the mixing chamber (300); the axis of the air inlet channel (400) in the mixing chamber (300) is coaxial with the mixing chamber (300) and is used for enabling the gas medium to be injected into the center of the swirling liquid medium.
3. The nanoscale cavitation device according to claim 1, characterized in that the shell is provided with a water inlet (601), the ratio of the inlet cross section to the outlet cross section of the water inlet (601) is (2); the outlet of the water inlet (601) is communicated with the water suction chamber (600).
4. The nanoscale cavitation bubble generation device according to claim 1, characterized in that a plurality of groups of guide holes are axially and uniformly distributed on the wall surface of the mixing chamber (300), and a plurality of guide holes are uniformly distributed on each group of guide holes along the circumferential direction; the distance from the guide hole to the bottom of the mixing chamber (300) is more than 3/4 of the height of the mixing chamber (300); an included angle alpha formed by a connecting line from the center of the guide hole (301) positioned on the outer wall surface of the mixing chamber (300) to the axial center of the mixing chamber (300) in the circumferential direction and the axial line of the guide hole (301) ranges from 30 degrees to 60 degrees.
5. The nanoscale cavitation bubble generation device according to claim 2, characterized in that the air inlet nozzle (401) is installed at the center of the bottom of the mixing chamber (300), and a concave space is provided outside the center of the bottom of the mixing chamber (300) to make the cross section of the bottom of the mixing chamber (300) in an omega shape; the air inlet nozzle (401) extends out of the bottom surface of the mixing chamber (300); the protruding part of the air inlet nozzle (401) is spherical or circular truncated cone-shaped.
6. The nanoscale cavitation-generating device according to claim 1, characterized in that the ratio of the volume of gaseous medium entering the mixing chamber (300) to the volume of liquid medium entering the mixing chamber (300) is between 1/50 and 1/10.
7. A design method of the nanometer-scale cavitation generation device according to any one of claims 1 to 6, characterized in that the number n of target micro-nano bubbles and the diameter d of the target micro-nano bubbles are known i The amount of intake air Q in the mixing chamber (300) is determined according to the following formula a And the liquid inlet quantity Q in the mixing chamber (300) L ：
50Q a ≥Q L ≥10Q a
In the formula:
n is the number of target micro-nano bubbles;
d i the diameter of the target micro-nano bubble is obtained;
Q a is the air input, L/s;
t is ventilation time, s;
Q L the liquid inlet amount is L/s;
k 5 is the fifth empirical parameter.
8. The design method of nanometer-scale cavitation generation device according to claim 7, characterized in that the number n of target micro-nano bubbles and the diameter d of target micro-nano bubbles are known i Determining an inlet diameter of the water inlet (601) according to the following formula:
d 1 ＝2ck 3 n×10 -6
in the formula:
d 1 is the diameter of the inlet of the water inlet (601) in cm;
c is unit length, 1cm;
k 3 is a third empirical parameter;
the diameter of the pilot hole (301) is determined according to the following formula:
in the formula:
d 3 is the diameter, cm, of the guide hole (301);
j is the number of the guide holes (301);
k 1 is the first empirical parameter.
9. The design method of nanometer-scale cavitation bubble generation device according to claim 7, characterized in that, the water inlet speed v of the guide hole (301) 2 And α satisfy the following condition:
in the formula:
r 2 is the mixing chamber radius, cm;
alpha is an included angle formed by a connecting line from the center of the guide hole (301) on the outer wall surface of the mixing chamber (300) to the axis of the mixing chamber (300) in the circumferential direction and the axis of the guide hole (301);
m is the mass of the liquid in the mixing chamber (300);
g is the acceleration of gravity;
v 2 for guiding the water entry speed, m/s, of the hole (301)
And (4) determining.
10. The design method of nanometer-scale cavitation generation device according to claim 7, characterized in that, the diameter d of the air inlet nozzle (401) 4 Calculated according to the following formula:
v 3 ＝φv 1
in the formula:
d 4 the diameter of the air inlet nozzle (401) is cm;
v 3 is the air inlet speed, m/s; ,
phi is the gas-liquid velocity ratio,
v 1 is the speed of the inlet of the water inlet (601), m/s.
Diameter d of the mixing chamber (300) 2 ＝k 2 d 1 Wherein k is 2 Is a second empirical parameter;
the height h = k of the mixing chamber (300) 4 d 2 Wherein k is 4 Is a fourth empirical parameter.
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