CN106932394B - Device and method for evaluating influence of super-gravity rotating bed filler on liquid flow - Google Patents
Device and method for evaluating influence of super-gravity rotating bed filler on liquid flow Download PDFInfo
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- CN106932394B CN106932394B CN201511020741.7A CN201511020741A CN106932394B CN 106932394 B CN106932394 B CN 106932394B CN 201511020741 A CN201511020741 A CN 201511020741A CN 106932394 B CN106932394 B CN 106932394B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention discloses a device and a method for evaluating influence of a supergravity rotating bed filler on liquid flow. The evaluation device comprises a bracket, and an annular light source, a filler, a high-speed camera, a liquid inlet pipe, a motor supporting plate, a motor, a rotating shaft, a balance block, a rotating disk and a rotating disk fastening nut which are positioned in the bracket; the motor is positioned on the motor supporting plate and is connected with the rotating disc through a rotating shaft; the annular light source is positioned below the rotating disk; the filler and the high-speed camera are fixed on one side of the rotating disc, and the high-speed camera is positioned above the filler; the balance block is arranged on the other side of the rotating disc; the liquid inlet pipe is positioned below the motor and above the rotating disc and extends to the filler; the rotating shaft is connected with the rotating disc through a rotating disc fastening nut; the rotating disc is made of transparent material. The technical scheme of the invention overcomes the defects of a common measuring device, realizes accurate evaluation of the influence of the modified filler of the super-gravity rotating bed on the liquid flow, and has the advantages of simulation practicability, accuracy, instantaneity and the like.
Description
Technical Field
The invention relates to a filler evaluation device and method, in particular to an evaluation device and method for influence of a super-gravity rotating bed filler on liquid flow.
Background
The nineteenth century and the seventies, the british empire chemical company put forward the supergravity technology for the first time, and invented the core device of the supergravity technology, namely the supergravity Rotating Bed (Rotating Packed Bed, abbreviated as RPB). The super-gravity rotating bed is powered by a motor, and generates centrifugal force through rotation, so that a super-gravity environment which cannot be achieved on the earth is simulated. As a leading-edge technology of chemical engineering reinforcement, the super-gravity rotating bed is suitable for a multiphase rapid reaction process needing reinforcement on interphase mass transfer, heat transfer and molecular mixing.
Like packed column devices, packing plays a very important role in a high gravity rotating bed. In the high-gravity rotating bed, liquid phase is thrown out to the outer edge of the rotor by overcoming the surface tension of the liquid phase attached to the surface of the filler under the action of centrifugal force. In the process, the liquid is dispersed into small liquid microelements (such as liquid drops, liquid filaments and the like) under the shearing action of the filler, so that the effective mass transfer surface area of the rotating bed is greatly increased, and the liquid-phase volume mass transfer coefficient is remarkably improved.
Also, the hydrodynamic properties of the filler play a crucial role for the properties of the filler. Different liquid forms have important influence on the effective mass transfer surface area and the liquid phase volume mass transfer coefficient of the hypergravity rotating bed. Research shows that under the same other conditions, the liquid mass transfer can be obviously enhanced by increasing the number of liquid drops, reducing the forms of liquid films, liquid filaments and the like. Therefore, the superiority and inferiority of the high-gravity rotating bed packing were evaluated in terms of shearing, pulverization and the like of the packing against the flowing liquid.
In the past, researchers have studied that static liquid drops or liquid columns with certain speed impact the surface of a material under the condition of earth gravity. The visual research of fluid flow in the hypergravity revolving bed is mainly focused on the cavity area, and the research on the liquid form change after liquid passes through the filler and the liquid flow form inside the filler is more accurate. Meanwhile, a common supergravity rotating bed is provided with a shell upper cover and a rotor upper cover, and the axial thickness and the radial thickness of the filler are large, so that the visual shooting of liquid flowing is not facilitated. Therefore, it is necessary to provide an apparatus and a method for evaluating the influence of the supergravity rotating bed packing on the liquid flow.
Disclosure of Invention
The first purpose of the invention is to provide an evaluation device for the influence of the high-gravity rotating bed packing on the liquid flow. The device can evaluate the influence of the fillers with different properties on the liquid flowing form in a centrifugal force field on line, and can quickly and conveniently realize the screening of the fillers of the super-gravity rotating bed.
The second purpose of the invention is to provide a method for evaluating the influence of the super-gravity rotating bed packing on the liquid flow.
In order to achieve the first purpose, the invention adopts the following technical scheme:
an evaluation device for the influence of a supergravity rotating bed filler on liquid flow comprises a support (2.1), and an annular light source (2.2), a filler (2.3), a high-speed camera (2.4), a liquid inlet pipe (2.5), a motor supporting plate (2.6), a motor (2.7), a rotating shaft (2.8), a balancing block (2.9), a rotating disc (2.10) and a rotating disc fastening nut (2.11) which are positioned inside the support (2.1); the motor (2.7) is positioned on the motor supporting plate (2.6) and is connected with the rotating disc (2.10) through a rotating shaft (2.8); the annular light source (2.2, 2.12) is located below the rotating disc (2.10); the filler (2.3) and the high-speed camera (2.4) are fixed on one side of the rotating disc (2.10), and the high-speed camera (2.4) is positioned above the filler (2.3); a balance weight (2.9) is arranged on the other side of the rotating disk (2.10) corresponding to the filler (2.3) and the high-speed camera (2.4); the liquid inlet pipe (2.5) is positioned below the motor (2.7) and above the rotating disc (2.10) and extends to the filler (2.3); the rotating shaft (2.8) is connected with the rotating disc (2.10) through a rotating disc fastening nut (2.11); the rotating disc (2.10) is made of transparent materials.
Preferably, when the motor 2.7 rotates, the motor 2.7 drives the lower rotating disk 2.10 to rotate together through the rotating shaft 2.8.
Preferably, the high-speed camera (2.4) is fixed above the rotating disk (2.10) and moves along with the rotating disk (2.10), and the high-speed camera (2.4) is positioned above the filler (2.3) and the lens is perpendicular to the direction of the filler (2.3).
Preferably, the rotating disc (2.10) has a hypergravity level of 10-1000g and a diameter of 30-3000 mm.
More preferably, the rotating disc (2.10) has a hypergravity level of 50-300g and a diameter of 100-500 mm.
Preferably, the high-speed camera (2.4) is connected with a computer through a data line, and the change of the liquid form after the liquid passes through the filler and the flowing form of the liquid in the filler are recorded in real time through the computer. An annular light source 2.2 is arranged below the rotating disk 2.10, so that a sufficient light source can be provided for the high-speed camera 2.4, and the quality of a shot image is ensured.
Preferably, a fixing frame is arranged on the rotating disc (2.10) and used for fixing the filler (2.3) on the rotating disc (2.10), and the filler (2.3) is detached and replaced through the fixing frame.
Preferably, the weight of the balance weight (2.9) is matched with the weight of the filler (2.3) and the high-speed camera (2.4) on the other side of the rotating disc (2.10) so as to ensure balance and stability when the rotating disc (2.10) rotates. The balance weight 2.9 can be detached, the weight of the balance weight is reasonably adjusted according to the weight of the filler and the high-speed camera, and balance and stability of the rotating disk are guaranteed.
Preferably, the liquid inlet pipe (2.5) sprays the liquid vertically on one side of the packing (2.3), and the liquid passes from one side of the packing to the other side under the centrifugal force condition.
Preferably, the filler 2.3 is located on one side of the rotating disc 2.10, and the rotating disc 2.10 is provided with a fixing frame, so that the filler 2.3 can be fixed on the rotating disc 2.10, and the filler 2.3 is ensured to move along with the rotating disc 2.10, thereby simulating a supergravity environment in which the filler 2.3 is located. Different fillers 2.3 can be removed and replaced by a filler holder above the rotating disc 2.10.
Preferably, the filler (2.3) includes, but is not limited to, a metal filler, a plastic filler or a foam filler; the filler can be a conventional filler with an untreated surface, and can also be a filler with a modified surface. The motor supporting plate (2.6), the rotating disc (2.10), the liquid inlet pipe (2.5) and the rotating shaft (2.8) are made of stainless steel.
Preferably, the bottom of the liquid inlet pipe 2.5 is connected with a liquid distributor, and the liquid is vertically injected to one side of the packing 2.3 through the liquid distributor.
In order to achieve the second purpose, the invention adopts the following technical scheme:
the method for evaluating the influence of the super-gravity rotating bed packing on the liquid flow by adopting the evaluation device comprises the following steps:
fixing the filler to be evaluated on a rotating disc, adjusting the weight of a balance block to keep the rotating disc stable, adjusting the rotating speed of the rotating disc, and keeping the supergravity horizontal range at 10-1000 g; connecting a camera with a computer, and acquiring a real-time image by the computer; and starting a light source and an experimental device power supply, allowing liquid to enter, and storing the liquid form change after the liquid passes through the filler and the liquid flowing form in the filler through a computer.
Compared with the prior art, the evaluation device is improved in many aspects:
(1) the measurement of the performance of the filler under the hypergravity environment is realized: the high-speed camera and the filler are placed on the same side of the rotating disc, the high-speed camera is fixed on the rotating disc and moves along with the rotating disc, the environment of supergravity is simulated through the rotation of the rotating disc, and the defect that the existing measuring device cannot simulate the overweight environment is overcome.
(2) The accuracy evaluation of the performance of the filler is realized: after liquid passes through the filler, the change of the liquid form is recorded by a high-speed camera, and the accurate description of the liquid form is realized by the measurement of software, so that the defect that the traditional evaluation device cannot accurately describe the liquid form is overcome.
(3) The real-time evaluation on the performance of the filler is realized: the liquid inlet pipe vertically sprays liquid on one side of the filler to ensure that the liquid can be visually observed to reach the other side from one side of the filler under the centrifugal force condition; an annular light source is arranged right below the filler, so that the brightness requirement of camera shooting is ensured. The high-speed camera is connected with a computer through a data line, the change of the liquid form after the liquid passes through the filler and the liquid flowing form in the filler can be recorded in real time through the computer, and the influence of the modified filler on the liquid flowing form is evaluated according to the difference of the liquid forms.
The invention has the following beneficial effects:
the technical scheme of the invention realizes accurate evaluation of the influence of the modified filler of the super-gravity rotating bed on the liquid flow, has the advantages of simulation practicability, accuracy, real-time property and the like, and overcomes the defects of a common measuring device.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic of the inventive filler evaluation system.
Fig. 2 shows a schematic configuration of the filler evaluation device of the present invention.
Fig. 3 shows a schematic view of a data acquisition system of the filling evaluation device of the present invention.
Fig. 4A-4D show digital photographs taken by the filling evaluation device of the present invention of liquid being cut into small droplets as it passes through the filling 0.01s-0.04 s.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The structural schematic diagram of the device for evaluating the influence of the super-gravity rotating bed modified packing on the liquid flow is shown in figure 2, wherein the values represented by the figures are as follows:
2.1-scaffold; 2.2-ring light source; 2.3-a filler; 2.4-high speed camera; 2.5-liquid inlet pipe; 2.6-motor supporting plate; 2.7-motor; 2.8-rotation axis; 2.9-counterbalance; 2.10-rotating disk; 2.11-rotating the disc to tighten the nut.
The evaluation device comprises an annular light source 2.2 arranged in a support 2.1, a filler 2.3, a high-speed camera 2.4, a liquid inlet pipe 2.5, a motor supporting plate 2.6, a motor 2.7, a rotating shaft 2.8, a balancing block 2.9, a rotating disc 2.10 and a rotating disc fastening nut 2.11. The motor 2.7 is arranged on the motor supporting plate 2.6 and is connected with the rotating disk 2.10 at the bottom through a rotating shaft 2.8, so that the rotating disk 2.10 at the bottom moves along with the motor 2.7. The annular light source 2.2 is located at the bottom of the rotating disc 2.10, and the rotating disc 2.10 is made of transparent materials. The filler 2.3 is fixed on one side of the rotating disc 2.10, the high-speed camera 2.4 is positioned above the filler 2.3, the high-speed camera 2.4 is vertically arranged with the filler 2.3, the rotating disc 2.10 corresponding to the side of the filler camera is provided with a balance block 2.9, and the weight of the balance block is matched with the weight of the filler camera. The liquid inlet pipe 2.5 is located below the motor 2.7 and above the rotating disc 2.10 and extends to the packing 2.3, spraying the liquid on the side of the packing 2.3. The rotating shaft 2.8 is connected with the rotating disc 2.10 through a rotating disc fastening nut 2.11. The high-speed camera 2.4 is connected with a computer through a data line, and the computer records the liquid form change of the liquid after the liquid passes through the filler and the liquid flowing form in the filler in real time. The rotating disc 2.10 is provided with a fixing frame for fixing the filler 2.3 on the rotating disc 2.10, and the filler 2.3 is detached and replaced through the fixing frame.
The supergravity level of the rotating disc 2.10 is 10-1000g, and the diameter is 30-3000 mm.
Preferably, the rotating disc 2.10 has a hypergravity level of 50-300g and a diameter of 100-500 mm.
The filler 2.3 includes, but is not limited to, a metal filler, a plastic filler, or a foam filler.
The motor supporting plate 2.6, the rotating disc 2.10, the liquid inlet pipe 2.5 and the rotating shaft 2.8 are made of stainless steel.
FIG. 1 is a schematic representation of a filler evaluation system according to the invention, in which the numerals represent:
1-a solution storage tank; 2-liquid pump; 3-a valve; 4-a liquid flow meter; 5-a filler evaluation device; 6-computer.
The solution in the solution storage tank 1 is pumped into a filling evaluation device 5 of the invention through a liquid pump 2, the liquid flow is controlled by a valve 3 and a liquid flow meter 4, a high-speed camera is connected with a computer through a data line, and a computer 6 acquires image signals.
The working principle of the evaluation device of the invention is as follows:
the bottom of the liquid inlet pipe 2.5 is connected with the liquid distributor, liquid in the liquid inlet pipe enters the liquid distributor and then is sprayed to the inner side of the filler 2.3 through the distribution holes in the liquid distributor, and the rotating disc 2.10 rotates at a high speed to rapidly throw the liquid to the other side of the filler. The bottom annular light source 2.2 provides light source support for the whole device, the high-speed camera 2.4 records the flowing process of liquid in the filling material in real time, and image signals are transmitted to the computer 6 through a data acquisition line to be displayed in real time.
The method for evaluating the influence of the filler of the hypergravity revolving bed on the liquid flow by the device comprises the following steps:
before the experiment begins, a camera data line is connected with a computer, a bottom annular light source is started at the same time, the filler to be evaluated is fixed on a rotating disk, and the weight of a balance block is adjusted to keep the rotating disk stable. And opening the rotary packed bed, after the rotating speed is stable, starting the liquid pump, adjusting the valve to ensure that the liquid keeps a stable flowing state, and leading the liquid to reach one side of the filler through the liquid feeding pipe. The image signal of the liquid flowing form is transmitted to a computer through a data acquisition line, the liquid form change after the liquid passes through the filler and the liquid flowing form in the filler are displayed on a computer screen in real time, and the influence of the filler modification on the fluid flow is evaluated by comparing different flowing forms of the liquid. The supergravity horizontal range of the rotating disc is 10-1000 g.
FIG. 3 is a schematic view of a data acquisition system of the filling evaluation device of the present invention. As shown in fig. 3, the high-speed camera captures the flow pattern of the liquid passing through the packing in real time, and the flow pattern is converted into real-time image information by the data conversion system.
In the invention, the evaluation of the liquid form change after the liquid in the rotating packed bed passes through the packing and the reliability of the liquid flow form in the packing comprises the following three aspects: simulating a hypergravity environment, data transmission real-time performance and accurate recording performance.
The simulation of the hypergravity environment is realized by rotating a turntable connected with a motor. Real-time recording is achieved by adjusting the shutter speed of the high-speed camera. The shutter speed is adjusted to allow the camera to record the droplet morphology at different times and the effect of the filler on the droplets in real time. The accuracy is realized by the resolution ratio of the high-speed camera and the number of the shooting frames, the high-speed camera adopts the speed of 1000-2000 frames per second to accurately track and analyze the size and the form change of each liquid drop, and therefore the influence of the form change of the liquid after the liquid in the rotary packed bed passes through the packing and the flow form of the liquid in the packing is obtained.
Example 2
A method for evaluating the influence of a modified filler of a super-gravity rotating bed on liquid flow comprises the following steps:
the stainless steel wire mesh filler is fixed on the rotating disc support, water flow is set to be 50L/h, the stainless steel wire mesh filler is pumped into the liquid inlet pipe by the pump, the stainless steel wire mesh filler is uniformly sprayed to one side of the filler through the liquid distributor, the bottom annular light source and the high-speed camera are started, the rotor is set to be 50g of the high-gravity factor, the number of generated filial generation liquid drops and the change of the specific surface area are recorded in real time, and the number distribution of the filial generation liquid drops and the liquid flowing rule are. FIGS. 4A-4D are digital photographs taken of a liquid cut into small droplets through the point 0.01s-0.04s of the packing by the packing evaluation apparatus of the present invention. Fig. 4A was taken at time 0.01s, fig. 4B was taken at time 0.02s, fig. 4C was taken at time 0.03s, and fig. 4D was taken at time 0.04 s. According to the obtained pictures, the distribution of the diameters of filial generation liquid drops generated after the liquid passes through the wire mesh packing can be known through computer processing, and the liquid drop form changes at different times can be known.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. The utility model provides an evaluation device of hypergravity revolving bed packing to liquid flow influence which characterized in that: the evaluation device comprises a bracket (2.1), and an annular light source (2.2), a filler (2.3), a high-speed camera (2.4), a liquid inlet pipe (2.5), a motor supporting plate (2.6), a motor (2.7), a rotating shaft (2.8), a balance block (2.9), a rotating disc (2.10) and a rotating disc fastening nut (2.11) which are positioned inside the bracket (2.1); the motor (2.7) is positioned on the motor supporting plate (2.6) and is connected with the rotating disc (2.10) through a rotating shaft (2.8); the annular light source (2.2) is positioned below the rotating disc (2.10); the filler (2.3) and the high-speed camera (2.4) are fixed on one side of the rotating disc (2.10), and the high-speed camera (2.4) is positioned above the filler (2.3); a balance weight (2.9) is arranged on the other side of the rotating disk (2.10) corresponding to the filler (2.3) and the high-speed camera (2.4); the liquid inlet pipe (2.5) is positioned below the motor (2.7) and above the rotating disc (2.10) and extends to the filler (2.3); the rotating shaft (2.8) is connected with the rotating disc (2.10) through a rotating disc fastening nut (2.11); the rotating disc (2.10) is made of transparent materials; the high speed camera is used to track each droplet size and morphology change, which in turn allows the performance of the filler to be evaluated.
2. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the high-speed camera (2.4) is fixed above the rotating disc (2.10) and moves along with the rotating disc (2.10), the high-speed camera (2.4) is located above the filler (2.3), and the lens is perpendicular to the direction of the filler (2.3).
3. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the supergravity level of the rotating disc (2.10) is 10-1000g, and the diameter is 30-3000 mm.
4. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the high-speed camera (2.4) is connected with a computer through a data line, and the computer records the liquid form change after the liquid passes through the filler and the liquid flowing form in the filler in real time.
5. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the rotary disc (2.10) is provided with a fixing frame for fixing the filler (2.3) on the rotary disc (2.10), and the filler (2.3) is detached and replaced through the fixing frame.
6. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the weight of the balance weight (2.9) is matched with the weight of the filler (2.3) and the high-speed camera (2.4) on the other side of the rotating disc (2.10) so as to ensure the balance and stability of the rotating disc (2.10) during rotation.
7. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the liquid inlet pipe (2.5) vertically sprays liquid on one side of the filler (2.3).
8. The apparatus for evaluating the influence of the high-gravity rotating bed packing on the liquid flow according to claim 1, wherein: the filler (2.3) comprises a metal filler, a plastic filler or a foam filler; the motor supporting plate (2.6), the rotating disc (2.10), the liquid inlet pipe (2.5) and the rotating shaft (2.8) are made of stainless steel.
9. Method for evaluating the effect of a high gravity rotating bed packing on the flow of a liquid by means of an evaluation device according to any of claims 1 to 8, comprising the steps of:
fixing the filler to be evaluated on a rotating disc, adjusting the weight of a balance block to keep the rotating disc stable, adjusting the rotating speed of the rotating disc, and keeping the supergravity horizontal range at 10-1000 g; connecting a camera with a computer, and acquiring a real-time image by the computer; and starting a light source and an experimental device power supply, allowing liquid to enter, and storing the liquid form change after the liquid passes through the filler and the liquid flowing form in the filler through a computer.
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| CN201511020741.7A CN106932394B (en) | 2015-12-30 | 2015-12-30 | Device and method for evaluating influence of super-gravity rotating bed filler on liquid flow |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418155A (en) * | 2013-08-05 | 2013-12-04 | 浙江工业大学 | High-gravity rotating packed bed device used for rectification |
| CN103512723A (en) * | 2013-09-30 | 2014-01-15 | 哈尔滨工程大学 | Experiment and measurement system used for pulsating flow state transition visualization research |
| CN104062091A (en) * | 2014-07-08 | 2014-09-24 | 华东理工大学 | Synchronous high-speed photography method and device for particle rotation in liquid swirling flow field |
| CN105080436A (en) * | 2014-05-06 | 2015-11-25 | 北京化工大学 | Ultrasonic coupling supergravity rotary packed bed and application thereof |
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|---|---|---|---|---|
| CN103418155A (en) * | 2013-08-05 | 2013-12-04 | 浙江工业大学 | High-gravity rotating packed bed device used for rectification |
| CN103512723A (en) * | 2013-09-30 | 2014-01-15 | 哈尔滨工程大学 | Experiment and measurement system used for pulsating flow state transition visualization research |
| CN105080436A (en) * | 2014-05-06 | 2015-11-25 | 北京化工大学 | Ultrasonic coupling supergravity rotary packed bed and application thereof |
| CN104062091A (en) * | 2014-07-08 | 2014-09-24 | 华东理工大学 | Synchronous high-speed photography method and device for particle rotation in liquid swirling flow field |
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