CN110201589B - Micro mixer for dispersing liquid drops or bubbles in high-viscosity fluid - Google Patents
Micro mixer for dispersing liquid drops or bubbles in high-viscosity fluid Download PDFInfo
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- CN110201589B CN110201589B CN201910388637.5A CN201910388637A CN110201589B CN 110201589 B CN110201589 B CN 110201589B CN 201910388637 A CN201910388637 A CN 201910388637A CN 110201589 B CN110201589 B CN 110201589B
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- 239000012530 fluid Substances 0.000 title claims abstract description 52
- 239000007788 liquid Substances 0.000 title claims abstract description 21
- 239000006185 dispersion Substances 0.000 claims description 15
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 230000011218 segmentation Effects 0.000 abstract description 2
- 238000003491 array Methods 0.000 abstract 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 229920005549 butyl rubber Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/47—Mixing liquids with liquids; Emulsifying involving high-viscosity liquids, e.g. asphalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/30—Micromixers
- B01F33/301—Micromixers using specific means for arranging the streams to be mixed, e.g. channel geometries or dispositions
- B01F33/3017—Mixing chamber
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
Abstract
The invention belongs to the technical field of chemistry and chemical engineering, and discloses a micro mixer for dispersing liquid drops or bubbles in high-viscosity fluid. The micro mixer forms liquid drops or bubbles through triangular micropore arrays symmetrically arranged on two sides of an internal mixing channel, and then further breaks the liquid drops and the bubbles by utilizing a plate type fluid segmentation channel arranged on the downstream of the mixing channel, so that high-efficiency liquid-liquid or gas-liquid mixing is realized. Aiming at the characteristic of large flow resistance of high-viscosity fluid, the micromixer optimizes the fluid mechanics layout through a regular microstructure, reduces the pressure drop of mixing equipment, and is suitable for a mixing system with the viscosity of less than 500mPa & s.
Description
Technical Field
The invention belongs to the technical field of chemistry and chemical engineering, and particularly relates to a micro mixer for mixing high-viscosity fluid or gas-liquid two-phase fluid.
Background
Heterogeneous mixing processes are important steps in chemical reactions and separations. In a continuous reaction and separation system, passive mixing equipment represented by a static mixer has the characteristics of simplicity in operation, low energy consumption and the like. However, the conventional static mixing apparatus has a complicated internal structure and a large flow resistance to cope with the mixing problem of the high-viscosity fluid, and thus its application is limited. The advent of micro-structured mixers (micromixers) enabled efficient static mixing processes for highly viscous fluids. The micro-structure mixer mainly adopts the principle of micro-scale mixing, divides fluid to be dispersed into micron-sized liquid drops and bubbles through a precisely designed micro-structure array, and has good primary dispersion effect, so that the structure of the equipment is greatly simplified, and the volume of the equipment is greatly reduced.
Currently, the mature micromixers include interdigital micromixers, Corning heart mixers, split-polymerization micromixers, micromesh dispersing mixers, and the like. Although these micromixers have achieved efficient mixing of liquid and gas in many applications, it is difficult to achieve a satisfactory effect of use for highly viscous fluids (>50mPa · s), mainly because the micromixers have a precise internal structure and a narrow flow channel, which limits the achievement of a mixing effect. In order to realize the mixing of highly viscous fluids by the principle of micromixing, it is necessary to maintain the dispersion and transfer dimensions on the order of micrometers on the one hand and to reduce the flow resistance of the fluid on the other hand. Based on the above, the invention provides a micro-mixing device which adopts the combined action of micro-dispersion and re-crushing of liquid drops and bubbles, and the device does not pursue micro-liquid drops and bubbles obtained through one-time dispersion, so that the design of a micro-dispersion structure can be simplified, the pressure drop can be reduced, meanwhile, a fluid segmentation structure is adopted to continuously cut the liquid drops and bubbles at the downstream, and the final high-efficiency dispersion in the mixing process is realized by virtue of the characteristic of strong shearing force of high-viscosity fluid. Due to the mixed use of the dispersion and the crushing, the flow resistance is greatly reduced, and a liquid-liquid and gas-liquid micro-dispersion system with the diameters of liquid drops and air bubbles being less than 1mm can be obtained.
Disclosure of Invention
Based on the scientific principle, the invention aims to develop a micromixer for dispersing liquid drops or bubbles in high-viscosity fluid, and the specific invention content is as follows:
a micromixer for dispersing liquid droplets or bubbles in a highly viscous fluid, which comprises a symmetrical micro-dispersion member 1, a mixing channel 2, a fluid dividing channel 3, a side distribution chamber 4, a main distribution chamber 5, a mixed product collection chamber 6, a side feed pipe 7, a main feed pipe 8 and a discharge pipe 9, and is characterized in that:
1) the symmetrical micro-dispersion parts 1 are symmetrically arranged at two sides of the mixing channel 2 and are plate type mechanical parts containing triangular through holes, the triangular through holes are distributed by adopting a square array 10 or a staggered array 11, the outer contours of the triangular through holes are isosceles triangles, the vertex angles face the flowing direction of fluid in the mixing channel, the range of the vertex angles is 30-70 degrees, and the height of the triangle is 0.5-1.5 mm;
2) the fluid dividing channel 3 is arranged at the downstream of the mixing channel 2 and is directly communicated with the mixing channel 2, the interior of the fluid dividing channel is of a multilayer baffle 12 structure, the thickness of the baffles is 0.5-2mm, the length of the baffles is 5-10mm, the distance between the baffles is 1-3mm, the baffles are arranged alternately, and the upper side and the lower side of each baffle are connected with the wall surface of the fluid dividing channel.
3) The micro-dispersion member 1 is connected to a fluid-side distribution chamber 4, the fluid-side distribution chamber 4 being further connected to a side feed conduit 7; a main feed conduit 8, a main distribution chamber 5, a mixing channel 2, and connecting in series the fluid dividing channel 3, the mixed product collection chamber 6, and a discharge conduit 9;
the micro mixer at least comprises a mixing channel and a fluid dividing channel; the width of the mixing channel 2 is 1-10mm, and the ratio of the height to the width is 0.2-1; the width of the fluid dividing channel 3 is 2-20mm, and the ratio of the height to the width is 0.3-1; the main feed pipe 8 in the micro mixer is filled with fluid with the maximum viscosity of less than 500 mPa.s, the liquid or gas to be dispersed enters the mixer from the side feed pipe 7, and the mixed product leaves from the outlet pipe 9.
The invention has the beneficial effects that: aiming at the characteristic of large flow resistance of high-viscosity fluid, the micromixer optimizes the fluid mechanics layout through a regular microstructure, reduces the pressure drop of mixing equipment, is suitable for a mixing system with the viscosity of less than 500mPa & s, and realizes the rapid and uniform mixing of high-viscosity heterogeneous fluid under the condition of low flow resistance.
Drawings
Fig. 1 is a schematic diagram of the structure of a micro mixer according to the present invention.
Fig. 2 is a schematic structural view of a symmetric micro-dispersion member and a baffle plate in a micro-mixer of the present invention.
In the figure: 1-symmetrical micro-dispersion part, 2-mixing channel, 3-fluid dividing channel, 4-side distribution chamber, 5-main distribution chamber, 6-mixed product collection chamber, 7-side feeding pipeline, 8-main feeding pipeline, 9-discharging pipeline, 10-square array, 11-staggered array and 12-baffle.
Detailed Description
The invention is further illustrated by the following figures and examples, without thereby limiting the scope of protection of the invention.
A normal hexane solution of butyl rubber or a polyvinyl alcohol aqueous solution is used as a continuous phase fluid, and water or air is used as a dispersed phase fluid, and the continuous phase fluid and the dispersed phase fluid are mixed by a micro mixer shown in the figure 1. The specific process is that continuous phase fluid is injected into a main feeding pipeline 8, dispersed phase fluid is injected into a side feeding pipeline 7, a mixed product flows out from a discharging pipeline 9, the mixed product is collected and photographed through a microscope, and the diameters of obtained liquid drops and bubbles are counted.
Example 1:
a solution of butyl rubber in n-hexane (viscosity 153 mPas) was used as the continuous phase, water as the dispersed phase, the continuous phase flow rate was 0.5L/h, and the dispersed phase flow rate was 0.1L/h. The internal structure of the micro mixer is that the micro mixer comprises 1 mixing channel with width of 1mm and height of 1mm, 1 fluid dividing channel with width of 2mm and height of 2 mm: two sides of the mixing channel contain 1 group of 3x3 square layout triangular through holes with the height of 0.5mm and the apex angle of 30 degrees; the dividing channel contains 1 group of baffles with the thickness of 0.5mm, the length of 10mm and the interval of 1.2 mm. The average diameter of the micro-droplets at the outlet of the mixer is measured to be 0.77mm, and the average flow resistance of the mixer is measured to be 0.11 MPa.
Example 2:
a solution of butyl rubber in n-hexane (viscosity 153 mPas) was used as the continuous phase, water as the dispersed phase, the continuous phase flow rate was 1L/h, and the dispersed phase flow rate was 0.4L/h. The internal structure of the micro mixer is that the micro mixer comprises 3 mixing channels with width of 1mm and height of 0.5mm, and 1 fluid dividing channel with width of 4mm and height of 2 mm: two sides of the mixing channel contain 1 group of 3x3 square layout triangular through holes with the height of 0.5mm and the apex angle of 30 degrees; the dividing channel contains 3 groups of baffles with the thickness of 0.5mm, the length of 10mm and the interval of 1 mm. The average diameter of the micro-droplets at the outlet of the mixer is 0.65mm and the average flow resistance of the mixer is 0.15 MPa.
Example 3:
a n-hexane solution of butyl rubber (viscosity: 297 mPas) was used as a continuous phase, water as a dispersed phase, a continuous phase flow rate of 3L/h, and a dispersed phase flow rate of 1L/h. The internal structure of the micro mixer is that the micro mixer comprises 1 mixing channel with the width of 10mm and the height of 2mm, and 1 flow dividing channel with the width of 20mm and the height of 6 mm: two sides of the mixing channel contain 1 group of 4x3 square layout triangular through holes with the height of 1mm and the apex angle of 48 degrees; the dividing channel contains 10 groups of baffles with the thickness of 1mm, the length of 5mm and the interval of 3 mm. The average diameter of the micro-droplets at the outlet of the mixer is measured to be 0.39mm, and the average flow resistance of the mixer is measured to be 0.21 MPa.
Example 4:
an aqueous solution of polyvinyl alcohol (viscosity: 459 mPas) was used as a continuous phase, air as a dispersed phase, and the continuous phase flow rate was 1.3L/h and the dispersed phase flow rate was 1.2L/h. The internal structure of the micro mixer is that the micro mixer comprises 2 mixing channels with width of 8mm and height of 4mm, and 1 fluid dividing channel with width of 20mm and height of 6 mm: both sides of the mixing channel contain 3 groups of 2/3 triangular through holes with the height of 1.5mm and the vertex angle of 70 degrees; the dividing channel contains 5 groups of baffles with the thickness of 1.5mm, the length of 5mm and the distance of 3 mm. The average diameter of microbubbles at the outlet of the mixer is measured to be 0.92mm, and the average flow resistance of the mixer is measured to be 0.41 MPa.
Example 5:
an aqueous solution of polyvinyl alcohol (viscosity: 459 mPas) was used as a continuous phase, air as a dispersed phase, and the continuous phase flow rate was 2L/h and the dispersed phase flow rate was 1.2L/h. The internal structure of the micro mixer is that the micro mixer comprises 2 mixing channels with the width of 10mm and the height of 5mm, and 2 fluid dividing channels with the width of 10mm and the height of 10 mm: two sides of the mixing channel contain 2 groups of 2/3 triangular through holes with the height of 1.0mm and the vertex angle of 70 degrees; the dividing channel contains 5 groups of baffles with the thickness of 1.0mm, the length of 5mm and the distance of 3 mm. The average diameter of microbubbles at the outlet of the mixer is 0.78mm and the average flow resistance of the mixer is 0.36 MPa.
The above embodiments describe the technical solutions of the present invention in detail. It will be clear that the invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various changes, but any changes equivalent or similar to the present invention are within the protection scope of the present invention.
Claims (3)
1. A micromixer for dispersing droplets or bubbles in highly viscous fluids, characterized in that it comprises symmetrical micro-dispersing elements (1), mixing channels (2), fluid dividing channels (3), side distribution chambers (4), a main distribution chamber (5), a mixed product collection chamber (6), side inlet ducts (7), main inlet ducts (8) and outlet ducts (9), the highly viscous fluids being fluids with a maximum viscosity <500mPa · s, the specific features being:
1) the symmetrical micro-dispersion parts (1) are symmetrically arranged on two sides of the mixing channel (2) and are plate type mechanical parts containing triangular through holes, the triangular through holes are distributed in a square array (10) or a staggered array (11), the outline of each triangular through hole is an isosceles triangle, the vertex angle of each triangular through hole faces to the flowing direction of fluid in the mixing channel, the vertex angle range is 30-70 degrees, and the height of each triangle is 0.5-1.5 mm;
2) the fluid dividing channel (3) is arranged at the downstream of the mixing channel (2) and is directly communicated with the mixing channel (2), the interior of the fluid dividing channel is of a multilayer baffle plate (12) structure, the thickness of the baffle plate is 0.5-2mm, the length of the baffle plate is 5-10mm, the distance between the baffle plates is 1-3mm, the baffle plates are alternately arranged, and the upper side and the lower side of each baffle plate are connected with the wall surface of the fluid dividing channel; the width of the fluid dividing channel (3) is 2-20mm, and the ratio of the height to the width is 0.3-1;
3) the symmetrical micro-dispersion part (1) is connected with a side distribution chamber (4), and the side distribution chamber (4) is further connected with a side feeding pipeline (7); a main feed conduit (8), a main distribution chamber (5), a mixing channel (2), and a fluid dividing channel (3), a mixed product collection chamber (6), and a discharge conduit (9) connected in series.
2. A micromixer in accordance with claim 1, wherein said micromixer comprises at least one mixing channel and one flow splitting channel; the width of the mixing channel (2) is 1-10mm, and the ratio of the height to the width is 0.2-1; the width of the fluid dividing channel (3) is 2-20mm, and the ratio of the height to the width is 0.3-1.
3. Micromixer according to claim 1, characterized in that the liquid or gas to be dispersed enters the mixer from a side feed line (7) and the mixed product exits from a discharge line (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910388637.5A CN110201589B (en) | 2019-05-10 | 2019-05-10 | Micro mixer for dispersing liquid drops or bubbles in high-viscosity fluid |
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| WO2022056814A1 (en) * | 2020-09-18 | 2022-03-24 | 清华大学 | Micro-mixer used for mixing highly viscous fluid or gas/liquid two-phase fluid |
| CN112495300B (en) * | 2020-11-10 | 2022-02-01 | 清华大学 | Micro-nozzle array film and micro-droplet generating device |
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