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A Microchannel Device Forming a Stable Annular Flow

A kind of annular flow, micro-channel technology, applied in chemical/physical/physical chemical process, liquid solution solvent extraction, chemical instruments and methods, etc., can solve two-phase interface instability, affect two-phase separation, small material flow, etc. To achieve the effect of broadening the two-phase flow rate and flow ratio range, improving the service life, and enhancing the mass transfer rate

Active Publication Date: 2020-12-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other flow patterns, annular flow has a larger flow ratio range of two-phase fluid when it is formed, so it has a wider application range. However, the two-phase interface of annular flow formed by existing microchannel devices is not stable, and there are random fluctuations phenomenon, and the fluctuation amplitude increases with the increase of the fluid flow rate, resulting in that the two-phase fluid cannot be separated immediately when the two-phase fluid flows out of the microchannel; when the two-phase flow ratio exceeds a certain value, the inner ring phase will be sheared into dispersed droplets, The two-phase fluid no longer flows in a bicontinuous phase, affecting the separation of the two phases
[0003] In addition, common microchannel devices are often unable to withstand high pressures, process low material flow rates, and are easily damaged by corrosion

Method used

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  • A Microchannel Device Forming a Stable Annular Flow
  • A Microchannel Device Forming a Stable Annular Flow
  • A Microchannel Device Forming a Stable Annular Flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The microchannel device forming stable annular flow in this embodiment is as figure 1 , figure 2 , image 3 As shown, by the base 11, the first diversion guide fixture 3, the second diversion guide fixture 6, the first inner tube 4-1, the second inner tube 4-2, the outer tube 5, the linear center insert 1, the spring 8, The first bracket 9 , the guide rail 13 , the second bracket 10 and the fixing bolt 12 are composed.

[0041] The outer tube 5 is a quartz glass tube with an outer diameter of 3.0 mm, an inner diameter of 1.5 mm, and a length of 150 mm. The first inner tube 4-1 and the second inner tube 4-2 are 316L stainless steel tubes with an outer diameter of 0.7 mm. mm and inner diameter are both 0.5mm, the gap between the outer wall of the first inner tube and the inner wall of the outer tube and the gap between the outer wall of the second inner tube and the inner wall of the outer tube are both 0.4mm, and the linear center insert 1 is Figure 11 A nylon wire ...

Embodiment 2

[0046] In this example, deionized water is used as the water phase, and toluene dyed with Sudan Red III is used as the organic phase to verify the microchannel device for forming a stable annular flow described in Example 1.

[0047] This embodiment is carried out at a room temperature of 25°C. Through the syringe pump and the syringe installed on the syringe pump, the water phase forming the outer ring passes through the first liquid inlet 2, the first liquid inlet 3-12, The first outer ring fluid storage tank 3-11, the left end of the outer tube 5 enters the microchannel, after the fluid forming the outer ring is filled with the microchannel, then the organic phase forming the inner ring passes through the second liquid inlet at a flow rate of 2 mL / min 14. The second liquid inlet hole 3-13, the first inner ring fluid storage tank 3-10, and the first inner tube 4-1 are input into the microchannel, and in the microchannel, the organic phase fluid 17 surrounds the linear central...

Embodiment 3

[0049] The microchannel device forming stable annular flow among the present embodiment is identical with embodiment 1, as figure 1 , figure 2 , image 3 As shown, by the base 11, the first diversion guide fixture 3, the second diversion guide fixture 6, the first inner tube 4-1, the second inner tube 4-2, the outer tube 5, the linear center insert 1, the spring 8, The first bracket 9 , the guide rail 13 , the second bracket 10 and the fixing bolt 12 are composed. The first shunt guide fixture 3 is as Figure 4 As shown, the second shunt guide fixture 6 is as Figure 5 Shown, is identical with embodiment 1.

[0050] The difference from Embodiment 1 is that the outer diameter of the outer tube 5 is 3.0 mm, the inner diameter is 0.9 mm, and the length is 150 mm, and the gap between the outer wall of the inner tube and the inner wall of the outer tube is 0.1 mm.

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Abstract

The invention provides a microchannel device capable of forming stable annular flow. The microchannel device capable of forming the stable annular flow comprises a base, a first flow dividing guide clamp, a second flow dividing guide clamp, a first inner tube, a second inner tube, an outer tube, a linear central inserting piece, a first bracket, a guide rail and a second bracket. When the linear central inserting piece is made of lipophilic material, the outer tube is made of hydrophilic material, and when the linear central plug-in is made of hydrophilic material, the outer tube is made of lipophilic materials. Experiments show that by using the microchannel device, liquid-liquid two-phase fluid forms the stable annular flow in the wide flow rate and flow rate ratio range, and phase separation can be realized immediately when the annular flow flows out of the microchannel; and if the linear central inserting piece with regularly changed contour is selected, the stable annular flow with regular deformation can be formed, secondary circulating flow is generated in the fluid, and the mass transfer process is effectively strengthened.

Description

technical field [0001] The invention belongs to the field of microchemical equipment, in particular to a microchannel device capable of forming a stable annular flow. Background technique [0002] Microchannel devices are widely used in liquid-liquid extraction, and research on the liquid-liquid two-phase flow pattern in microchannels has attracted much attention, because the flow pattern will significantly affect the mass transfer rate and the phase separation of the outlet fluid. The study of two-phase fluid in microchannels shows that liquid-liquid two-phase fluid in microchannels can form a series of flow patterns such as slug flow, drop flow, parallel flow and annular flow. Compared with other flow patterns, annular flow has a larger flow ratio range of two-phase fluid when it is formed, so it has a wider application range. However, the two-phase interface of annular flow formed by existing microchannel devices is not stable, and there are random fluctuations phenomeno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04B01J19/00
Inventor 金央邹达焦辉燕李军李维范钲威陈斯渝陈明
Owner SICHUAN UNIV