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Microchannel reactor for enhacing multiphase flow heat and mass transfer in microchannel

A technology of microchannel reactor and microchannel, which is applied in chemical/physical/physicochemical reactors, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that fluid movement state is difficult to achieve precise control, and achieve improvement Effects of heat and mass transfer performance, increased contact area, and increased velocity pulsation intensity

Active Publication Date: 2020-02-07
南京长江工业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the introduction of additional energy into the microreactor, and it is difficult to accurately control the motion state of the fluid under the action of ultrasound of different frequencies and powers.

Method used

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  • Microchannel reactor for enhacing multiphase flow heat and mass transfer in microchannel
  • Microchannel reactor for enhacing multiphase flow heat and mass transfer in microchannel
  • Microchannel reactor for enhacing multiphase flow heat and mass transfer in microchannel

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Experimental program
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Effect test

Embodiment 1

[0050] Embodiment one: the upper coating is a hydrophobic coating, the contact angle of the hydrophobic coating is A1, the lower coating is a hydrophilic coating, and the contact angle of the hydrophilic coating is A2, The value range of A1 is 90 o -150 o , the value range of A2 is 30 o -90 o , and A1-A2o .

[0051] When the upper coating is a hydrophobic coating and the lower coating is a hydrophilic coating, the distribution of the contact angle is as follows: Figure 2a As shown, the multiphase flow manifolds under different combinations of upper and lower wall surface contact angles can be mainly divided into three types: slug flow, transition flow and stratified flow. The results are as follows Figure 2b (The figure also shows a schematic diagram of the shape changes of the bubbles at the three numerical points as indicated by the arrows). Among them, in the transitional flow and stratified flow, the separated bubbles will re-aggregate, thereby reducing the contact ...

Embodiment 2

[0054] Embodiment 2: The mixing channel is sequentially divided into a formation zone, a transition zone and a stable zone from the side where the liquid channel is located; wherein the formation zone and the transition zone are both 900 meters long. μm .

[0055] The upper coating is a hydrophobic coating, and the lower coating is a hydrophilic coating;

[0056] The contact angles of the hydrophobic coating in the formation zone are B1, and the contact angles of the hydrophilic coating are B2; the contact angles of the hydrophobic coating in the stable zone are B3, and the contact angles of the hydrophilic coating are B4;

[0057] The value range of B1 is 90 o -150 o , the value range of B2 is 30 o -90 o ;B3=B4=90 o ;

[0058] The contact angle of the hydrophobic coating in the transition zone varies linearly from B1-B3, and the contact angle of the hydrophilic coating in the transition zone varies linearly from B2-B4.

[0059] In this embodiment, the distribution of ...

Embodiment 3

[0060] Embodiment 3: The upper coating is composed of hydrophobic coating and hydrophilic coating alternately, and is firstly hydrophobic coating from the side where the liquid channel is located;

[0061] The undercoat layer is composed of hydrophobic coatings and hydrophilic coatings alternately, and is firstly a hydrophilic coating from the side where the liquid channel is located;

[0062] The contact angle of the hydrophobic coating in the upper coating and the lower coating is C1, the contact angle of the hydrophilic coating in the upper coating and the lower coating is C2, and the value range of C1 is 90 o -150 o , the value range of C2 is 30 o -90 o , and C1-C2o .

[0063] In this embodiment, the upper and lower walls of the microchannel are divided into 7 equally spaced subsections, each of which is twice the length of the channel width, and each subsection is respectively set as a hydrophilic or hydrophobic coating in an alternately changing form to ensure that th...

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Abstract

The invention provides a microchannel reactor for enhancing multiphase flow heat and mass transfer in a microchannel, and relates to the field of microchannel reactor structures. The microchannel reactor for enhancing multiphase flow heat and mass transfer in the microchannel provided by the invention is wide in application range, does not need additional energy input and can enhance the performance of multiphase flow heat and mass transfer in the microchannel. The reactor comprises a first medium channel, a second medium channel and a mixing channel, wherein the first medium channel and the second medium channel both communicates with a same side of the mixing channel; an upper coating is smeared on the upper wall surface of the mixing channel; and the lower wall surface of the mixing channel is coated with a lower coating. The first medium channel is a gas channel, and the second medium channel is a liquid channel. By reasonably controlling the distribution of the contact angles of ahydrophobic coating and a hydrophilic coating in the upper coating and the lower coating, on one hand, the efficiency of chemical reaction and heat exchange among different fluids is improved; and onthe other hand, mutual mixing among the fluids is enhanced, and heat and mass transfer performance is further improved.

Description

technical field [0001] The invention relates to the field of microchannel reactor structure. Background technique [0002] Microchannel structures mainly exist in devices with internal feature sizes on the scale of several micrometers to several millimeters. Compared with traditional large-scale industrial equipment, microchannel reactors have good application prospects in highly integrated microelectronic equipment, chemical, biological and other industries due to their compact structure, large specific surface area, and high heat and mass transfer efficiency. . [0003] However, the development of microchannel reactor technology also presents some new problems that need to be solved urgently. Due to the small size of the microchannel, the flow is usually in a laminar state and the effect of surface tension is significant, which reduces the mixing intensity and heat exchange efficiency of the fluid in the microchannel. At present, the commonly used method is to design th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00
CPCB01J19/0093
Inventor 张童伟林星箭吴杰
Owner 南京长江工业技术研究院有限公司
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