| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 688016 | Chemical Engineering and Processing: Process Intensification | 2015 | 9 Pages |
•Flow distribution in a Z-type ladder network with 10 mini-channels is studied.•A stairway shape and a tapered shape distributor/collector are tested and compared.•Uniform flow distribution may be reached under very low flow-rate conditions.•Larger inclined angle or fewer channels are favorable for more uniform distribution.
Parallel micro or mini-channels are widely used in various devices of process and energy engineering including micro-reactors, compact heat exchangers and fuel cells. Nevertheless, the flow maldistribution due to the improper design of distributor/collector is usually observed, leading to globally poor performances of these devices. The objective of this study is to optimize the shape of the distributor/collector pipes so as to achieve a uniform flow distribution among an array of parallel mini-channels. A Z-type ladder fluid network with 10 mini-channels in parallel having square section is introduced and investigated. Two methods are used to optimize the shape of distributor/collector pipes: an optimized discrete stairway shape and a continuous tapered shape with an inclined angle varying from 0° to 30°. 3D-CFD simulations are carried out using the ANSYS FLUENT code. Numerical results obtained show that a relatively uniform flow distribution may be reached by the discrete stairway shape or by the continuous tapered shape distributor/collector under very low flow-rate conditions. Larger inclined angle or fewer channels in parallel are favorable for more uniform flow distribution under higher flow-rate conditions. Nevertheless the distributor and the collector pipes occupy a large volume so that the entire device is less compact.
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