Numerical study on the flow distribution uniformity in angled and curved manifolds

Sohzabi, Farzane Najari; Amiri, Elham Omidbakhsh

doi:10.1007/s00542-017-3572-9

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Besides comparing the fluid uniformity visually via simulation contours, it was also analysed numerically using the relative standard deviation (RSD). This parameter has been widely applied in multiple studies to measure the percentage deviation in a given set of samples, [23][24][25] which in this study would be the uniformity of mass flow rate distribution. The formula is shown in Equation ( 2).…”

Section: Resultsmentioning

confidence: 99%

“…It can be applied first by recording the total number of channels and the flow rate per channel. The reference journals by Pan et al and Sohzabi et al 23,24 used velocity as the flow rate unit, but the current paper uses mass flow rate to quantify the amount of air passing through the channels per unit time, as done by Yu et al 25 This is followed by calculating the mean mass flow rate in each model. These values can then be inserted as per Equation (2) for calculation, where a smaller RSD value indicates better fluid uniformity due to a lower percentage deviation.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of fluid flow behaviour in different proton exchange membrane fuel cell flow field configurations

Sarjuni,

Lim,

Majlan

et al. 2023

Asia-Pacific J Chem Eng

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The performance of a proton exchange membrane fuel cell (PEMFC) stack is largely affected by the bipolar plate design. Uniform gas distribution throughout the active area with effective mass transport is critical to avoiding activation, concentration and ohmic losses that can reduce the overall stack performance. In this study, three inlet/outlet turning angles (90, 135 and 180°) were first simulated with a conventional parallel (CP) flow field. It was found that the 135° inlet/outlet angle showed the most optimised fluid distribution in the flow field. Thus, improving fluid uniformity up to 6% and reducing pressure drop up to 36%. This turning angle was then simulated in three different flow fields (modified serpentine [MS], modified fishbone [MF] and Tesla valve [TV]). MF generated the lowest pressure drop value of 80.11 Pa, but flow channelling was apparent in the fluid channels. The pressure drop in MS was 43% higher than in TV. Furthermore, the continuous fluid flow mechanism of the TV design generated up to two times higher uniformity level than MS. Hence, a TV flow field with a 135° inlet/outlet angle evidently demonstrated uniform fluid distribution, which can significantly enhance the multi‐phase fluid dynamics in a PEMFC.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Analysis of fluid flow behaviour in different proton exchange membrane fuel cell flow field configurations

Sarjuni,

Lim,

Majlan

et al. 2023

Asia-Pacific J Chem Eng

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show abstract

“…Most of the research on flow distribution between cells focuses on numerical simulation, which is mainly related to the influence of the structure parameters and operating parameters of manifolds on flow distribution in the stack . Research on the experimental methods of measuring the flow distribution between cells is relatively rare.…”

Section: Specific Conditions Of the Testmentioning

confidence: 99%

An Experimental Method to Measure Flow Distribution in the Cathode of High‐Temperature Polymer Electrolyte Membrane Fuel Cells Stack

Yang

et al. 2019

Energy Tech

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The flow distribution in manifolds has an important influence on the performance and life of the stack, but currently the methods to measure the cathode flow distribution between cells in a high‐temperature polymer electrolyte membrane fuel cells (HT‐PEMFC) stack is scarce. Herein, an experimental method for measuring the cathode flow distribution between cells is developed, which converts the cathode flow (Q) signal into a signal of hydrogen limiting current (iL). By dimensional analysis and experimental verification, it is found that iL and Q have a linear relationship within a certain range. In the HT‐PEMFC single cell, the method can be used to quickly evaluate and screen the cathode diffusion layer. When used in the HT‐PEMFC stack, the effect of temperature is negligible, but it is necessary to ensure the same compression ratio of each cell, whereas the iL of each cell is tested simultaneously in the stack. In addition, the method is limited to measure flow distribution between cells in the stack because the iL value is averaged.

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“…15 investigated the flow uniformity in microchannel with U-type collector shape and propose the dumbbell shape collector to reduce stagnation zone and the growth of boundary layer along the collector wall. Sohzabi and Amiri 16 investigated flow maldistribution in triangular header shape designs with straight, concave and convex inlet manifold (of angle 30°, 45° and 60°) with two outlets, and trapezoidal manifold structures. They found that A30 with convex shape and two outlets have the least dead volume space.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of simple radial fin design for single phase liquid flow in microchannel heat sink

Qidwai

Hasan

Khan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper numerically investigates heat transfer performance and characteristics in single-phase liquid cooling in microchannels with radial arrangement of fins having inherent symmetry to mitigate the problem of flow maldistribution. The effects of number of fins, channel depth and flow rate on Nusselt number and substrate temperature are obtained. The relative thermal performance and overall efficiency are compared with respect to two different base cases having minimum number of channels and minimum channel depth. For increasing values of flow rate and channel depth, contradicting effects in terms of temperature uniformity are obtained. By varying only number of channels, has no significance until it is coupled with channel depth, which suggests that aspect ratio of inlet cross-sectional area should be considered as a significant factor which is capable of generating secondary flows in single phase liquid flows. The overall efficiency of case with 70 number of channels, 200 µm depth and 15 ml/min is found to be highest.

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Numerical study on the flow distribution uniformity in angled and curved manifolds

Cited by 10 publications

References 9 publications

Analysis of fluid flow behaviour in different proton exchange membrane fuel cell flow field configurations

Analysis of fluid flow behaviour in different proton exchange membrane fuel cell flow field configurations

An Experimental Method to Measure Flow Distribution in the Cathode of High‐Temperature Polymer Electrolyte Membrane Fuel Cells Stack

Performance evaluation of simple radial fin design for single phase liquid flow in microchannel heat sink

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