http://mamalighashang.persiangig.com/1-s2.0-S0360319912017065-main.pdf

Influence of geometric parameters of the flow fields on the performance of a PEM fuel cell. A review

https://hal.archives-ouvertes.fr/hal-00498952/document

A general review of the Wilson plot method and its modifications to determine convection coefficients in heat exchange devices

This paper gives a review on performances of compact heat exchangers (CHEs), including well-established devices, some relative newcomers to the market and also designs still being tested in the laboratory. The structures of the CHEs are briefly introduced, and their heat transfer enhancement mechanisms, as well as their advantages and limitations, are summarized. Then, different heat transfer enhancement technologies in CHEs are compared and their thermo-hydraulic performances are analyzed on the basis of available correlations for heat transfer and friction factor developed by various investigators quoted in the open literature. Finally, the technologies that may fit the specifications for a new generation of solar receiver, which is a critical component of the Concentrated Solar Power (CSP) system, are proposed. It is concluded, among others in the review, that solar receivers based upon CHE technology have been rarely reported, and therefore, more work is needed in this field for a comprehensive understanding and to improve the uses of new energy sources and contribute to sustainability.

Compact heat exchangers: A review and future applications for a new generation of high temperature solar receivers

Theory and practice of flow field designs for fuel cell scaling-up: A critical review

Pressure drop and flow distribution in parallel-channel configurations of fuel cells: U-type arrangement

Plate heat exchangers are making their presence felt in the power and process industry in the recent past. Hence, it has become necessary to model their temperature response accurately. The traditional way of modelling a plate heat exchanger with equal flow in all the channels is unrealistic, and previous studies indicate that considerable differences remain in the flow rates in different channels. The present work brings out the effect of flow maldistribution from channel to channel comprehensively. This poses a serious question about the usual method of analysis of the experimental heat-transfer data of the plate heat exchanger. Unlike previous studies, the present study indicates the importance of considering the heat-transfer coefficient inside the channels as a function of flow rate through that particular channel. This eliminates the contradictory proposition of unequal flow rates but an equal heat-transfer coefficient. A wide range of parametric study have been presented, which brings out effects such as those of the heat-capacity rate ratio, flow configuration, number of channels and correlation of heat transfer. The analysis presented here suggests a better method of heat-transfer data analysis for plate heat exchangers.

Effect of flow distribution to the channels on the thermal performance of a plate heat exchanger

A detailed experimental study on flow maldistribution from port to channel of a plate heat exchanger is presented. In general, flow maldistribution brings about an increase in pressure drop across the heat exchanger

An Experimental Study on the Influence of Flow Maldistribution on the Pressure Drop Across a Plate Heat Exchanger

An experimental and theoretical study of the effect of flow maldistribution from port to channel on the thermal performance of single and multipass plate heat exchangers is presented. In general, flow maldistribution brings about an increase in pressure drop and decrease of the thermal performance in heat exchangers. This deterioration is found to depend on flow rate, number of channels, and port size. Experiments show that analytical predictions of pressure drop and thermal performance in presence of flow maldistribution are quite accurate for practical purposes. The results indicate that under identical conditions, maldistribution is more severe in Z-type plate heat exchanger compared to U type. Multipassing is found to reduce the maldistribution effect significantly. An insight to the physical aspects of maldistribution and its possible reduction through proper design strategy are also presented. (Less)

An experimental and theoretical investigation of the effect of flow maldistribution on the thermal performance of plate heat exchangers

Transient response of plate heat exchangers considering effect of flow maldistribution

The flow of fuel and oxidant through a PEMFC is analyzed for prediction of maldistribution Flow distribution of both fuel and oxidant from the port to the individual cells critically control the performance of a PEMFC stack in combination The distribution of fluids was simulated by analytical approach utilizing flow channeling model of a manifold A detailed numerical modeling is also carried out considering flow in each cell between the electrodes as flow through an equivalent porous medium offering identical resistance The results show a close match between the analytical and numerical results The parametric study reveals that flow rate and port size plays major role determining maldistribution of the fluids, which can be considerably skewed when large numbers of cells are stacked for larger power output

B. Prabhakara Rao

Papers

Effect of flow distribution to the channels on the thermal performance of a plate heat exchanger

An Experimental Study on the Influence of Flow Maldistribution on the Pressure Drop Across a Plate Heat Exchanger

An experimental and theoretical investigation of the effect of flow maldistribution on the thermal performance of plate heat exchangers

Transient response of plate heat exchangers considering effect of flow maldistribution

Analysis of Flow Maldistribution of Fuel and Oxidant in a PEMFC