3D numerical simulation on fluid flow and heat transfer characteristics in multistage heat exchanger with slit fins |
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Authors: | W Q Tao Y P Cheng T S Lee |
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Institution: | (1) State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China;(2) Laboratory of Fluid Mechanics, Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore, 119260 |
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Abstract: | In this paper, a numerical investigation is performed for three-stage heat exchangers with plain plate fins and slit fins
respectively, with a three-dimensional laminar conjugated model. The tubes are arranged in a staggered way, and heat conduction
in fins is considered. In order to save the computer resource and speed up the numerical simulation, the numerical modeling
is carried out stage by stage. In order to avoid the large pressure drop penalty in enhancing heat transfer, a slit fin is
presented with the strip arrangement of “front coarse and rear dense” along the flow direction. The numerical simulation shows
that, compared to the plain plate fin heat exchanger, the increase in the heat transfer in the slit fin heat exchanger is
higher than that of the pressure drop, which proves the excellent performance of this slit fin. The fluid flow and heat transfer
performance along the stages is also provided. |
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Keywords: | |
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