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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

A Numerical Study of Fluid and Heat Transfer Performance of Heat Exchangers with Novel Short-Circuit Prevention Helical Baffles

Get access (open in a dialog) DOI: 10.1615/IHTC15.hte.008750
pages 3997-4006

Résumé

Three physical models of short-circuit prevention helical baffled heat exchanger (HBHE) are built in this paper. The corresponding numerical simulations are performed on HBHE by software ANSYS CFX. The influence of short-circuit prevention plates on flow and heat transfer and resistance performance are investigated under different helical angle (10°, 25°, 40°) and different working conditions, and comparison is made between the novels and the conventional HBHE. Analyses of numerical results indicate that at relative small helical angel, short-circuit prevention HBHE shows relatively better fluid flow performance because the leakage flow in the triangle area is reduced and the uniformity of velocity distribution and stability of flow are improved, meanwhile the comprehensive heat transfer performance of short-circuit prevention HBHE is better than that of conventional HBHE. At relative large helical angel, the widened section of short-circuit prevention baffle has less diversion function on flow, and the difference of velocity distribution and resistance loss between the two plates becomes smaller, meanwhile the comprehensive heat transfer performance of short-circuit prevention HBHE is less than that of conventional HBHE with the same working condition. Therefore, shortcircuit prevention helical baffles is not suitable at a relatively larger helix angle. Related conclusions in this paper are useful for the selection of helical baffles shapes when people are faced with this issue.