Abstract
A numerical study has been conducted to clarify the flow and heat transfer characteristics of a cross-flow heat exchanger with drop-shaped tubes (6-rows of single/double tubes) at zero angle of attack. The study is performed for the Reynolds number Re a = 1.38x103 ∼ 9.36 x103.A mathematical and numerical model in software packageANSYS for numerical evaluation of heat transfer and flow field of a bundle of drop-shaped tubes, with taking into account the strain caused by different pressures inside and outside the tubeshas been developed. Correlations of the average Nusselt number Nu av and a friction factor f in terms of Re D,max and Pr for the studied bundles were presented. The result of the numerical simulation indicates the pressure drop coefficient of the studied drop-shaped tube bundles is about 9.86 ∼ 10.88 times smaller than the circular one.
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