Abstract
Abstract: A series of numerical simulation of the flow and heat transfer in modeled counter-flow heat exchangers with oblique wavy walls is made for optimal shape design of recuperators. The effects of oblique angles and height amplitudes of the wavy walls are systematically examined, and the heat transfer and pressure loss characteristics are investigated. Strong secondary flow is generated by counter-rotating streamwise vortices, which make the flow field highly asymmetric in the spanwise direction. With the oblique angle of 50-60 degree, significant heat transfer enhancement is achieved with relatively-small pressure loss penalty, and the j/f factor becomes significantly larger than that of straight square duct. When thermal coupling of hot and cold fluid passages is considered, the heat transfer is found to be strongly dependent on the arrangement of the passages. It is also found that the j/f factor is increased with the Reynolds number in the range of the present study.
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