A study on flow heat transfer characteristics of side-by-side double heat exchanger tubes under nonlinear acoustic streaming

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (24) : 160-168.

YANG Yanfeng1,2,YANG Yang1,LIU Liang1,XIN Feng1

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Abstract

In order to study the flow and heat transfer caused by time-averaged nonlinear acoustic streaming under the action of strong sound waves, a numerical model of nonlinear acoustic streaming coupled non-uniform temperature field around a side-by-side double heat exchanger tube was established. The Reynolds stress method was used to calculate the effects of nonlinear acoustic streaming on the temperature field and heat transfer coefficient around the tube bundle under different sound frequencies (20~2000 Hz) and sound pressure levels (123.31-140.21 dB). The results show that the distortion nonlinear acoustic streaming effect formed by high intensity sound has a significant modulating effect on the flow and heat transfer process of the heat exchanger tube bundle. The average Nusselt number of the heat exchanger tube decreases and increases exponentially with the increase of sound frequency and sound pressure level, respectively. The nonlinear acoustic streaming vortex in the gap region of the tube bundle has a heat-trapping effect, so the average Nusselt number is small, and the local Nusselt number in the gap area of the tube bundle always has a "U" distribution. Compared with high-frequency strong sound, the nonlinear acoustic streaming effect produced by 20 Hz and 140.21dB low-frequency strong sound has a more significant heat transfer enhancement effect, and the average Nusselt number is 2 times higher than 1000 Hz and 2.37 times higher than 123.31 dB.

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nonlinear acoustic streaming / side-by-side double heat exchanger tube / heat transfer / strong sound wave / Reynolds stress method

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YANG Yanfeng1,2,YANG Yang1,LIU Liang1,XIN Feng1. A study on flow heat transfer characteristics of side-by-side double heat exchanger tubes under nonlinear acoustic streaming[J]. Journal of Vibration and Shock, 2023, 42(24): 160-168

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