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首页> 外文期刊>Journal of enhanced heat transfer: Theory and application in high performance heat and mass transfer >HELICAL VORTICES AND DECAY IN A VERTICAL GAS-LIQUID TWO-PHASE FLOW INDUCED BY A SHORT TWISTED TAPE
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HELICAL VORTICES AND DECAY IN A VERTICAL GAS-LIQUID TWO-PHASE FLOW INDUCED BY A SHORT TWISTED TAPE

机译：HELICAL VORTICES AND DECAY IN A VERTICAL GAS-LIQUID TWO-PHASE FLOW INDUCED BY A SHORT TWISTED TAPE

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摘要

Twisted tape has been widely used in industry and heat transfer enhancement. However, most research is focused on the single-phase flow induced by the tape; the flow characteristics in the gas-liquid two-phase flow induced by the tape are largely unexplored. In this work, vortex motion and decay characteristics in a gas-liquid two-phase swirl flow induced by a short twisted tape were studied by numerical simulation, and two parameters used to quantitatively describe the decay in a two-phase swirl flow have been proposed. Calculated results show that two corotating helical vortices appear and remain in the swirling flow, and these vortices significantly influence liquid distribution. Two peaks of liquid film thickness appear in the circumferential direction, and the liquid film gradually becomes uniform along the streamwise direction. Low pressure core locates near the region with thick liquid film instead of the vortex center. Two parameters, two-phase absolute vortex flux and swirl number, have been proposed to quantitatively describe the decay in a gas-liquid two-phase swirl flow. The parameters show that swirl decays quickly with increasing gas velocity and decreasing liquid velocity in the two-phase swirl flow. Finally, a correlation has been developed to describe the swirl decay in a gas-liquid two-phase flow. The research results will have an important meaning for heat exchanger and heat transfer enhancement in industry.

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