Experimental Study on Heat Transfer Characteristics of Two-phase Flow in Square and Rectangular Channels
Taylor flow in non-circular cross-section flow channels such as micro-heat sinks and micro-channel heat exchangers has received extensive attention due to its heat-enhancing properties.In this paper,under the boundary of constant heat flux density,air and water are used as working fluids to conduct an experimental study on the heat transfer characteristics of gas-liquid two-phase flow in horizontal pipes with cross-sections of 4 mm×4 mm and 5 mm×3 mm.The effects of different inlet gas and liquid inlet Reynolds numbers and liquid slug lengths on the wall temperature and Nusselt number of tubes and rectangular tubes are discussed.The results show that there are some differences between the liquid phase Reynolds number and the gas phase Reynolds number on the heat transfer coefficient of the rectangular tube and the rectangular tube.The results of this paper provide a reference for the design of microchannel heat exchangers and the establishment of mathematical models for heat transfer of rectangular and square tubes Taylor flow.
heat transfer characteristicsgas-liquid two-phase flowrectangular channelsquare channel
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