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- 2015
带肋U型通道中的汽雾/空气流动与换热数值研究
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Abstract:
采用SST湍流模型对静止带肋U型通道中的汽雾/空气流动与换热特性进行了数值研究,分析了不同汽雾初始直径和初始质量浓度对汽雾/空气冷却性能的影响,比较了汽雾/空气、空气和蒸汽3种冷却工质的换热性能。研究表明:汽雾初始直径越大,汽雾流动距离越大,并存在一个最佳的初始直径;汽雾质量浓度增加,汽雾流动距离增大,汽雾的换热效果、阻力损失和热力性能因子增大;在雷诺数为40 000时,汽雾/空气的通道平均努塞尔数因子相对于蒸汽和空气分别增加了8.6％和25.39％,热力性能因子分别增加了6.58％和23.47％。
The flow and heat transfer characteristics of air/mist coolant in non？？rotating ribbed two？？pass rectangular channel were numerically investigated with SST turbulence model. The effect of mist initial diameter and mist initial mass concentration on the mist/air cooling parameters was analyzed. Three kinds of coolants, mist/air, air and steam, were comparatively discussed for the heat transfer performance. The results show that the mist flow distance increases with increasing mist initial diameter and there exists an optimum mist diameter; the mist flow distance, the averaged channel Nusselt number, the flow resistance and the thermal performance factor increase with the mist initial mass concentration. For the case of Re=40 000, the averaged channel Nusselt number of mist/air increases by 8.6％ and 25.39％ compared with steam and air respectively, and that of the thermal performance factor increases by 6.58％ and 23.47％
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