Effect of Heat Exchange on the Interfacial Instability of Gas-Liquid Jet
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摘要: 研究了平面分层气-液射流在非线性温度分布条件下的界面不稳定性性质.考虑了气体的可压缩性、液体的粘性、以及气体热导率和密度随温度变化等事实.并应用正则模态方法将问题转化为四阶变系数常微分方程,用数值积分和多重打靶法对模型的空间模式进行了计算,研究了不稳定模态随各物理参量的变化趋势.计算表明模型所体现的不稳定性特征与其它模型的计算结果是一致的.同时计算还得出气体和液体的温差越小、雷诺数越大、热导率变大均将有利于液体射流有效雾化的结果.该结论与HJE.Co.Inc(Glens Falls,NY,USA)的实验数据是定性吻合的.Abstract: The classical linear instability theory was applied to the planar stratified two-layers flow with high speed compressible gas layer impacting on incompressible viscous liquid layer.The walls were kept at different temperatures,resulting in heat transfer across the layers.The thermal conductivity and the density of the gas were alerted when the temperature changes.After some treatment,a four-order stiff ordinary differential equation was derived,and numerical integration and multi-shooting method were used to solve this equation for its spatial mode calculation.The numerical results of characteristic parameters show good coincidence with other models.At the same time,when the wall temperature ratio decreases,as well as the Reynold number and the gas thermal conductivity change increases,the atomization would be more efficient and producing finer droplets.And the results show good fit with the experimental datum of HJE.Co.Inc(Glens Falls,NY,USA).
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Key words:
- heat exchange /
- jet /
- interfacial instability /
- spray forming
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