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1 INTRODUCTIONIt is commonly recognized that the liquid phase flow pattern is one of the most importantfactors affecting the mass transfer efficiency of an industrial scale tray column,Experimentalwork revealed that the liquid flow on a tray is irregular in nature and accompanyoccasionally with channeling,reverse flow or circulation.Such irregularity becomes pronounced 相似文献
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精馏塔板上气泡尺寸分布是计算精馏塔板效率以及设计和操作精馏塔的关键参数,但对它的预测受到理论不完善、实验测试手段落后及求解计算困难等方面的限制。本文以Kolmogoroff各向同性湍流理论为基础并结合格率理论,利用计算机图形处理技术对气泡的尺寸分布现象进行观察,分析气泡的聚并和破裂机理。通过已建立的气泡破裂和聚并速率模型,得到精馏塔板上气泡粒数衡算方程。针对气泡粒数衡算方程求解的复杂性,本文采用了Monte Carlo模拟技术来简化气泡粒数衡算方程的求解。求解结果与实验数据相吻合并显示气泡尺寸分布为对数正态分布,这与其他研究者的结论相一致。由所求得的气泡尺寸分布可以进一步计算出气泡的Sauter平均直径以及气液相界面积。 相似文献
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从热力学基本原理出发,对电场中的热力学模型进行了理论推导,从理论上证明了外加电场对汽液平衡的影响,结果表明,对于二组元物系,施加电场与未施加电场情况下某一组分的液相组成之比的对数与溶液介电常数一次方成正比,与所施加电场强度的平方成正比。 相似文献
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磁场对烷烃和醇类粘度的影响 总被引:4,自引:1,他引:3
利用磁场的磁化效应对烷烃和醇类的粘度进行了研究,结果表明,磁化正丁醇、正戊醇、正己醇、正庚醇、正辛醇的粘度随磁场强度的增大而减小;异丁醇粘度随磁场强度的增大而增大;正戊烷、正己烷、正庚烷的粘度不随磁场强度而变化。在此基础上,对反磁性物质的磁化机理进行了探讨。 相似文献
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A simplified turbulent model and a modified k-Σ two equation model are proposed todescribe the liquid velocity profiles in a bubble column taking into consideration of the effect of gasdrag force and gas hold-up.In the simplified mode1 the Reynolds equation of motion was adoptedand the turbulent viscosity was calculated from an empirical correlation which was deduced fromour experimental data.The calculated liquid velocity profiles were compared between the proposedmodel and the standard k-Σ two equation model as well as experimental data.The result shows thatthe proposed model simulates and predicts the liquid velocity field most satisfactorily and in goodagreement with the experimental measurement. 相似文献