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A General Equation for Calculating the ’True’ Height of Transfer Unit in Extraction Columns
mass transfer extraction columns ’true’ height of transfer unit
2009/4/28
Based on single drop mass transfer models and two phase flow equation, a general equation for calculating the ’true’ height of transfer unit of extraction columns was derived and tested with four typ...
Correlation between hysteresis of gas-liquid mass transfer and liquid distribution in a trickle bed
trickle-bed reactor radial liquid distribution gas-liquid mass transfer
2009/4/27
Correlation between hysteresis of gas-liquid mass transfer and liquid distribution in a
trickle bed.
Electrochemical measurement of flow parameters in dilute solution
electrochemical measurement ionic migration
2009/4/22
Electrochemical measurement of flow parameters in dilute solution.
Estimation of Pool Boiling Heat Transfer Coefficients of Ethanol-Water Mixtures
heat transfer boiling water-ethanol mixture estimation.
2009/4/21
Based on the analysis of the principles of heat and mass transfer from the liquid bulk to bubble surface during nucleation, a new estimation method to predict the heat transfer of the nucleate pool ...
Heat Transfer between Immersed Horizontal Tubes and Aerated Vibrated Fluidized Beds
Vibration heat transfer vibration fluidization heat transfer
2009/4/21
Heat transfer coefficients between an immersed horizontal tube and an aerated vibrated fluidized bed are measured. There is a maximum value in the h-G experimental curve. The heat transfer coefficient...
Influence of phase ratio on packing efficiency in columns for mass transfer processes
phase ratio height of a transfer unit packings
2009/4/21
Influence of phase ratio on packing efficiency in columns for mass transfer processes.
Based on the method of molecular thermodynamics, the mass transfer mechanism at gas-liquid interface is studied theoretically, and a new mathematical model is proposed. Using laser holographic inter...
For the mass transfer to single drops during the stage of steady buoyancy-driven motion, experimental measurement is complicated with the terminal effect of additional mass transfer during drop form...
CO2安全阀排放管道堵塞后融化过程模拟
二氧化碳 安全阀 融化 压力
2009/2/20
通过安全阀向大气排放高压CO2时固体CO2会在下游突扩处发生周期性的堵塞和融化过程，对被保护系统的安全有重要影响。为了了解融化过程的特性，本文对下游发生堵塞后通过CO2安全阀的排放过程建立了动态仿真模型，利用实验数据进行了验证，并分析了安全阀进口参数和管道几何尺寸对融化过程的影响。研究结果表明：堵塞发生后下游管道内压力先增后减；安全阀和堵塞处之间管道的长度和半径增加会使下游管道内压力变化变平缓，最...
R134a在水平双侧强化管外沸腾换热
沸腾换热 R134a
2009/2/20
对氟里昂R134a在水平单管外的沸腾换热性能进行了试验研究，试验管为4根双侧强化管。在蒸发温度为8℃时比较不同肋型的强化换热性能。结果表明：所研究的强化管均有明显的强化换热作用，E12管的总传热系数略高于其他强化管，其管外沸腾传热系数相对于光管Cooper公式预测值的强化倍率为2.23～2.71，平均值为2.54。由于R22和R134a的物性不同，其管外沸腾传热系数约比R134a高出20%～40%...
R410A-油混合物在7 mm强化管内流动沸腾的换热特性
强化管内 R410A-油混合物
2009/2/20
实验研究了环保替代制冷工质R410A-润滑油混合物在强化管内的流动沸腾换热特性，探索了质流密度、干度和平均油浓度对换热特性的影响。实验测试管为内螺纹强化管，长度为2000 mm、外径为7.0 mm。实验结果表明，纯制冷剂R410A的传热系数随干度的增大先增大后减小，峰值出现在干度为0.7～0.8左右;对于R410A-油混合物，在干度小于0.5的工况下，油的存在增强换热，在干度大于0.6的高干度情况...
实验研究了环保制冷工质R410A-润滑油混合物在直强化管和C形强化管内流动沸腾的摩擦压降特性。实验测试管为内螺纹强化管，外径为7.0 mm。实验工况的蒸发温度为5℃，质流密度为200～400 kg·m-2·s-1，热流密度为7.56～15.1 kW·m-2，入口干度为0.1～0.7，平均油浓度为0～5%。实验结果表明，R410A-油混合物在直强化管和C形强化管内流动沸腾的摩擦压降随平均油浓度和质流...
氨基酸扩散系数的分子动力学模拟
分子动力学模拟 氨基酸 扩散系数
2009/2/20
采用分子动力学模拟的方法模拟了298. 15 K正则系综下甘氨酸、丙氨酸等12种氨基酸在水中的扩散过程，扩散系数的计算采用微分-区限变分法。计算结果表明：相同浓度下按不同分子数样本计算得到的扩散系数有较大差别，且分子数越多则模拟结果越接近于实验值。5种氨基酸在水中的扩散系数与文献值相对比，误差小于7%。还用同样的方法模拟了氧气在水中的扩散过程，模拟结果与实验结果吻合也较好。实验表明采用分子模拟手段...
采用数值计算方法分析超声速气流流过安装凹槽稳定器的燃烧室气动机理和边界层对混合和燃烧的影响。复杂的激波、膨胀波结构和激波边界层的作用有利于气流混合；同时，凹槽内的低速回流区不断和主流气体发生质量动量交换，可以起到点火和火焰稳定的作用。