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首页> 外文期刊>Thermal engineering >Effect of Channel Geometry and Properties of a Vapor-Gas Mixture on Volume Condensation in a Flow through a Nozzle
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Effect of Channel Geometry and Properties of a Vapor-Gas Mixture on Volume Condensation in a Flow through a Nozzle

机译：通道几何形状和蒸气-气体混合物的性质对通过喷嘴的流中的体积凝结的影响

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AbstractA method of direct numerical solution of the kinetic equation for the droplet size distribution function was used for the numerical investigation of volume condensation in a supersonic vapor–gas flow. Distributions of temperature for the gas phase and droplets, degree of supersaturation, pressure, fraction of droplets by weight, the number of droplets per unit mass, and of the nucleation rate along the channel were determined. The influence of nozzle geometry, mixture composition, and temperature dependence of the mixture properties on the investigated process was evaluated. It has been found that the nozzle divergence angle determines the vapor–gas mixture expansion rate: an increase in the divergence angle enhances the temperature decrease rate and the supersaturation degree raise rate. With an increase or decrease in the partial pressure of incondensable gas, the droplet temperature approaches the gas phase temperature or the saturation temperature at the partial gas pressure, respectively. A considerable effect of the temperature dependence of the liquid surface tension and properties on gas phase parameters and the integral characteristics of condensation aerosol was revealed. However, the difference in results obtained with or without considering the temperature dependence of evaporation heat is negligible. The predictions are compared with experimental data of other investigations for two mixtures: a mixture of heavy water vapor with nitrogen (incondensable gas) orn-nonane vapor with nitrogen. The predictions agree quite well qualitatively and quantitatively with the experiment. The comparison of the predictions with numerical results from other publications obtained using the method of moments demonstrates the usefulness of the direct numerical solution method and the method of moments in a wide range of input data.
机译： 摘要 使用液滴尺寸分布函数动力学方程的直接数值解方法，对液滴的体积凝结进行了数值研究。超音速蒸气流。确定了气相和液滴的温度分布，过饱和度，压力，液滴的重量比，每单位质量的液滴数以及沿通道的成核率。评估了喷嘴几何形状，混合物组成以及混合物性质对温度的依赖性对所研究过程的影响。已经发现，喷嘴的发散角决定了蒸气-气体混合物的膨胀率：发散角的增加会提高温度的降低率和过饱和度的提高率。随着不凝性气体的分压的升高或降低，液滴温度分别接近于分压下的气相温度或饱和温度。揭示了液体表面张力的温度依赖性和性质对气相参数和冷凝气溶胶的整体特性的显着影响。但是，在考虑或不考虑蒸发热的温度依赖性的情况下获得的结果差异可以忽略不计。将预测结果与其他研究的两种混合物的实验数据进行比较：两种混合气体：重水蒸气与氮气（不凝性气体）的混合物或 n -壬烷蒸气与氮气的混合物。这些预测在质量和数量上与实验非常吻合。将预测结果与使用矩量法获得的其他出版物的数值结果进行比较，证明了直接数值解法和矩量法在各种输入数据中的有用性。

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