THE KINETIC MODEL OF ONE-COMPONENT GAS FLOW DURING EVAPORATION IN A POROUS LAYER

A new approach is developed for mass transfer by making use of the statistical model of a porous body based on the methods of the kinetic theory of gases. The collision integral in the one-dimensional kinetic equation is replaced by the effective “external” force, which is the result of the collective interaction of gas molecules with the motionless particles. Evaporation from a recessed boundary and gas filtration in a porous layer are considered. Simple expressions are obtained for the permeability coefficient and pressure jump (output resistance) at the gas-porous medium boundary as a function of the Kn number. Theoretical and experimental results are compared.     

THE KINETIC MODEL OF ONE-COMPONENT GAS FLOW DURING EVAPORATION IN A POROUS LAYER

A new approach is developed for mass transfer by making use of the statistical model of a porous body based on the methods of the kinetic theory of gases. The collision integral in the one-dimensional kinetic equation is replaced by the effective “external” force, which is the result of the collective interaction of gas molecules with the motionless particles. Evaporation from a recessed boundary and gas filtration in a porous layer are considered. Simple expressions are obtained for the permeability coefficient and pressure jump (output resistance) at the gas-porous medium boundary as a function of the Kn number. Theoretical and experimental results are compared.     

管内稠密气固两相流数值模拟计算:颗粒动力学方法

基于稠密气固两相流流体动力学模型、颗粒动力学的颗粒湍动能模型 (KTGF)和气体湍动能模型(SGS) ,模拟计算结果得到了实验研究所揭示的环 -核流动结构 .模拟计算与Miller和Gidaspow的实验结果进行了比较 ,颗粒相浓度、速度和颗粒相动力黏性系数分布与实验值基本吻合 .     

循环流化床多组分颗粒气固两相流动模型和数值模拟

基于稠密气体分子运动论和颗粒动力学,考虑多组分颗粒中颗粒组分与颗粒组分、颗粒组分内颗粒之间的相互作用以及气体与颗粒之间的相互作用,提出多组分颗粒非等温颗粒气固两相流动模型.以颗粒压力、径向分布函数、黏度、颗粒碰撞耗散等耦合各颗粒组分间和颗粒间的相间作用.采用大涡模拟方法模拟气相湍流流动.提出了多组分颗粒的径向分布函数计算方法.对循环流化床上升管中双组分颗粒气固两相流动特性进行了数值模拟,模拟结果揭示了上升管中双组分颗粒气固两相流动的环-核流动结构,得到了平均颗粒粒径的轴向和径向分布规律,计算结果与文献中实验结果相吻合.     

稠密气体理论在催化裂化提升管中的应用

运用已建立的颗粒动力学模型并耦合催化裂化反应的十三集总动力学模型,建立了催化裂提升管反应器内反应油气和催化剂颗粒的传质,反应的数学模,结合工业提升管的操作参数,模拟预测了速度场,温度场和组分分布。     

循环流化床提升管气固湍流的计算流体力学模拟——k-ε-kp-εp-Θ5参数双流体模型

提出了用k -ε-k_p-ε_p-Θ 5参数的双流体模型来模拟循环流化床提升管中的气固湍流 .模型用颗粒动力学理论描述颗粒与颗粒间的碰撞 ,用低Reynolds数湍流方程分别模拟气相和颗粒相的湍动 ,并且考虑了气固两相湍动的相互作用 .模拟所得颗粒速度和浓度的径向分布与实验结果吻合良好 .分析表明 :在时间和空间域上 ,采用颗粒相湍动与颗粒间碰撞分离处理和颗粒相湍能及耗散方程的引入是合理的 ;颗粒相湍动与两相湍动相互作用的封闭条件是影响模拟结果的重要因素 .     

垂直管中油,气,水三相流总流量测量模型研究

基于集流型涡轮流量计与放射性低能源密度—持水率计在大庆生产测井研究所油、气、水三相流动环路中的实验响应结果，首先考察了用于气液两相流中涡轮流量计的Ａｙａ物理模型，进而提出了经过校正后用于确定油、气、水三相流总流量的测量模型，用此模型预测三相流总流量与流动环标定数据对比后其误差小于５％，满足了石油工业应用要求     

气体不平衡状态理论方程的推广应用(Ⅶ)——液体定压比热容理论方程

将由氩模型微分方程创立的气体不平衡状态理论方程推广应用于液体,导出液体定压比热容理论方程,经以极性与非极性等32种结构类型220种纯质的986个实验数据检验,平均误差为0.85％,优于前人公式,有重要的理论意义与广泛的应用价值.