矩形螺旋通道气液两相流流动和传热特性数值研究  

Numerical Study of Flow and Heat Transfer Characteristics of Gas-Liquid Flow in Rectangular Spiral Channel

作　　者：周云龙[1] 张超[1] 张立彦[1] 孙博[1] 

机构地区：[1]东北电力大学能源与动力工程学院

出　　处：《化工机械》2016年第3期357-364,共8页Chemical Engineering & Machinery

基　　金：国家自然科学基金项目(51276033);东北电力大学研究生创新基金项目

摘　　要：采用Eulerian模型对矩形截面螺旋通道内气液两相流进行数值模拟,研究了螺旋通道内不同轴向位置气液两相流动的速度分布、相分布和温度分布特性,并分析无量纲螺距对速度分布、温度分布、单位长度压降和换热系数的影响。对水动力模型数值结果与实验结果、传热模型数值结果与实验关联式进行对比,结果表明:在一定范围内,无量纲螺距的增加使得速度场、温度场变化梯度增大,同时壁面换热系数稍有增大;超过无量纲螺距临界值,速度场和温度场的变化梯度随无量纲螺距的增加而减小;随着无量纲螺距的增加,单位长度平均压降稍有增加,并且增加的幅度逐渐减小;无量纲螺距对相分布特性几乎无影响;随着入口截面含气率的增加,单位长度平均压降和换热效果提高。The Eulerian model was adopted to simulate gas-liquid flow within rectangular spiral channel; and the gas-liquid flow＇ s velocity distribution, phase distribution and temperature distribution in different axial positions of the spiral channel were discussed, including the non-dimensional torque＇ s effect on the velocity distribution and temperature distribution, the unit length pressure drop and the heat transfer coefficient. Comparing numerical results with experimental results of hydrodynamic model and the numerical result of heat transfer with the experimental correlation prove reliability of the simulation results. The results show that in a certain range, the torque＇ s increase can make variation gradient of the velocity field and temperature field increased, including the heat transfer coefficient of the wall slightly; however, when the torque＇ s critical value is exceeded, the variation gradient of velocity field and temperature field become decreased with the increase of the torque; as the torque increases, the average pressure drop per unit length becomes increased slightly and the this increase extent would diminish gradually; the torque has no obvious influence on the phase distribution characteristics ; this increases inlet void fraction and improves pressure drop of the per unit length and the heat transfer effect greatly.

关 键 词：矩形螺旋通道 两相流 流动特性 传热特性 数值模拟 计算流体动力学 

分 类 号：TQ022.4[化学工程]