气固两相流横掠圆管传热的研究

Heat Transfer of Tubes in Gas-Solid Cross Flow

本文根据气固两相流横掠圆管的传热机理，建立了能综合考虑颗粒运动轨迹、颗粒与壁面的碰撞频率、碰撞角度、颗粒在壁面停留时间、颗粒与壁面接触面积、固体颗粒浓度、颗粒粒度、圆管位置、烟气流速和温度等因素对气固两相流传热影响的两维数学模型。模型通过对流场和颗粒场的计算可较好地模拟气固两相流传热过程的复杂性和随机性，模型计算结果与实验相吻合。本模型可为工程应用提供较可靠的计算方法。

According to heat transfer mechanism of tubes in gas-solid flow, a two dimension mathematical model is established to predict heat transfer characteristics of twophase gassolid flow. Many effective factors have been considered in this model, such as particle motion trace, particle impact frequency, impact angle, resident time of particle in heated surface,contact area between particle and heated surface, particle concentration in flue gas, particle size, flue gas velocity, temperature and so on. The complex and random characteristics of gas -solid heat transfer process is been well simulated through the calculation of flow flied and particle motion field. The calculation results are agree well with the experimental data, which illustrates this model can provided reliable calculating method for engineering design.