短管直径对短管蜂窝夹套传热性能的影响

Effect of Short Tube Diameter on Heat Transfer Performance of Short Tube Honeycomb Jacket

基于某工程中1台干燥机的短管蜂窝夹套结构形式,通过将短管尺寸由Ф90 mm×5 mm逐渐增大到Ф135 mm×7.5 mm,建立了模型1~模型6共6种夹套流场计算有限元模型,模拟分析了各模型速度场和温度场分布特性,计算并对比了各模型在不同体积流量下的总传热系数。模拟数据表明,随着短管尺寸的增大,夹套流体域内最大流速呈持续递减趋势。随着短管尺寸的增大,夹套流体域内温度场均匀性先升后降,模型5温度场分布均匀性最佳,总传热系数最大。随着体积流量的增加,夹套总传热系数持续增大。随着短管直径的增大,夹套总传热系数先升后降,模型5总传热系数最大。综合分析表明,在一定范围内增大短管的直径,能够强化夹套传热效果。

Based on the short tube honeycomb jacket structure of a drying machine in a certain project,the size of the short tube was set at Ф90 mm×5 mm and gradually increased to Ф135 mm×7.5 mm.A finite element model was established to calculate the flow field of six jacket models,from model 1 to model 6.The velocity and temperature distribution characteristics of each model were simulated and analyzed,and the total heat transfer coefficient of each model was calculated and compared at different volume flow rates.The simulation data shows that as the size of the short tube increases,the maximum flow velocity in the jacket fluid domain shows a continuous decreasing trend.As the size of the short tube increases,the uniformity of the temperature field in the jacket fluid domain first increases and then decreases,and model 5 has the best uniformity of the temperature field distribution,the total heat transfer coefficient is the highest.As the volume flow rate increases,the total heat transfer coefficient of the jacket continues to increase.As the diameter of the short tube increases,the total heat transfer coefficient of the jacket first increases and then decreases,with model 5 having the highest total heat transfer coefficient.A comprehensive analysis shows that increasing the diameter of the short tube within a certain range can improve the heat transfer performance of the jacket.