螺旋管内幂律流体流动传热优化模拟研究  

Study on Optimization Simulation of Power-law Fluid Flow Heat Transfer in Helical Tubes

作　　者：张浩[1,2] 张志 王艳静 陈为花 包晓琳 ZHANG Hao;ZHANG Zhi;WANG Yanjing;CHEN Weihua;BAO Xiaolin

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东省绿色建筑协同创新中心,山东济南250101 [3]山东英才学院工学院,山东济南250104 [4]山东省建筑设计研究院有限公司,山东济南250001 [5]青岛腾远设计事务所有限公司,山东青岛266100

出　　处：《煤气与热力》2022年第11期19-24,34,共7页Gas & Heat

基　　金：山东省专业学位研究生教学案例库项目(SDYAL20162);山东省研究生优质课程建设项目(SDYKC19117);山东省自然科学基金项目(ZR2014JL039)。

摘　　要：分别建立不同几何参数的螺旋管,采用模拟方法,对管内幂率流体流动传热进行场协同分析。为强化螺旋管内幂律流体流动传热,在螺旋管长度方向上分别增加矩形、三角形沟槽,分析沟槽形状、尺寸对改善管内流动传热的效果。曲率越大的螺旋管,温度场与速度场的协同程度越好,流动传热性能越好。与原型螺旋管相比,增加矩形、三角形沟槽后的螺旋管摩擦阻力系数、努塞尔数均增大,矩形沟槽的影响更加明显。对于增加矩形沟槽的螺旋管,当沟槽深度一定时,摩擦阻力系数、努塞尔数均随沟槽宽度增大而增大,沟槽深度的影响比宽度影响更大。与层流相比,湍流可增强流动传热强度,增大管子相对粗糙度有助于增强流动传热强度。增加沟槽使螺旋管的综合性能得到加强。采用较大宽度、深度矩形沟槽的螺旋管综合性能最佳,采用三角形沟槽的螺旋管综合性能最差。管壁外侧的场协同角小于管壁内侧,宜针对管壁内侧适当采取强化传热措施,以提高换热效率。The helical tubes with different geometric parameters are established respectively,and the field synergistic analysis of power-law fluid flow heat transfer in the tubes is carried out by using the simulation method. In order to strengthen the flow heat transfer of power-law fluid in the helical tube,rectangular and triangular grooves are added in the length direction of the helical tube,and the effects of the shape and size of the grooves on improving the flow heat transfer in the tube are analyzed. The larger the curvature of the helical tube,the better the synergy between the temperature field and the velocity field,and the better the flow heat transfer performance. Compared with the prototype helical tube,the friction resistance coefficient and Nusselt number of the helical tube increase after adding rectangular and triangular grooves,and the influence of rectangular groove is more obvious. For the helical tube with rectangular groove,when the depth of the groove is constant,the friction resistance coefficient and Nusselt number increase with the increase of the width of the groove,and the effect of groove depth is greater than that of the width. Compared with the laminar flow regime,the turbulent flow regime can enhance the flow heat transfer intensity,and increasing the relative roughness of the tube helps to enhance the flow heat transfer intensity. The addition of groove enhances the comprehensive performance of the helical tube. The helical tube with larger width and depth rectangular groove has the best comprehensive performance,and the helical tube with triangular groove has the worst comprehensive performance. The field synergy angle on the outside of the tube wall is smaller than that on the inside of the tube wall,and appropriate measures to enhance heat transfer should be taken on the inside of the tube wall to improve the heat transfer efficiency.

关 键 词：螺旋管 幂律流体 流动传热 场协同 

分 类 号：TK124[动力工程及工程热物理—工程热物理]