CAJ | 학술논문

采用雷诺应力模型和Cross粘度方程,对二维轴对称圆管内湍流流动的聚丙烯酰胺稀溶液(PAM)的流场和温度场进行了数值模拟.在数值计算结果的基础上,系统研究了流速对减阻流体的减阻性能和传热特性的影响.结果表明,减阻流体的减阻率和传热降低率随流速的增大逐渐增大到渐进值,而且传热降低率恒大于减阻率. 减阻流体柯尔本(Colburn)因子与摩擦系数的对比结果表明柯尔本比拟,特别是在较低流动雷诺数下有较大偏差.
채용뢰낙응력모형화Cross점도방정,대이유축대칭원관내단류류동적취병희선알희용액(PAM)적류장화온도장진행료수치모의.재수치계산결과적기출상,계통연구료류속대감조류체적감조성능화전열특성적영향.결과표명,감조류체적감조솔화전열강저솔수류속적증대축점증대도점진치,이차전열강저솔항대우감조솔. 감조류체가이본(Colburn)인자여마찰계수적대비결과표명가이본비의,특별시재교저류동뢰낙수하유교대편차.
The reynolds stress model and the Cross viscosity equation have been adopted to simulate the turbulent flow and temperature fields of the dilute polyacrylamide (PAM) solution in a two-dimensional axisymmetric circular tube. The effect of flow velocity on drag reduction and heat transfer performance of drag-reducing fluid have been investigated systematically. The results indicate that the drag reduction (DR) and heat transfer reduction (HTR) of drag-reducing fluid increase with increasing flow velocity and approach the asymptotes, and HTR is greater than DR all the time. The comparison between Colburn factor and friction coefficient shows that Colburn analogy is not so much applicable to the drag-reducing fluid,especially for the low bulk flow Reynolds number conditions.