本文用实验方法研究了浓度为1500 wppm 的聚丙烯酰胺(PAM)溶液在周期性渐扩渐缩通道内层流流动与换热问题.研究表明,大约经过8个周期后流动进入充分发展阶段,而换热则要经过大约20个周期后才能进入充分发展阶段.在充分发展阶段,阻力系数和换热Nusselt数随广义Reynolds数的变化关系式分别为: f=135×Re*-0.632和Nu＝10.5×Re*0.589.
参考文献
| [1] | Hartnett J p .Viscoelastic Fluids:A New Challenge in Heat Transfer[J].ASME Journal of Heat Transfer,1992,114:296-303. |
| [2] | Dodson A G;Townsend P;Walters K .Non-Newtonian Flow in Pipes of Noncircular Cross Section[J].Computers and Fluids,1974,2:317-321. |
| [3] | Gao s x;Hartenett J P .Non-Newtonian Fluid Laminar Flow and Forced Convection Heat·Mass Transfer in Rectangular Ducts[J].International Communications in Heat and Mass Transfer,1992,19:673-686. |
| [4] | 毛一平 .垂直上升管内非牛顿流体流动沸腾换热特性的研究[D].西安:西安交通大学,1996. |
| [5] | 杨小玉;徐佳莹 等.作牛顿流体在渐扩渐缩周期性通道内充分发展段的换热规律[J].哈尔滨工业大学学报,1999,31(zk):61-70. |
| [6] | 杨世铭;陶文铨.传热学[M].北京:高等教育出版社,1998 |
| [7] | Kozicki W;Chou C H;Tiu C .Non-Newtonian Flow in Ducts of Arbitrary Cross-Sectional Shape[J].Chemical Engineering Science,1996,21:665-679. |
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