EFFECT OF CONICAL-RING INSERTS ON HEAT TRANSFER IN A TUBE
Effects of the conical-ring insertion on heat transfer and flow friction characteristics in a uniform heat flux tube have been studied experimentally. In the experiments, the turbulent flow was introduced by using conical-ring placed inside the inner test tube of the heat exchanger with different diameter ratios, DR = d/D =0.5, 0.6 and 0.7. The experimental results revealed that the increase in heat transfer rate of the conical-ring inserts is found to be strongly influenced by vortex motion. Over the range investigated, the mean Nusselt numbers for using the enhancement devices with DR = 0.5, 0.6, and 0.7, are 297％, 238％ and 191％, respectively, higher than that for the plain tube. In addition, the influences of the conical-ring on the flow friction and enhancement efficiency are also investigated.
V.Kongkaitpaiboon S.Eiamsa-ard C.Thianponge
Department of Mechanical Engineering, Faculty of Engineering,Mahanakorn University of Technology,Ban Department of Mechanical Engineering, Faculty of Engineering,King Mongkut’s Institute of Technology
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）