Abstract:

A 3-D numerical simulation of the flow and heat transfer process in a concavo．convex tube was carried out by using the Fluent Software.Thus,the velocity and temperature distributions inside the tube were obtained.By the comparison between the simulated results of the concavo-convex tube with those of the smooth tube,it is indicated that the resistance coemcient and the heat transfer coemcient of the concavo.convex tube are much larger
than those of the smooth tube,and that,comparing the concavo-convex tube with the smooth tube,the resistance coemcient ratio increases with an increasing Reynolds number.while the heat transfer coeficient ratio decreases. It is also shown that,in the simulation range,when Reynolds number ranges from 2757.76 to 13788.79, the resis.tance coeficient ratio and the heat transfer coeficient ratio respectively vary from 5.530 8 to 8.3663 and from 2.289 to 1.585.The overall evaluation affirms that the integrate property of the concavo-convex tube obviously im-proves at a lower velocity,which means that the concavo-convex tube is adaptive to the heat transfer enhancement at lower velocity.

Key words: concavo-convex tube, heat transfer, flowing resistance, integrate property, numericM simulation