Velocity Profiles between Two Baffles in a Horizontal Circular Tube  

作　　者：Tae-Hyun Chang Hae-Soo Lee Keon-Je Oh Doeg Hee Doh Chang-Hoan Lee 

机构地区：[1]Senior Research Fellow of RESEAT,Korea Institute of Science and Information [2]Postdoctoral Research Fellow,School of Mechanical Engineering of Kyungnam University [3]School of Mechanical Engineering,Kyungnam University [4]Division of Mechanical and Energy Systems Engineering,Korea Marine and Ocean University [5]Korea Institute of Science and Technology Information

出　　处：《Journal of Thermal Science》2014年第6期544-551,共8页热科学学报（英文版）

基　　金：supported by the RESEAT program funded by the Ministry of Science,ICT and Future Planning through the National Research Foundation of Korea;by the National Research Laboratory Program of the National Research Foundation(No.2008-0060153)of Korea

摘　　要：The shell and tube heat exchanger is an essential part of a power plant for recovering heat transfer between the feed water of a boiler and the wasted heat.The baffles are also an important element inside the heat exchanger.Internal materials influence the flow pattern in the bed.The influence of baffles in the velocity profiles was observed using a three-dimensional particle image velocimetry around baffles in a horizontal circular tube.The velocity of the particles was measured before the baffle and between them in the test tube.Results show that the flows near the front baffle flow were parallel to the vertical wall,and then concentrate on the upper opening of the front baffle.The flows circulate in the front and rear baffles.These flow profiles are related to the Reynolds number(Re) or the flow intensity.The velocity profiles at lower Re number showed a complicated mixing,concentrating on the lower opening of the rear baffle as front wall.Swirling flow was employed in this study,which was produced using tangential velocities at the inlet.At the entrance of the front baffle,the velocity vector profiles with swirl were much different from that without swirl.However,velocities between two baffles are not much different from those without swirl.

关 键 词：BAFFLE Shell and tube Tangential inlet SWIRL Particle image velocimetry 

分 类 号：TK172[动力工程及工程热物理—热能工程]