THE EXPERIMENTAL INVESTIGATION ON HEAT EXCHANGER WITH HELICAL BAFFLES
The flow field in shell-and-tube heat exchangers with helical baffles war measured using LDA. The influence on the velocity distribution, impulsive velocity by helix inclination angle and flow rate was investigated. The influence on heat-exchanging capability and flow resistance on velocity distribution was also investigated. The dimensions of heat-exchanger shell used in these experiments were 200 ×6 ×3000 mm (inner diameter ×wall thickness ×length). The heat exchanger made of organic glass and the tube bundle consisted of 52 tubes with external diameter of 15mm. Six different inclination angles were designed in double helix style, namely 30 °, 35 °, 40 °, 42 °, 45 °and 50 °. The working flow medium under normal temperature was service water. Generally, the linear velocity and impulsive velocity will increase with decreasing helix inclination angle, which promotes the heat-exchanging capability. With flow volume increasing the velocity distribution along the diameter increases on the average. The pressure drop will increase with decreasing helix inclination angle. For all of the helix inclination angles tested, the minimum pressure loss took place at a certain Reynolds Number, and at different helix inclination angles, the Reynolds number at which the minimum pressure loss occurs is different. With a general consideration, it is proposed that the optimum helix inclination angle depends upon the Reynolds number of working fluid on the shell-side of heat exchanger.
Wang Shuli Han Yongjia Shi Qingshu
Jiangsu Polytechnic University, College of Mechanical and Enrgy Engineering,Changzhou, Jiangsu Province, 213016, China
国际会议
第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)
重庆
英文
3140-3144
2009-08-01（万方平台首次上网日期，不代表论文的发表时间）