RESEARCH ON HEAT TRANSFER AND FLOW CHARACTERISTICS OF CORRUGATED TUBES
Pointing at the special characteristics of flow field in corrugated tubes, a numerical simulation was performed by using the RNG k-ε . turbulence model for three-dimensional fluid and the boundary condition of constant wall temperature in the tubes. The characteristics of turbulent flow and heat transfer in corrugated tubes of the diameter 16mm and the length 740mm were studied, with water at constant temperature as the medium and in different conditions of the velocity of flow at 0.5m/s, 0.8 m/s, 1.2 m/s. The temperature, velocity distribution, pressure value, turbulence intensity and the Nu number at different sections for fully developed fluid were obtained, which were compared with the results of smooth tubes. The numerical results showed that the quantity of heat transfer increased with the increase of the velocity of flow and the effect of turbulent enhanced heat transfer strengthened. It was found that the corrugated tubes can significantly enhance the heat transfer under the same diameter condition.
corrugated tubes Heat transfer enhancement numerical simulation Heat Transfer and Flow characteristics
Changfa JI L.J.HOU M.WANG
School of Energy and engineering, Xian University of Science and Technology,Yanta Road 58, Xian City, 710054, China
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）