DEVELOPMENT OF GENERAL CORRELATION FOR HEAT TRANSFER IN SINGLE-PHASE TURBULENT FLOW INSIDE INTERNALLY HELICAL-GROOVED TUBES
An experimental study of heat transfer in single-phase turbulent flow inside an internally helical-grooved tube was carried out using thirteen different kinds of grooved tubes and a smooth tube with 6.35 mm outer diameter and 1000mm working length. The range of geometric parameters of grooved test tubes were number of grooves (45 to 65), helix angle (10 to 35deg.) and fin height (0.15 to 0.3 mm). In the experiments, each of test tubes was heated at constant heat input of 1.4 kW by an electric heater. The inlet cooling water temperature was kept between 16 and 18 degree C, and the flow rate was varied from 0.03 to 0.11 kg/s. The obtained data indicated that heat transfer coefficients were from 110 to 200％ higher than those of smooth tube and increased with increasing the ratio of inner surface area of grooved tube to that of smooth tube and helix angle, while decreased with increasing the number of grooves. The correlations to predict the heat transfer coefficients were developed based on the measured data, which predicted the experimental data within ± 20％ and correlated the data reported in literature within ±30％.
N.INOUE M.GOTO
Tokyo University of Marine Science and Technology, 2-1-6 Etsuchujima Koto-ku,Tokyo, 135-8533, Japan
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）