PRESSURE DROPS OF CO2 AND OIL MIXTURES IN HORIZONTAL SMOOTH AND MICRO-FIN TUBE EVAPORATORS
Experiments on pressure drop of pure CO2 and CO2-oil mixtures in evaporators with horizontal smooth and micro-fin tubes have been carried out. The smooth tube is a stainless steel tube with an inner diameter of 3.0mm. The micro-fin tube is a copper tube with a mean inner diameter of 3.04mm. Experiments were carried out at mass velocities from 190 to 1300kg/(m2·s), saturation temperatures of 0 and 10℃, the circulation ratio of lubricating oil (PAG) is from 0 to 0.87wt％. For the smooth tube, both of the homogeneous model and the Müller-Steinhagen and Heck correlation correspond well with the present experimental results for pure CO2. In the case of CO2-oil mixtures, the pressure drops of the smooth tube increase with increase in oil circulation ratio. For the micro-fin tube, the experimental pressure drops for pure CO2 are about 20～70％ higher than those of the homogeneous model. In the case of CO2-oil mixtures, the increments of the pressure drops for the micro-fin tube due to increasing the oil circulation ratio are less than those for the smooth tube.
Lei GAO Takashi ONO Tomohiro HONDA
Department of Mechanical Engineering, Fukuoka University,8-19-1 Nanakuma Jonan-ku, Fukuoka, 8140180, Department of Mechanical Engineering, Fukuoka University Graduate School Department of Mechanical Engineering, Fukuoka University
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）