Study on Bubble Dynamics of Boiling in Vertical Rectangular Mini-channel
Boiling heat transfer in vertical rectangular minichannels with a width of 2mm and a length of 390mm is studied in this paper. The courses of bubbles generation, growth and departure were numerically simulated, the influence of the wall overheating and the movement of bubble bottom micro-layer is analyzed and compared with the experimental datum. All the calculation conducted takes the gravity, surface tension and wall adhesion into account It is found that surface tension is much more important than gravity in the process of boiling heat transfer. As the overheating is increased, the departure diameter D of bubbles increases significantly. When the bubble diameter D is larger than 1.5mm, it will be influenced by the incoming flow. The existence of bubble bottom micro-layer accelerates the flow convection on the wall and increases the coefficient of heat transfer. The results of simulation have a good coherence with experimental datum.
bubble dynamics numerical simulation boiling heat transfer heat transfer enhancement
Lei Guo Shusheng Zhang Yaqun Chen Lin Cheng
Institute of Thermal Science & Technology of Shandong University Jinan, 250061, China
国际会议
成都
英文
219-222
2010-06-12（万方平台首次上网日期，不代表论文的发表时间）