An Experimental Study on the Heat and Mass Transfer of A Horizontal Ice Surface

• Main Authors: Yung-Cheng Huang, 黃永成
• Other Authors: 蔡尤溪
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/y7bh43

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 96 === This study presents the experimental results of different speeds of air flow over a horizontal ice surface. The temperature and the humidity at the inlet of the airflow were controlled in a narrow range. To observe the relationship of heat and mass transfer between the ice and the air, a long air duct was designed to obtain the experimental data. The ice layer was located in the center of the air duct. The temperature variation of the horizontal ice surface and the states of air at both the inlet and outlet were measured. The variation of air temperature and the ice temperature were used in the heat and mass transfer calculations. Air flow rates corresponding to different Reynolds number were used in the experiments. The variations of heat and mass transfer with Reynolds number were presented. The coefficients of heat and mass transfer thus found over an ice surface could be used as in the calculation of condensation rate on an ice surface. The mass transfer coefficient was obtained using Lewis number equal to one. The condensation rate and the latent heat flux decreased during the experiments. This was due to larger differences of air temperature and ice temperature at the beginning.