Boiling Heat Transfer Enhancement in a Vertical Annulus by Introduction of Air in Liquid Flow

• 作 者: 王军 苗君 刘芸 沈自求
• 机 构: School of Chemical Engineering Dalian University of Technology, Dalian 116012, China,School of Chemi
• 出 处: Chinese Journal of Chemical Engineering
• 发表日期: 2004年05期
• 关键词: boiling vaporization latent heated interfacial inert concluded immersed bubble c

In this paper, boiling heat transfer in a vertical annulus with inner side heated with and without air introduction is experimentally studied. Results show that boiling heat transfer is significantly enhanced by the introduction of air. When air is introduced into the liquid with a temperature below boiling point, the enhancement of heat transfer is also detected. It is concluded from the study that the heat transfer enhanced by introduction of inert gas is due to the liquid vaporization at the gas-liquid interface near the wall, which removes a large amount of latent heat and lowers the interfacial temperature considerably. Thus the gas-liquid interface acts as a “heat sink” and the heat transfer is augmented significantly.

In this paper, boiling heat transfer in a vertical annulus with inner side heated with and without air introduction is experimentally studied. Results show that boiling heat transfer is significantly enhanced by the introduction of air. When air is introduced into the liquid with a temperature below boiling point, the enhancement of heat transfer is also detected. The is from the study that the heat transfer enhanced by introduction of inert gas is due to the liquid vaporization at the gas-liquid interface is near the wall, which removes a large amount of latent heat and lowers the interfacial temperature considerably. Thus the gas-liquid interface acts as a “heat sink” and the heat transfer is augmented significantly.