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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CONTRIBUTION OF LATENT HEAT TRANSFER IN POOL BOILING

Takanori Tanaka
Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu, Fukuoka 805-8550, Japan

Tomohide Yabuki
Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu, Fukuoka 805-8550, Japan

Koji Miyazaki
Department of Mechanical and Control Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan

DOI: 10.1615/IHTC16.bae.023962
pages 815-820


KEY WORDS: Boiling and evaporation, Two-phase/Multiphase flow, Pool boiling, Latent heat transfer, heat transfer mechanism

Abstract

Pool boiling heat transfer consists of the latent heat transfer by evaporation of superheated liquid around bubble and microlayer and the forced and natural convection heat transfer. A new method for the direct measurement of the latent heat transfer in pool boiling on a plate heated surface was developed. In this method, the vapor was captured using the transparent cup placed over the heated wall, and the latent heat transfer is calculated from the descending velocity of the liquid-vapor interface in the cup. Water, ethanol and HFE-7100 were used as boiling liquids. In case of water and ethanol, the latent heat transfer was approximately 100% of overall wall heat transfer. On the other hand, in case of HFE-7100, the latent heat transfer was approximately 50% of the overall wall heat transfer. Finally, we considered to about the appertaining factor to the contribution of latent heat transfer on overall wall heat transfer by the dimensionless analysis.

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