G0610104 Boiling heat transfer enhancement by welding aluminum foil with three dimensional structure on heat transfer surface

Abstract

Nucleate boiling enhancement technique with "re-entrant cavities" has already been well known. However, there are restrictions on the material and shape of the heat transfer surface, and it has not been popular yet. The purpose of this study is to form re-entrant cavities on the heat transfer surface by welding aluminum foil with a fine structure and to develop the nucleate boiling enhancement surface applied to a wide range of fields. Boiling heat transfer coefficients of the developed enhancement surface were measured and compared with those of smooth one. Test refrigerant is HCFC 123 and the test pressure is 1 atm. The enhancement rate of about 10 was obtained.