Free-convection condensation of an ammonia/water vapor mixture on a horizontal smooth tube

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Heat Transfer - Japanese Research

OSTI ID:131592

Goto, Masao ^[1]; Kojima, Mitsuo; Kashiwagi, Takao ^[2]; Koyama, Shigeru ^[3]; Fujii, Tetsu

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1. Tokyo Univ. of Mercantile Marine (Japan). Dept. of Electronic and Mechanical Engineering
2. Tokyo Univ. of Agriculture and Technology (Japan). Dept. of Mechanical Systems Engineering
3. Kyushu Univ., Kasuga, Fukuoka (Japan). Inst. of Science and Industry

The heat-transfer characteristics of free-convection condensation of an ammonia/water vapor mixture on a horizontal tube are investigated. The heat-transfer coefficients of ammonia/water vapor mixtures are predicted by solving the appropriate algebraic equations, and the results show that the heat-transfer coefficients of the mixtures are lower than those of the pure components, ammonia and water. Experiments were also performed to investigate the condensation behavior of the vapor mixture on a horizontal smooth tube over a wide range of mass fraction of each component. The results indicate that the experimental heat-transfer coefficients agree well with the theoretically predicted values. Observation of the condensate film reveals the appearance of three types of flow, namely, smooth film, stationary ringwise film, and turbulent ringwise film.

• OSTI ID: 131592
• Journal Information: Heat Transfer - Japanese Research, Journal Name: Heat Transfer - Japanese Research Journal Issue: 7 Vol. 23; ISSN 0096-0802; ISSN HTJPAU
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AMMONIA
NATURAL CONVECTION
ORIENTATION
REFRIGERANTS
TUBES
VAPOR CONDENSATION
WATER VAPOR