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.
|Number of pages
|Heat Transfer - Japanese Research
|Published - 1994
All Science Journal Classification (ASJC) codes
- Fluid Flow and Transfer Processes