ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
CONDENSATION HEAT TRANSFER CHARACTERISTICS OF AMMONIA-WATER VAPOR MIXTURE ON A VERTICAL FLAT SURFACE
Аннотация
The theoretical and experimental investigation on condensation heat transfer of ammonia-water vapor mixture on a vertical flat surface is described in this paper.
The theoretical analysis is based on the two-phase boundary layer theory. The conservation equations for mass, momentum and energy were derived for both the liquid and vapor layers. These equations were solved by connecting solutions for liquid and vapor layers at the liquid-vapor interface. The theoretical analysis revealed that the diffusion process in the liquid layer (condensate) is only important for the limited region near the leading part of the vertical flat surface and that the concentration of ammonia (more volatile component) in the vapor layer becomes high in the vicinity of liquid-vapor interface.
The condensation heat transfer experiment on a vertical flat surface was conducted to obtain overall performance of condensation. The ammonia concentration measurement in the vapor layer near the condensing surface was also performed by using the recent CARS (Coherent Anti-Stokes Raman Spectroscopy) technique and revealed that high concentration region of ammonia exists in the vicinity of liquid-vapor interface.
Reasonable agreement between analysis and experiment was obtained for both the heat transfer coefficient and ammonia concentration in the vapor layer.
The theoretical analysis is based on the two-phase boundary layer theory. The conservation equations for mass, momentum and energy were derived for both the liquid and vapor layers. These equations were solved by connecting solutions for liquid and vapor layers at the liquid-vapor interface. The theoretical analysis revealed that the diffusion process in the liquid layer (condensate) is only important for the limited region near the leading part of the vertical flat surface and that the concentration of ammonia (more volatile component) in the vapor layer becomes high in the vicinity of liquid-vapor interface.
The condensation heat transfer experiment on a vertical flat surface was conducted to obtain overall performance of condensation. The ammonia concentration measurement in the vapor layer near the condensing surface was also performed by using the recent CARS (Coherent Anti-Stokes Raman Spectroscopy) technique and revealed that high concentration region of ammonia exists in the vicinity of liquid-vapor interface.
Reasonable agreement between analysis and experiment was obtained for both the heat transfer coefficient and ammonia concentration in the vapor layer.