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传热学
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ISSN 打印: 1064-2285
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传热学

DOI: 10.1615/HeatTransRes.2016007475
pages 379-390

EXPERIMENTAL STUDY OF CONDENSATION OF HUMID AIR IN LAMINAR FLOW IN A VERTICAL CHANNEL

V. Murali Krishna
Department of Mechanical Engineering, B.V. Raju Institute of Technology, Narsapur, Medak (Dist)-502313, India
V. Dharma Rao
Department of Mechanical Engineering, G.V.P. College of Engineering, Visakhapatnam, India

ABSTRACT

An experimental study is presented for the problem of laminar film condensation of a vapor from a vapor-gas mixture in laminar flow in a vertical parallel plate channel. The flowing gas-vapor mixture contains a noncondensable gas of high concentration. An example of this case is the flow of humid air, in which air is present in high concentration. Vapor condenses at the dew point corresponding to the mass fraction of vapor in the gas-vapor mixture and total pressure. The rate of condensation is controlled by the diffusion of vapor through the noncondensable gas. The test rig is instrumented to obtain all data necessary to estimate the end condensate Reynolds number and average condensation heat transfer coefficient, and to measure the gas-vapor mixture temperature along the length of the channel. The condensation Reynolds numbers at the exit of the channel and average condensation heat transfer coefficient estimated from the experimental data are compared with the results obtained from theoretical model of Dharma Rao et al. (2009). The experimentally measured local temperatures of the gas-vapor mixture are compared with the theoretical results obtained for identical values of system parameters. The agreement between the experimental and theoretical results is found to be good.


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