RESEARCH PAPERS: Evaporation, Boiling, and Condensation

A Theoretical Study on Convective Condensation of Water Vapor From Humid Air in Turbulent Flow in a Vertical Duct

[+] Author and Article Information
V. Dharma Rao1

Department of Chemical Engineering, College of Engineering,  Andhra University, Visakhapatnam-53003, Indiav.dharmarao@yahoo.com

V. Murali Krishna

Department of Mechanical Engineering,  G.V.P. College of Engineering, Visakhapatnam-530041, Indiamḵvemula@rediffmail.com

K. V. Sharma

Department of Mechanical Engineering,  JNTU, Kukatpally, Hyderabad-500072, Indiakvsharmajntu@yahoo.com

P. K. Sarma

 GITAM, Rishikonda, Visakhapatnam-530045, Indiasarmapk@yahoo.com


Corresponding author.

J. Heat Transfer 129(12), 1627-1637 (Apr 01, 2007) (11 pages) doi:10.1115/1.2767678 History: Received November 09, 2006; Revised April 01, 2007

The problem of condensation of water vapor from humid air flowing in a duct in turbulent flow is formulated theoretically. Vapor condensing at the dew-point temperature of the vapor-air mixture diffuses to the wall of the duct through an air film. The flow of the condensate is laminar. The condensing vapor releases both convection and latent heats to the wall of the duct. Thus, it is treated as a combined heat and mass transfer problem. The mass, momentum, and energy balance equations for the vapor-air mixture flowing in the duct and the diffusion equation for the vapor species are considered. Ti, the temperature at gas-to-liquid interface, at which condensation takes place, is estimated with the help of the heat balance and mass balance equations at interface. The local and average values of the condensation Nusselt number, condensate Reynolds number, gas-liquid interface temperature, and pressure drop are estimated from the numerical results for different values of the system parameters, such as relative humidity and temperature of air at inlet, gas phase Reynolds number, and total pressure at inlet. The gas phase convection Nusselt and Sherwood numbers are also computed. A comparison of the present work with experimental data, for the case of in-tube condensation of vapor from humid air, shows satisfactory agreement.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Physical model and configuration

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Figure 2

Comparison of present work with experimental data

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Figure 3

Effect of Reg,0, T0, RH,0, and P0 on Nul,z and (hgW∕kl)

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Figure 4

Effect of various parameters on local condensate Reynolds number

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Figure 5

Gas-liquid interface temperature (Ti); effect of different parameters

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Figure 6

Effect of Reg,0, T0, and RH,0 on local gas-vapor mixture pressure

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Figure 7

Effect of RH,0 on average condensate Nusselt and condensate Reynolds number

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Figure 8

Effect of RH,0 on average gas-liquid interface temperature and total pressure drop

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Figure 9

Variation of Nul,av, (Shg,avxk+) and (Rel,e) with Reg,0

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Figure 10

Effect of Reg,0 on average interface temperature and total pressure drop

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Figure 11

Effect of P0 on Nul,av and Rel,e




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