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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

THE EFFECT OF HUMIDITY ON THE HEAT AND MASS TRANSFER ACROSS NARROW VERTICAL AIR SPACES

Get access (open in a dialog) DOI: 10.1615/IHTC11.270
pages 157-162

Sinopsis

An analytic solution for the temperature, mass fraction and velocity profiles between infinite vertical walls is used to investigate the effect of humidity on the energy transfer across a narrow air gap. It is shown that the enthalpy transported by the water vapour can be the dominant contribution to the overall energy transfer rate. Other mass transfer effects (interfacial velocity and species interdiffusion) tend to distort the gradients of temperature and mass fraction in the cavity. This alters the heat and mass transfer rates, particularly at higher temperatures. A similarity in the form of the results to those of "film theory" suggests an extension of the results to arbitrary aspect ratios.