Heat and mass transfer from a horizontal tube of an evaporative heat dissipator |
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| Affiliation: | 1. Department of Aerospace Engineering, Defence Institute of Advanced Technology, Pune, 411025, India;2. The Centre for Fluid Dynamics, Department of Mechanical Engineering, Indian Institute of Technology Indore, 453552, India;3. Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada |
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| Abstract: | In this investigation, the mass transfer coefficient with simultaneous water and air flow has been determined experimentally. The coefficient has also been calculated theoretically from the convective heat transfer coefficient of air by applying the Lewis relation for an air-water mixture. The ratio of experimental to theoretical mass transfer coefficients has been found to lie between 0.80 to 9.35. A new term ‘evaporative effectiveness’' is defined as the ratio of energy dissipated in evaporative cooling to that in simple water cooling. Its variation is studied and found to range from 0.85 to 1.78. Correlations for design purposes are recommended in this paper. |
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