Evaporative Effectiveness & Mass Transfer Coefficient of A U-Shape Brass Tube of an Evaporative Heat Exchanger
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2014, Vol 2, Issue 8
Abstract
The results of this experimental investigations on evaporative effectiveness and mass transfer coefficient of U shape brass tube of an evaporative heat exchanger are offered in this thesis report. The U shape brass tube is subjected to flow of water only & concurrent flows of cooling water from the top; air flows from the underneath and the process fluid are flowing through the tubes. Evaporative effectiveness and mass transfer coefficient are estimated within following range of operating variables Reynolds number of water223 ≤ Rew≤ 1032. Reynolds number of air 2460 ≤ Rea ≤ 8059. It is reported that the increase in evaporative effectiveness is found with slight stagnation with increase of Reynolds number of water and Reynolds number of air. Evaporative effectiveness and mass transfer coefficient decreases with increase of Dimensionless enthalpy potential. The percentage increase in Evaporative effectiveness with increase in Reynolds number of water is from 9. 23% to 14.72% Mass transfer coefficient increases almost proportional to increment in film Reynolds number of water and Reynolds number of air. The percentage increase in mass transfer coefficient with increase in Film Reynolds number is from 80.94 % to 108.50 %. Based on the experiments correlations derived using the multiple regression analysis. The present empirical results show good agreement with the experimental results. Developed correlations are helpful in improvement of the design of heat transfer devices and many other engineering applications.
Authors and Affiliations
Sachin Duhan, Raj Kumar
Keywords
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