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Abstract In an attempt to improve surface wetting and coating characteristics, a novel technique, i.e., imposing ultrasonic vibration on the substrate, is introduced. This technique is combined with conventional ultrasonic [...]

Abstract This work presents the results of simple but effective experiments designed and performed to study the characteristics of coatings made by air-assist spray deposition of a food-dye solution on [...]

Byline: Morteza Eslamian, Ali Heydari, Parichehr Ghezelbash In this paper, entropy generation in heat exchangers used in Indirect Evaporative Coolers (IDECs) is studied. First, expressions for the rate of entropy generation in tube-type and plate-type cross-flow heat exchangers used as IDECs are obtained. Then, by introducing appropriate geometric constraints and employing thermohydraulic design equations, the variation of the rate of entropy generation within the heat exchangers is investigated. The maximum EER, outlet temperatures and the optimum sizes are obtained for several cases. The results of several experiments conducted on an optimum tube-type experimental prototype are presented and compared with the numerical data.

A study is conducted to investigate the effect of various atomization methods and solute concentration on the morphology of spray dried magnesium sulphate particles. Findings suggest that obtaining fully filled magnesium sulphate particles is difficult because the solution equilibrium saturation is substantially changing with temperature.