Experimental study of film flow and heat/mass transfer in LiBr–H 2O solution flowing over a cooled horizontal tube

Abstract

Heat and mass transfer characteristics of thin-film flow of LiBr–H 2O solution over a single horizontal tube were examined experimentally and a useful set of the measured data were provided. Variables were the flow rate and temperature of the solution, absorber pressure, and the drainage pattern. The liquid film appeared wavy as the absorption rate became large; this could be achieved by decreasing the flow rate and the temperature of the solution and/or by increasing the absorber pressure. Absorption rate strongly depended on the absorber pressure when the solution flow rate was small, while on the solution temperature as the flow rate became large. The absorption performance was higher with the sheet-flow drainage for small flow rates; however, the reverse was true when the flow rate was increased.