Heat and mass transfer characteristics of R124-DMAC bubble absorption in a vertical tube absorber

Experimental investigation for a visual vertical tubular bubble absorber was done with R124 (2-chloro-l,l,l,2,-tetrafluoroethane)-DMAC (N′,N′- dimethylacetamide) as working fluid. The objective of this investigation was to obtain key parameters that affect on the heat and mass transfer performance of R124-DMAC bubble absorption, such as vapor and solution flow rates, solution inlet temperatures and mass fractions, and nozzle orifice diameters. The results showed that the overall heat and volumetric mass transfer coefficients increased with increase of vapor and solution flow rates, and decreased with increase of solution inlet temperatures and mass fractions, and the nozzle orifice diameter. Especially, solution inlet mass fractions and the nozzle orifice diameter significantly influenced on mass transfer performance, while solution inlet temperatures and vapor flow rates influenced greatly on the heat transfer performance. A correlation of Sherwood number for R124-DMAC mixture in a visual vertical tubular bubble absorber was provided by the method of multiple linear regressions. The error band from the present study was within ±15%.