Numerical simulation and experiment for R124-DMAC bubble absorption process in a vertical tubular absorber

摘要

A comparing investigation between the simulated model and experimental verifications for the R124 (2-chloro-l,l,l,2,-tetrafluoroethane)-DMAC (N', N'- dimethylacetamide) bubble absorption process in a vertical tubular absorber were performed. The objective of the investigation was to model the R124-DMAC bubble absorption process and to verify the model results with visual and non-visual experiments under similar operating conditions. The comparing results between the model and experiments were consistent well. The two-phase and single-phase convective heat transfer coefficient and two-phase mass transfer coefficient enhanced with increase of vapor and solution flow rates, and decreased with increase of solution inlet temperature, solution inlet mass fraction and nozzle orifice diameter. The two-phase mass transfer coefficient varied slightly with vapor flow rates rising. Finally, new correlations of the bubble absorption height, two-phase and single-phase convective heat transfer coefficients and two-phase mass transfer coefficient for R124-DMAC bubble absorption process in a vertical tubular bubble absorber were proposed. All of the correlation equations could predict about 90% of these parameters at a margin of error less than 15% under the operating conditions.