Lithium Bromide Solution On The Corrugated Plate Falling Film Absorption Process Enhanced Heat And Mass Transfer

In this paper, research is focused on the heat and mass transfer features during absorption process on the two-scale corrugation plate surfaces of plate-shell heat exchangers. This new Kind structure has vertical large corrugations and horizontal small ones, which can enhance the convection heat transfer of cooling water at internal plate channel side and make the liquid falling film uniformly distributed and turbulent by twisting path, so that the heat and mass transfer characteristics at both sides can be enhanced while sufficient flow area for adequate resistance requirement is also met.Since the falling film absorption process is a complicated one with coupled heat and mass transfer, its mechanism is not fully understood SO far. It is quite different in heat and mass transfer for falling film absorption on the continuous corrugated plates and on separate tube banks, thus extent study on the subject should be necessary. In this paper theoretic and experimental researches on the heat and mass transfer on corrugated plate surfaces are carried out.Based on the analyses of heat and mass transfer characteristics of aqueous Lithium Bromide solution falling film absorption and consideration of some practical factors and parameter of plates, mathematical models of the heat and mass transkr of failing film absorption on the corrugated plates are established and numerical calculation performed, the results for velocity profile, temperature and concentration distribution fields inside the film are presented, and also the influence of some factors on heat and mass transfer performance is analyzed. The calculation results reveal that heat transfer coefficient, mass transfer coefficient, heat transfer rate and mass transfer rate will all increase with the sprinkle flow. Finally some calculation result curves of the heat and mass transfer coefficient versus the sprinkle now are presented.To verify the calculation models and the results, a series of experiments are performed, during which the heat and mass transfer performance on such plates as well as on the contrasted ordinary corrugation plates and plane ones were compared at different sprinkle flows. The results of experiments are presented, and discussion performed. The errors are comparatively small and within the engineering allowance.