Recent Advances in the Performance Rules of Falling Film Heat Exchanger over Horizontal Tubes
The falling film heat exchanger over horizontal tubes has the advantages of high heat and mass transfer efficiency,low resistance,simple structure and so on.It is widely used in traditional fields such as chemical industry and field of energy conservation and emission reduction of energy utilization.Complex coupling flow and heat and mass transfer processes are occured in falling film heat exchanger.The progress of experimental and numerical simulation research methods was reviewed.The multiple influences of different operating parameters(such as gas temperature,gas flow direction,gas flow rate,solution flow rate,solution temperature,solution concentration,internal media flow rate and temperature)and structural parameters(such as tube diameter and tube spacing)on flow characteristics of falling film over horizontal tubes were reviewed,such as intertube flow pattern,liquid film thickness and wettability,etc.And the influence rules on the performance of heat exchangers such as evaporative heat transfer characteristics and absorptive heat and mass transfer characteristics were reviewed,including the overall performance and local fine characteristics,which provided theoretical support for improving the performance optimization of falling film heat exchangers over horizontal tubes.It was pointed out that the coupling effects of multi-dimensional local flow and heat and mass transfer performance under different gas flow characteristics and multi-factor interaction as well as strengthening heat transfer means will be theresearch direction of falling film heat exchangers over horizontal tube in the future.
horizontal tube falling filmintertube flow patternliquid film thicknesswettabilityheat and mass transfer
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