Abstract:

In order to make up the drawback of small gap modeling and analysis in current shell & tube heat exchanger numerical simulation on fluid flow and heat transfer，the full fluid flow and heat transfer mode，which contains the main flow stream of B，C and small leakage flow stream of A and E，is developed by the simulation method of “segmented modeling and comprehensive synthesis” that successfully incorporate the small leakage flow stream of A and E paths. The full fluid flow and heat transfer mode are consistent with the actual heat exchanger. The fluid flow and heat transfer is studied in the segmentation model by using CFD software；and the influence of these flow passages in the baffle space on the fluid flow and heat transfer are also discussed. Data of local flow and heat transfer from numerical simulation are further processed comprehensively to get the integrated correlation performance of heat transfer and pressure drop in heat exchanger. The numerical results are compared with several famous formulas，such as method of Donohue，Kern，Bell-Delaware and Flow Stream Analysis. It is shown that the simulation results are well agreed with Bell-Delaware and Flow Stream Analysis Method，the maximum deviation is less than 20%.