The fluid flow and heat transfer of the shell-side in one type of flat-tube heat exchangers（FHE） were studied through numerical simulation and experimental methods.In the numerical simulation,hot/cold air was set as...The fluid flow and heat transfer of the shell-side in one type of flat-tube heat exchangers（FHE） were studied through numerical simulation and experimental methods.In the numerical simulation,hot/cold air was set as working fluid,and the standard k-ε turbulence model supplemented by boundary conditions was used,and also the control volume method was used to the discrete control equations.Compared with the same type of circular-tube heat exchangers（CHE）,the numerical simulation results show that the pressure drop at the shell-side of FHE decreases by 12%-20%,and heat transfer coefficient increases by about 24%.The coefficient of integral performance Nu/ζ 0.29 has an increment of 22%-34%.Under the same conditions,the experimental results of temperature and the overall pressure drop show that the deviation percentage with those of numerical simulation are less than 8% and 25%,respectively.Both results verify that the heat transfer efficiency and flow resistance characteristics of FHEs are superior to that of CHEs.展开更多
基金Supported by the National Natural Science Foundation of China (50906065)the Program for Excellent Young and Middle-Aged Researchers in Hubei Province (Q20081508)the Youth Science Foundation of Wuhan Institute of Technology (WIT_Q2008007)
文摘The fluid flow and heat transfer of the shell-side in one type of flat-tube heat exchangers（FHE） were studied through numerical simulation and experimental methods.In the numerical simulation,hot/cold air was set as working fluid,and the standard k-ε turbulence model supplemented by boundary conditions was used,and also the control volume method was used to the discrete control equations.Compared with the same type of circular-tube heat exchangers（CHE）,the numerical simulation results show that the pressure drop at the shell-side of FHE decreases by 12%-20%,and heat transfer coefficient increases by about 24%.The coefficient of integral performance Nu/ζ 0.29 has an increment of 22%-34%.Under the same conditions,the experimental results of temperature and the overall pressure drop show that the deviation percentage with those of numerical simulation are less than 8% and 25%,respectively.Both results verify that the heat transfer efficiency and flow resistance characteristics of FHEs are superior to that of CHEs.
