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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.
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. 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 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 the decrease in FHE by 12% -20% and the 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 a re superior to that of CHEs.