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
The responses of the flow-induced vibration of an elastic tube bundle subjected to the shell-side cross flow are investigated in this paper. The weak coupling method and the fluid solid interface are used to solve the...The responses of the flow-induced vibration of an elastic tube bundle subjected to the shell-side cross flow are investigated in this paper. The weak coupling method and the fluid solid interface are used to solve the fluid-structure interaction problem with consideration of the geometry and physical natures. The effects of the shell-side fluid flow velocity and the structural parameters on the flow-induced vibration are discussed. Numerical results demonstrate that the vibration frequency and amplitude at the monitor points increase with the increase of the shell-side water inlet velocity in all directions. The wall thickness and the external diameter of the elastic tube bundle have significant effects on the responses of the flow-induced vibration. The structural parameters affect the vibration frequency and amplitude, and the vibration equilibrium position in the water flow direction. The vibration frequency decreases with the increase of the tube external diameter. In addition, the vibration in the water flow direction has a lower equilibrium position when the elastic tube bundle has a larger wall thickness or smaller external diameter.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.
基金Project supported by the National Natural Science Foundation of China(Grant No.51475268)
文摘The responses of the flow-induced vibration of an elastic tube bundle subjected to the shell-side cross flow are investigated in this paper. The weak coupling method and the fluid solid interface are used to solve the fluid-structure interaction problem with consideration of the geometry and physical natures. The effects of the shell-side fluid flow velocity and the structural parameters on the flow-induced vibration are discussed. Numerical results demonstrate that the vibration frequency and amplitude at the monitor points increase with the increase of the shell-side water inlet velocity in all directions. The wall thickness and the external diameter of the elastic tube bundle have significant effects on the responses of the flow-induced vibration. The structural parameters affect the vibration frequency and amplitude, and the vibration equilibrium position in the water flow direction. The vibration frequency decreases with the increase of the tube external diameter. In addition, the vibration in the water flow direction has a lower equilibrium position when the elastic tube bundle has a larger wall thickness or smaller external diameter.
