Research Of Heat Exchange Performance Of Shell-and-tube Heat Exchanger Based On Baffle Structure

The use of CFD simulation technology has been one of the common methods to optimize the performance of heat exchangers.According to reasonable assumptions,A simplified model of the shell-and-tube heat exchanger was established.The FLUENT software was used to numerically simulate the flow field and temperature field of the heat exchanger shell-side fluid under different inlet velocity conditions.For a heat exchanger with the baffle number of 8 and horizontal direction of the incision,the error between the shell-side outlet temperature obtained by the numerical simulation and the actual shell-side outlet temperature was-1.42% in the case of a shell inlet flow rate of 1 sm,which was within the allowable range.Thus,the simulation result is correct.The j-ffactor evaluation method was used as the criterion of heat transfer performance of heat exchanger.The influence of the different baffles number and the cut direction on the heat transfer coefficient,pressure drop and comprehensive heat transfer performance of the heat exchanger were emphatically analyzed.The results show that the heat transfer coefficient and pressure drop of the heat exchanger were added with the increase of the number of baffles and the inlet flow rate of the shell side.When the number of baffles was 8 and the shell inlet flow rate was 1.5 sm,the heat exchanger has the best heat transfer performance.The larger the direction angle of the baffle cut,the smaller the heat transfer coefficient and the shell-side pressure drop of the heat exchanger.When the direction of the plate is 45 degrees and the inlet velocity of the shell is 1.5m/s,the heat transfer performance of the heat exchanger is the excellent.