Influence of Decentration Phenomenon of Heat Exchange Tube of Shell-and-tube Heat Exchanger on Heat Transfer Performance
In shell-and-tube heat exchanger,the baffle-tube clearance between the heat exchange tube and the baffle.During the installation and running of shell-and-tube heat exchanger,the heat exchange tube inevitably deviates the central position of baffle aperture,as a result,the decentration phenomenon of heat exchange tube appears.The numerical simulations are carried out by using CFD code FLUENT software to study the characteristics of fluid flow and heat transfer in shell side and tube pass under different conditions.The standard k-e turbulent model and SIMPLE method were used in calculations,and the pressure equation is of standard format.This paper analyzes the influence of eccentricity on heat transfer performance from three aspects:pressure drop,temperature and transfer effectiveness of outlet medium of shell-and-tube heat exchanger.The simulation results are introduced into the evaluation index of heat exchanger to optimize the design of shell-and-tube heat exchanger,improve heat exchange efficiency,reduce energy consumption and production cost,thus improving production efficiency.
Shell-and-Tube Heat ExchangerNumerical SimulationDecentration Phenomenon of Heat Exchange TubeEvalua-tion Index
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