The Simulation Studyabout Shell-and-tube Heat Exchanger In Different Baffles

The performance of heat exchanger is good or bad has very important influence onefficiency and economic benefits. The method of numerical simulation has becomeone of the important methods of internal flow and heat transfer features of heatexchanger because of the geometric structure and internal flow and heat transferprocess of heat exchanger is complex.This thesis used3-d numerical simulation tosimulate the baffle with angle,disk-and-doughnut baffle and ordinary single baffleshell-and-tube heat exchanger in the case of the structure of baffles plates changed.In this thesis, it used k-ε equation model as the calculation model which isprovided by FLUENT and computed by SIMPLE algorithm that is simple andefficient by sampling the complex model.The essence of heat exchanger is the process of energy transfer fluid through thewall of the tubes.During the research of energy exchanging,tube flow is bound tohave an impact on heat transfer,so it need a constant wall temperature calculationmethod to simulate hypothetical calculations.This thesis focuses on the simulation analysis about different structural changes.It analysised the changes about pressure,velocity and temperature of the angle with30°,60°,90°and plate spacing with100mm,150mm,200mm under the sameconditions of heat exchangers. Secondly,it simulated the physical properties curvesof disk-and-doughnut baffle in the same structure size and fluid conditions. Finally,itanalysised the changes of physical properties about the baffle with angle60°,disk-and-doughnut baffle with inner diameter of70mm and ordinary singlebaffle under the same plate spacing of200mm,it conclused that the optimal heatexchangers should be based on actual requirements.