Numerical Simulation Of Shell-side Fluid-flow In The Shell-and-tube Heat Exchanger

Heat exchanger is the equipment that make heat transferred from hot fluid to cool fluid,it is widely used in industrial circles like petroleum,chemical engineering.Shell-and-tube heat exchanger is common used in industrial circles for simple structure,fully-fledged designed and worked,highly safety,applicability and so on. So the research in shell-side flows of shell-and-tube heat exchanger has significant meaning for improving heat transfer,enhancing efficiency and reducing energy consumption.This paper regards large-scale shell-and-tube heat exchanger as the research object,shell-side flows of heat exchangers with single and double segmental baffles or disco and doughnut baffles are simulated numerically.And the way for increasing the accuracy simulated is analyzed.First, the structure of shell side is analyzed, geometry model is established.The method is brought forward, which is used to divided shell-side model into several sections,and sections are simulated separately.Shell-side flow of models with single segment baffles is simulated, to which standard k ?εmodel,wall functions and SIMPLE are applied.The results show that the larger baffle cut, the wider fluid detention areas which are caused in front of baffles and back,and pressure drop of the models whose tubes are arrayed by regular triangle is biggest.In a similar way,the models with double segment and disco and doughnut baffles are simulated.It shows that dead flow angles are well eliminated in the shell side because of the usage of two kinds of baffles,and pressure drop of the models whose tubes are arrayed by regular triangle is also biggest.The properties of flow field for shell-side models with three kinds of baffles are analyzed and contrasted.The results show that flow field for shell-side models with single segment baffles exist different size flow dead singles;pressure drops of the models are bigger.For the models with double segment and disco and doughnut baffles,their properties of flow field are better than models with single segment baffles;pressure drops of the models are smaller,pressure drops of models with double segment baffles are smallest among them.