帘式折流片换热器壳程流体流动和传热周期性充分发展区域长度界定研究  

Research on Define the Length of Periodic Fully Developed Region for Fluid Flow and Heat Transfer Characteristics in Shell Side of Shutter Baffle Heat Exchanger

作　　者：古新[1] 郝建设[1] 刘敏珊[1] 朱培纳[1] 

机构地区：[1]郑州大学河南省过程传热与节能重点实验室,河南郑州450002

出　　处：《高校化学工程学报》2014年第2期240-245,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51006092)

摘　　要：为了能清晰地了解帘式折流片换热器的壳程特性,采用数值模拟的方法对帘式折流片换热器三维实体模型壳程流体流动和传热性能进行研究。分别从压力梯度、无因次温度、速度三个主要特征,分析具有不同壳程流体流量,不同折流栅装配方式下帘式折流片换热器壳程流体流动与传热周期性充分发展区域的长度范围。在所研究范围内得出当折流栅同向装配时,流体在翻过第三块折流栅后到倒数第一块折流栅之间,流体的流动和传热为周期性充分发展状态;折流栅对称装配时,流体在翻过第二块折流栅后到倒数第一块折流栅之间为周期性充分发展段。帘式折流片换热器几何结构一定的情况下,周期性充分发展区域的长度与壳程流体流量的变化无关。The characteristics of fluid flow and heat transfer in the shutter baffle heat exchanger werenumerical studied. In the numerical simulations, the 3D whole entity model was adopted to reveal thecharacteristics of fluid flow and heat transfer in shell side in detail. Three main characteristics of pressuregradient, dimensionless temperature and fluid velocity contours were selected to ascertain the length of periodicfully developed section of the heat exchanger with different shutter baffle assembly modes. The influences offluid velocity in the shell side and shutter baffle assembly modes were analyzed. It was concluded that, for theheatexchanger with shutter baffles assembled concurrently the fluid flow and heat transfer are periodic in themiddle section between the third shutter baffle counted from inlet and the first shutter baffle counted reverselyfrom outlet, and fluid flow and heat transfer are periodic in the middle section between the second shutter bafflecounted from inlet and the first shutter baffle counted reversely from outlet for the heat exchanger with bafflesymmetrical assembly mode. The length of periodic fully developed section of fluid flow and heat transfer isindependent on the fluid flow rate in the shell side.

关 键 词：数值模拟 帘式折流片 进出口段 周期性充分发展 

分 类 号：TQ051.5[化学工程] TK172[动力工程及工程热物理—热能工程]