CAJ | 학술논문

对一种具有并流多通道进出口结构(MPC)的轴流管壳式换热器的壳程局部传热性能进行实验研究,分别在有壳程进口段分布挡板与无分布挡板的情况下,探讨了进口段局部表面传质努塞尔数的分布、局部平均表面努塞尔数与管束位置及雷诺数的关系,分析了进口段和换热器整体的平均传质努塞尔数与雷诺数的变化关系,揭示了壳程进口段的局部表面努塞尔数的分布规律,并进行了机理分析.研究结果表明,分布挡板能够有效促进壳程流场的分布,提高换热器壳程的整体传热性能.
대일충구유병류다통도진출구결구(MPC)적축류관각식환열기적각정국부전열성능진행실험연구,분별재유각정진구단분포당판여무분포당판적정황하,탐토료진구단국부표면전질노새이수적분포、국부평균표면노새이수여관속위치급뢰낙수적관계,분석료진구단화환열기정체적평균전질노새이수여뢰낙수적변화관계,게시료각정진구단적국부표면노새이수적분포규률,병진행료궤리분석.연구결과표명,분포당판능구유효촉진각정류장적분포,제고환열기각정적정체전열성능.
In this paper, the local heat transfer performance of the shell side of an axial-flow shell-and-tube heat exchanger with multi-parallel-channel inlet/outlet (MPC) was experimentally studied, with or without distributed baffles being set in the inlet region at the shell side. The investigation includes such aspects as (1) the distribution of local surface Nusselt number (Nu) in the inlet region;(2) the correlation between the local-mean surface Nusselt number and the tube bundle location as well as the Reynolds number (Re);(3) the variations of mean Nusselt number and Reynolds number of the inlet region and the heat exchanger;(4) the distribution rule of the local surface Nusselt number of the inlet region at the shell side;and (5) a reasonable mechanism analysis of the above-mentioned statements. The results indicate that distributed baffles effectively improve the fluid flow distribution and enhance the overall heat transfer performance of the shell side of the heat exchange.