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不连续斜肋强化传热管的数值模拟

发表时间:2013-09-30  浏览量:1130  下载量:334
全部作者: 施坤,刘伟,刘志春
作者单位: 华中科技大学能源与动力工程学院
摘 要: 对管壳式换热器中使用的换热管进行研究,试图通过减小流体的流动阻力,提高换热器的综合换热性能。首先,提出不连续双斜向内肋管(discrete double-inclined ribs tube,DDIR)的设计方法,设计了壁面上带有双斜肋的换热管模型。然后,从3个方面改进设计,以尽可能地减少流动阻力,提高综合换热性能:一是将斜肋沿圆周的布置方式由交叉排列改为平行顺排;二是将斜肋沿流动方向的排列方式由顺排改为叉排;三是将斜肋向管壁面内倾斜凹入的方式由两端均深改为逐渐深入,设计了多种管壁面凹入圆柱形斜肋的强化传热管模型。以水为工质,对层流状态进行数值模拟,并将考虑减阻前后的模型数值结果进行对比,结果表明:斜肋沿流向的凹入方式采用逐渐加深的方式,能有效减少流动阻力,提高综合换热效果。
关 键 词: 节能技术;强化换热;斜肋;性能评价准则;效能评价准则;数值模拟
Title: Numerical studies on heat transfer and friction factor characteristics of discrete inclined ribs tubes
Author: SHI Kun, LIU Wei, LIU Zhichun
Organization: School of Energy and Power Engineering, Huazhong University of Science and Technology
Abstract: In this paper, a research on the heat transfer tube which is used widely in shell and tube heat exchanger was performed. The fluid flow resistance was tried to be reduced to improve the heat transfer performance. According to discrete double-inclined ribs tube (DDIR), which had been mentioned in the existing literature, heat transfer tube with cross inclined ribs was designed. Then, in order to minimize the flow resistance, and improve the overall heat transfer performance, the model design method was improved from three aspects: 1) Inclined ribs arrangement circumferentially was changed to parallel; 2) Inclined ribs arrangement along the flow direction was changed to staggered; 3) The way how the inclined ribs plunged into the wall surface was changed from both ends deep to gradually deepening. Numerical calculation on laminar flow was conducted, and the results were compared. The numerical results of different kinds of models were compared, and the results show that the inclined ribs in a gradual deepening mode can effectively reduce the flow resistance, and improve the overall effect of heat transfer.
Key words: energy-saving technology; heat transfer enhancement; inclined ribs; performance evaluation criteria; efficiency evaluation criteria; numerical simulation
发表期数: 2013年9月第18期
引用格式: 施坤,刘伟,刘志春. 不连续斜肋强化传热管的数值模拟[J]. 中国科技论文在线精品论文,2013,6(18):1733-1738.
 
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