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管带式换热器空气侧传热传质与阻力性能的准则关联式 被引量:7
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作者 刘维华 陈芝久 《流体机械》 CSCD 北大核心 1994年第10期60-63,共4页
报道了管带式换热器空气侧换热及阻力性能的实验结果,给出了计算空气侧换热系数、析湿系数与流动阻力的准则关联式。这些公式的可信度较高,可在工程设计中应用。
关键词 管带式换热器 换热 准则关联式
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车用水散热器分析及其改进 被引量:2
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作者 张力 叶物泰 《车辆与动力技术》 1997年第2期14-17,共4页
本文在对水散热器的基本结构、传热热阻、散热带局部放热系数等问题进行分析的基础 上得出:对于目前车辆常用的水散热器,其散热带、水管的热阻与重量之间存在着极不匹配的关 系,提出了开发、研制高效能的散热元件是提高散热器性能、... 本文在对水散热器的基本结构、传热热阻、散热带局部放热系数等问题进行分析的基础 上得出:对于目前车辆常用的水散热器,其散热带、水管的热阻与重量之间存在着极不匹配的关 系,提出了开发、研制高效能的散热元件是提高散热器性能、减少体积、减轻重量、节约原材料的有 效途径,是研制开发重型车辆用高效紧凑散热器技术的核心和基础. 展开更多
关键词 管带式换热器 散热 冷却
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Thermal performance of tubular heat exchanger with multiple twisted-tape inserts 被引量:9
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作者 Suriya Chokphoemphun Monsak Pimsarn +1 位作者 Chinaruk Thianpong Pongjet Promvonge 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第5期755-762,共8页
The paper presents an experimental investigation on enhanced heat transfer and pressure loss characteristics by using single, double, triple, and quadruple twisted-tape inserts in a round tube having a uniform heat-fl... The paper presents an experimental investigation on enhanced heat transfer and pressure loss characteristics by using single, double, triple, and quadruple twisted-tape inserts in a round tube having a uniform heat-fluxed wall. The investigation has been conducted in the heat exchanger tube inserted with various twisted-tape numbers for co- and counter-twist arrangements for the turbulent air flow, Reynolds number (Re) from 5300 to 24000. The typical single twisted-tape inserts at two twist ratios, y/w = 4 and 5, are used as the base case, while the other multiple twisted-tape inserts are aty/w = 4 only. The experimental results of heat transfer and pressure drop in terms of Nusselt number (Nu) and friction factor 00, respectively, reveal that Nu increases with the increment of Re and of twisted-tape number. The values of Nu for the inserted tube are in a range of 1.15-2.12 times that for the plain tube while f is 1.9-4.1 times. The thermal enhancement factor of the inserted tube under similar pumping power is evaluated and found to be above unity except for the single and the double co-twisted tapes. The quadruple counter-twisted tape insert provides the maximum thermal performance. 展开更多
关键词 Thermal performance Twisted tape arrangement Turbulator Nusselt number Friction factor
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Influence of Double-sided Delta-wing Tape Insert with Alternate-axes on Flow and Heat Transfer Characteristics in a Heat Exchanger Tube 被引量:1
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作者 Smith Eiamsa-ard Pongjet Promvonge 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第3期410-423,共14页
The convective heat transfer and friction behaviors of turbulent tube flow through a straight tape with double-sided delta wings(T-W)have been studied experimentally.In the current work,the T-W formed on the tape was ... The convective heat transfer and friction behaviors of turbulent tube flow through a straight tape with double-sided delta wings(T-W)have been studied experimentally.In the current work,the T-W formed on the tape was used as vortex generators for enhancing the heat transfer coefficient by breakdown of thermal boundary layer and by mixing of fluid flow in tubes.The T-W characteristics are(1)T-W with forward/backward-wing arrangement,(2)T-W with alternate axis(T-WA),(3)three wing-width ratios and(4)wing-pitch ratios.The experimental result reveals that for using the T-W,the increases in the mean Nusselt number(Nu)and friction factor are,respectively,up to 165%and 14.8 times of the plain tube and the maximum thermal performance factor is 1.19.It is also obvious that the T-W with forward-wing gives higher heat transfer rate than one with backward-wing around 7%. The present investigation also shows that the heat transfer rate and friction factor obtained from the T-WA is higher than that from the T-W.In addition,the flow pattern and temperature fields in the T-W tube with both backward and forward wings were also examined numerically. 展开更多
关键词 fluid flow heat transfer tape with centre-wing WING alternate axis vortex
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