环形通道内置螺旋线圈过冷流动沸腾传热特性

doi:10.3969/j.issn.0438-1157.2012.10.012

化工学报 ›› 2012, Vol. 63 ›› Issue (10): 3086-3093.DOI: 10.3969/j.issn.0438-1157.2012.10.012

环形通道内置螺旋线圈过冷流动沸腾传热特性

罗林聪, 张冠敏, 田茂诚, 唐玉峰, 潘继红

山东大学能源与动力工程学院, 山东济南 250061

收稿日期:2011-11-19 修回日期:2012-06-05 出版日期:2012-10-05 发布日期:2012-10-05
通讯作者: 田茂诚
作者简介:田茂诚,罗林聪(1987- ),男,博士研究生。
基金资助:
山东省科技攻关项目(2008GG10007009,2007 GG30007001);山东大学自主创新基金项目(2009TS051)。

Heat transfer characteristics of subcooled flow boiling in vertical annuli with wire coil inserts

LUO Lincong, ZHANG Guanmin, TIAN Maocheng, TANG Yufeng, PAN Jihong

School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China

Received:2011-11-19 Revised:2012-06-05 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by Shandong Province Key Scientific and Technological Project(2008GG10007009,2007GG30007001) and the Independent Innovation Foundation of Shandong University(2009TS051).

摘要/Abstract

摘要： 研究了置有螺旋线圈的内管加热环形通道中水的过冷流动沸腾传热特性。环形通道由铜制加热棒外套石英玻璃管构成,不同螺旋节距和线丝直径构成的5种螺旋线圈用于实验。对每种置入螺旋线圈管和光滑管分别进行了不同质量流速和热负荷下的16组实验,分析了线丝直径和线圈节距对传热系数的影响规律及机理。结果表明,螺旋线圈存在能使流体发生旋转分离,且使汽化核心密度增大,从而有效强化过冷沸腾换热;传热系数随着线圈节距的减小、线丝直径的增加,即节径比(P/e)减小而增大,当P/e最小为1.5时强化效果最好;最佳强化换热性能较光滑管的高出109%。将实验数据与4个经验关系式的预测值进行了比较,并给出了不同工况下各实验管的强化系数对比。

关键词: 螺旋线圈, 环形通道, 过冷沸腾, 强化系数, 经验关系式

Abstract: Heat transfer characteristics of subcooled flow boiling water were experimentally investigated in a vertical evaporator with wire coil inserted.The evaporator was an annular channel consisted of an inner heater rod and an outer quartz pipe.Five kinds of helically wire coils with different coil pitches and different wire diameters were made and used in full length of the heated rod.For each inserted tube and the plain tube,16 testing runs were carried out with different mass velocities and heat fluxes separately.The influences of wire diameter and coil pitch on heat transfer coefficients were investigated and the mechanism was analyzed.The results indicate that the presence of wire coil causes the spiral and separation of fluid,increasing the nucleation site density in nucleate boiling and enhancing the subcooled boiling heat transfer.The heat transfer coefficients increases as the coil pitch decreases and as wire diameter increases,namely as pitch diameter ratio(P/e)reduces.The enhancement effect for the minimum 1.5 of P/e is the best.The maximum heat transfer enhancement of the wire coil inserted tubes over the plain tube is 109%. Four correlations are assessed by the mean absolute error based on the experimental data.The enhancement factor of the coiled wire inserted annuli is given in the form of diagram under different operation conditions.

Key words: shelically wire coil, annular channel, subcooled boiling, enhancement factor, empirical correlation

中图分类号:

TK124

罗林聪, 张冠敏, 田茂诚, 唐玉峰, 潘继红. 环形通道内置螺旋线圈过冷流动沸腾传热特性[J]. 化工学报, 2012, 63(10): 3086-3093.

LUO Lincong, ZHANG Guanmin, TIAN Maocheng, TANG Yufeng, PAN Jihong. Heat transfer characteristics of subcooled flow boiling in vertical annuli with wire coil inserts[J]. CIESC Journal, 2012, 63(10): 3086-3093.

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环形通道内置螺旋线圈过冷流动沸腾传热特性

Heat transfer characteristics of subcooled flow boiling in vertical annuli with wire coil inserts

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