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首页> 外文期刊>Heat Transfer Engineering >Study on Flow and Heat Transfer Characteristics of Vapor-Liquid Two-Phase Flow in a Narrow Rectangular Channel With Longitudinal Vortex Generators
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Study on Flow and Heat Transfer Characteristics of Vapor-Liquid Two-Phase Flow in a Narrow Rectangular Channel With Longitudinal Vortex Generators

机译：纵向涡流发生器在窄矩形通道内气液两相流的流动和传热特性研究

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摘要

The heat transfer enhancement of the longitudinal vortex (LV) is a kind of technology with high efficiency and low thermal resistance. An LV is produced by longitudinal vortex generators (LVGs). Due to their relative long influence distance and simple structure, the LVGs may be used in narrow channels with a flat surface. In this paper, the dimension of a narrow rectangular channel is 600 mm (length) x 40 mm (width) x 3 mm (height), and one LVG is 14 mm (length) x2.2 mm (width) x 1.8 mm (height). The rectangular blocked LVGs are periodically laid out in the heated plate, and the attack angle of LVGs is 44°, the longitudinal pitch between LVGs is 100 mm, and the transverse pitch between LVGs is 4 mm. The test section is visual with three surfaces and heated with one surface by direct current. The working fluid is water. The experimental results show that the boiling heat transfer coefficient on the heated surface is increased by 25.8%, while the pressure drop along the test section is increased by 50.6%. At the same time, the visual experimental data shows that the bubbles' behavior has been intensively affected by LVs, the growth and gathering of bubbles have been depressed, and the thermal boundary layer in the test section has been greatly damaged and reduced; as results, the momentum and energy exchange in the test section have been strengthened. Thus, the heat transfer is obviously enhanced by LVs.
机译：纵向涡流（LV）的传热增强是一种高效且低热阻的技术。 LV由纵向涡流发生器（LVG）产生。由于其相对长的影响距离和简单的结构，LVG可以用于具有平坦表面的狭窄通道中。在本文中，一个狭窄的矩形通道的尺寸为600毫米（长）x 40毫米（宽）x 3毫米（高），一个LVG为14毫米（长）x2.2毫米（宽）x 1.8毫米（高度）。矩形封闭的LVG周期性地布置在加热板上，LVG的迎角为44°，LVG之间的纵向间距为100mm，LVG之间的横向间距为4mm。测试部分是具有三个表面的外观，并由直流电加热到一个表面。工作流体是水。实验结果表明，受热面的沸腾传热系数增加了25.8％，而沿试验段的压降增加了50.6％。同时，直观的实验数据表明，LVs严重影响了气泡的行为，抑制了气泡的生长和聚集，大大破坏和减少了测试区的热边界层。结果，测试部分的动量和能量交换得到了加强。因此，LVs明显增强了热传递。

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  • 来源
    《Heat Transfer Engineering》 |2011年第12期|p.1053-1061|共9页
  • 作者

    YANPING HUANG; JUN HUANG; JIAN MA; QIUWANG WANG;

  • 作者单位

    National Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China, Chengdu, China;

    National Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China, Chengdu, China,State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy & Power Engineering Xi'an Jiaotong University, Xi'an, China;

    National Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China, Chengdu, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy & Power Engineering Xi'an Jiaotong University, Xi'an, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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