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首页> 外文期刊>International Journal of Heat and Mass Transfer >Pool boiling characteristics of multiwalled carbon nanotube (CNT) based nanofluids over a flat plate heater
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Pool boiling characteristics of multiwalled carbon nanotube (CNT) based nanofluids over a flat plate heater

机译：平板加热器上基于多壁碳纳米管（CNT）的纳米流体的池沸腾特性

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摘要

This paper is mainly concerned about the pool boiling heat transfer behavior of multi-walled carbon nanotubes (CNTs) suspension in pure water and water containing 9.0% by weight of sodium lauryl sulphate anionic surfactant (SDS). Three different concentrations of 0.25%, 0.5% and 1.0% by volume of CNT dispersed with water and water containing 9.0% by weight of sodium lauryl sulphate anionic surfactant (SDS) were prepared and boiling experiments were conducted over a stainless steel flat plate heater of size 30 mm~2 and 0.44 mm thickness. The test results exhibit that the addition of carbon nanotubes increases boiling heat transfer coefficients of the base fluids. At a given heat flux of 500 kW/m~2, the enhancement of heat transfer coefficient was found to be 1.5, 2.6 and 3.0 times of water corresponding to 0.25%, 0.5% and 1.0% concentration of CNT by volume in water, respectively. In water-CNT-surfactant nanofluid, it was found that 0.5% of CNT concentration gives the highest enhancement of 1.7 compared with water. In both water and water-surfactant base fluids, it was observed that the enhancement factor for 0.25% of CNT first increases up to the heat flux of 66 kW/m2 and then decreases for higher heat fluxes. Further, the overall heat transfer coefficient enhancement in the water-CNT nanofluids is approximately two times higher than that in the water-CNT-surfactant nanofluids. With increasing heat flux, however, the enhancement was concealed due to vigorous bubble generation for both water-CNT and water-CNT-surfactant nanofluids. Foaming was also observed over the liquid-free surface in water-CNT-surfactant nanofluids during the investigation. No fouling over the test-section surface was observed after experimentation.
机译：本文主要关注多壁碳纳米管（CNTs）悬浮液在纯水和含9.0重量％月桂基硫酸钠阴离子表面活性剂（SDS）的水中的池沸腾传热行为。制备了三种不同浓度的0.25％，0.5％和1.0％（体积）的CNT，分散在水中和含有9.0％（重量）月桂基硫酸钠阴离子表面活性剂（SDS）的水，并在不锈钢平板加热器上进行沸腾实验。尺寸30 mm〜2和0.44 mm的厚度测试结果表明，碳纳米管的添加增加了基液的沸腾传热系数。在给定的500 kW / m〜2的热通量下，传热系数的提高是水的1.5倍，2.6倍和3.0倍，分别对应于CNT的0.25％，0.5％和1.0％的CNT浓度。 。在水-碳纳米管表面活性剂纳米流体中，发现与水相比，碳纳米管浓度为0.5％时，最高增强值为1.7。在水和水表面活性剂基液中，都发现0.25％CNT的增强因子首先增加到热通量66 kW / m2，然后在更高的热通量下降低。此外，水-CNT纳米流体中的总传热系数提高约比水-CNT表面活性剂纳米流体中的总传热系数提高两倍。然而，随着热通量的增加，由于水-CNT和水-CNT表面活性剂纳米流体的剧烈气泡生成，增强作用被掩盖了。在研究过程中，在水-CNT表面活性剂纳米流体的无液表面上也观察到了起泡。实验后未观察到在测试切片表面上的结垢。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第6期|p.1289-1296|共8页
  • 作者

    R. Kathiravan; Ravi Kumar; Akhilesh Gupta; Ramesh Chandra; P.K. Jain;

  • 作者单位

    Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247 667, India;

    Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247 667, India;

    Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247 667, India;

    Institute Instrumentation Centre, Indian Institute of Technology, Roorkee 247 667, India;

    Centre for Carbon Materials, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500005, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanofluids; carbon nanotubes; heat transfer coefficient; pool boiling;

    机译：纳米流体碳纳米管;传热系数池沸腾;

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