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首页> 外文期刊>Journal of enhanced heat transfer >EXPERIMENTAL INVESTIGATIONS ON THE COMBINED EFFECT OF NANOFLUID AND ULTRASONIC FIELD ON AMMONIA BUBBLE ABSORPTION
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EXPERIMENTAL INVESTIGATIONS ON THE COMBINED EFFECT OF NANOFLUID AND ULTRASONIC FIELD ON AMMONIA BUBBLE ABSORPTION

机译：纳米流体和超声波场在氨泡吸收上的综合作用的实验研究

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摘要

This article investigates the enhancement effect of nanofluid and ultrasonic fields separately and simultaneously on ammonia bubble absorption in the absorber for improving the efficiency of the absorption refrigeration system. Ammonia bubble absorption experiments are carried out in a visualized absorber. Three nanofluids (Al2O3, Fe2O3, and multiwalled carbon nanotubes LMWNTs]) at different concentrations and ultrasonic fields of single frequency (20 kHz, 28 kHz, and 40 kHz) and mixed frequency (20-28 kHz, 20-40 kHz, 28-40 kHz, and 20-28-40 kHz) are studied as enhancement factors. The absorption amount of ammonia and the effective absorption ratio, with and without enhancement factors, are obtained during the experiments. The bubble behaviors during the absorption process are observed: occurs, grows, detaches, diffuses, transforms, and vanishes. The results show that the addition of nanofluids enhances the heat and mass transfer process in the absorber. This enhancement ability follows Fe2O3 Al2O3 MWNTs. The effective absorption ratio achieves 1.16 enhanced by Fe2O3 nanofluid of 0.020 wt%. For the ultrasonic field of single frequency, the higher the frequency, the higher the effective absorption ratio. The mixed ultrasonic field results in better effects than the single ultrasonic field. Under the mixed ultrasonic field of 20-28-40 kHz, the effective absorption ratio reaches 1.11. Finally, the effect of combined actions of nanofluid and ultrasonic field are tested. The effective absorption ratio is 1.22 with the ultrasonic field of 20-28-40 kHz and nanofluid of 0.020 wt% Fe2O3.
机译：本文研究了纳米流体和超声波场的增强效果，同时对吸收器中的氨泡吸收，以提高吸收制冷系统的效率。氨气吸收实验在可视化吸收器中进行。三种纳米流体（Al2O3，Fe2O3和多壁碳纳米管Lmwnts]）不同浓度和单频的超声波场（20kHz，28 kHz和40kHz）和混合频率（20-28kHz，20-40kHz，28- 40 kHz和20-28-40 kHz）被研究为增强因子。在实验期间，获得氨的吸收量和有效吸收比，有效吸收率，无增强因子。观察到吸收过程中的气泡行为：发生，生长，分离，扩散，转化和消失。结果表明，添加纳米流体增强了吸收器中的热量和传质过程。这种增强能力遵循Fe2O3> Al2O3> MWNT。有效吸收率达到1.16的Fe2O3纳米流体增强0.020重量％。对于单频的超声波场，频率越高，有效吸收率越高。混合超声波场导致比单个超声场更好的效果。在20-28-40 kHz的混合超声波场下，有效吸收率达到1.11。最后，测试了纳米流体和超声场的组合作用的影响。有效吸收率为1.22，超声波电场为20-28-40 kHz，纳米流体为0.020wt％Fe2O3。

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  • 来源
    《Journal of enhanced heat transfer》 |2020年第2期|159-171|共13页
  • 作者

    Yang Yingying; Wu Weidong; Tang Hengbo; Lu Jian;

  • 作者单位

    Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China|Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China;

    Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China|Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China;

    Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China|Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China;

    Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China|Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China;

  • 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

    heat transfer enhancement; ammonia bubble absorption; ultrasonic field; nanofluid; bubble behaviors;

    机译：传热增强;氨气吸收;超声波场;纳米流体;泡沫行为;

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