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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow
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Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

机译：湍流管中能量应用中代表性熔盐传热和流动特性的数值和实验研究

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摘要

This article investigated the heat transfer performance and flow friction of molten salts in turbulent tube flow, where four salts including Hitec, Solar Salt, NaF-NaBF4, and FLiNaK were studied. A computational model was developed to analyze the flow and heat transfer features of the salts in the tube, and experiments were conducted to test the heat transfer performance of a representative salt Hitec in the tubes of a salt-oil heat exchanger. Comparison of simulation results with the experimental data shows that the average errors are smaller than +/- 4%, which validates the simulation model. Based on the model, firstly the influences of heat flux uniformity at the tube outer wall were examined. The results show that the non-uniform wall flux can lead to local high-temperature region but influences little on the flow friction coefficient and the heat transfer performance. Then, the model was utilized to investigate the friction and heat transfer features of the salts under broad ranges of the temperature and the velocity. Comparisons of the simulated heat transfer results with Hansen's, Sider-Tate's and Gnielinski's correlations show that the largest errors can reach +25%, +13% and -15%, respectively. Furthermore, the errors between the simulated friction coefficients and the Filonenko's correlation are smaller than +/- 2%, which indicates that this correlation is suitable for predicting the friction of the salts. Finally, to predict the heat transfer performance more accurately for these representative salts, a new correlation was developed. It was found that the errors between all simulation results and the proposed correlation are smaller than +/- 5%, while the corresponding values for 80% experiment data of three salts are also lower than +/- 5%. The current study can offer beneficial results and correlation for the applications of molten salts in energy systems. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文研究了湍流管中熔融盐的传热性能和流动摩擦，研究了Hitec，太阳盐，NaF-NaBF4和FLiNaK四种盐。建立了计算模型以分析管中盐的流动和传热特性，并进行了实验以测试代表性的盐Hitec在盐油热交换器管中的传热性能。仿真结果与实验数据的比较表明，平均误差小于+/- 4％，从而验证了仿真模型。基于该模型，首先研究了热流均匀性在管子外壁的影响。结果表明，不均匀的壁通量可以导致局部高温区域，但对流动摩擦系数和传热性能的影响很小。然后，利用该模型研究盐在较大的温度和速度范围内的摩擦和传热特性。模拟的传热结果与Hansen，Sider-Tate和Gnielinski的相关性进行比较，结果表明最大的误差分别可以达到+25％，+ 13％和-15％。此外，模拟的摩擦系数与Filonenko的相关性之间的误差小于+/- 2％，这表明该相关性适合于预测盐的摩擦。最后，为了更准确地预测这些代表性盐的传热性能，开发了一种新的相关性。发现所有模拟结果和拟议的相关性之间的误差均小于+/- 5％，而三种盐的80％实验数据的相应值也低于+/- 5％。当前的研究可以为熔融盐在能源系统中的应用提供有益的结果和相关性。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 作者

    Qiu Yu; Li Ming-Jia; Li Meng-Jie; Zhang Hong-Hu; Ning Bo;

  • 作者单位

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, 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

    Molten salts; Heat transfer performance; Friction factor; Concentrating solar power; Nuclear energy;

    机译：熔融盐;传热性能;摩擦系数;聚光太阳能;核能;

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