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首页> 外文期刊>Journal of Heat Transfer >Critical Invalidation of Temperature Dependence of Nanofluid Thermal Conductivity Enhancement
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Critical Invalidation of Temperature Dependence of Nanofluid Thermal Conductivity Enhancement

机译:纳米流体导热系数增强的温度依赖性的临界失效

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摘要

Of interest is the accurate measurement of the enhanced thermal conductivity of certain nanofluids free from the impact of natural convection. Owing to its simplicity, wide range of applicability and short response time, the transient hot-wire method (THWM) is frequently used to measure the thermal conductivity of fluids. In order to gain a sufficiently high accuracy, special care should be taken to assure that each measurement is not affected by initial heat supply delay, natural convection, and signal noise. In this study, it was found that there is a temperature limit when using THWM due to the incipience of natural convection. The results imply that the temperature-dependence of the thermal conductivity enhancement observed by other researchers might be misleading when ignoring the impact of natural convection; hence, it could not be used as supporting evidence of the effectiveness of micromixing due to Brownian motion. Thus, it is recommended that researchers report how they keep the impact of the natural convection negligible and check the integrity of their measurements in the future researches.
机译:令人感兴趣的是不受自然对流影响的某些纳米流体增强的热导率的准确测量。由于其简单,适用范围广,响应时间短等优点,瞬态热线法(THWM)经常用于测量流体的热导率。为了获得足够高的精度,应格外小心,以确保每次测量都不受初始供热延迟,自然对流和信号噪声的影响。在这项研究中,由于自然对流的开始,发现使用THWM时存在温度限制。结果表明,当忽略自然对流的影响时,其他研究人员观察到的导热系数的温度依赖性可能会产生误导。因此,它不能用作布朗运动引起的微混合效果的支持证据。因此,建议研究人员报告他们如何保持自然对流的影响可忽略不计,并在以后的研究中检查其测量的完整性。

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