Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2020-09-16 , DOI: 10.1080/01457632.2020.1818427 Jin Wang 1 , Zhengjia Zhai 1 , Dan Zheng 1 , Li Yang 1 , Bengt Sundén 2
Abstract
Commonly, heat transfer performance of a nanofluid is enhanced by increasing the mass fraction of nanoparticles due to an improvement of the thermo-physical properties. However, increasing the number of nanoparticles in the base fluid will result in an increase of the nanofluid viscosity. This research aims to investigate natural convective heat transfer for an electric heater filled with various Al2O3-water nanofluids. The effects of various mass fractions of the nanofluid (0.1–2.0 wt.%) on the heating efficiency of the electric heater were analyzed over time, and results indicate that the electric heater with the 1.0% Al2O3-water nanofluid has the highest heating efficiency of the external environment.
中文翻译:
Al2O3-水纳米流体在电加热器中的传热特性研究
摘要
通常,由于热物理性质的改善,纳米流体的传热性能通过增加纳米颗粒的质量分数来增强。然而,增加基液中纳米粒子的数量将导致纳米流体粘度的增加。本研究旨在研究填充各种 Al 2 O 3 -水纳米流体的电加热器的自然对流传热。随着时间的推移,分析了不同质量分数的纳米流体(0.1-2.0 wt.%)对电加热器加热效率的影响,结果表明含有 1.0% Al 2 O 3 -water 纳米流体的电加热器具有外部环境的最高加热效率。