Thermal Performance of Ionanocolloids in a Cubical Cavity with Internal Protrusions

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Hariharan Ashok, Harish Rajan
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Abstract

Ionic liquids have gained considerable attention as heat transfer fluids due to their unique properties, such as low vapor pressure and high thermal stability, which make them suitable for high-temperature applications. The purpose of this study is to examine the thermal behavior of ionanocolloids in a cubical cavity with an internal protruding heat source. The effect of Brownian motion and turbulence on the flow characteristics and thermal enhancement of ionic liquid dispersed with nanoparticles of silicon dioxide, aluminum oxide, and single-walled carbon nanotubes is investigated. The computations are performed by developing an unsteady, turbulent multiphase mixture model discretized by the finite difference method. The heater aspect ratio (ξ), Grashof number (Gr), and nanoparticle volume concentration (ϕ) are varied in the following range: 0.2 ≤ ξ ≤ 5, 106 ≤ Gr ≤ 1010 and 2% ≤ ϕ ≤ 6%. It is found that the velocity, kinetic energy, and Nusselt number are increasing functions of the heater aspect ratio and particle concentration. The coalescence of the nanoenhanced ionic liquid mixture is phenomenal for its lower heater aspect ratio. The carbon nanotube-dispersed ionanofluid mixture exhibited superior thermal performance for a turbulent Grashof number and enhanced the average Nusselt number of pure ionic liquid by 141.13%. The multiphase model is validated, and results are closer to the benchmark experimental findings.
具有内凸的立方体腔中离子胶体的热性能
离子液体由于其独特的性质,如低蒸汽压和高热稳定性,使其适合高温应用,因此作为传热流体获得了相当大的关注。本研究的目的是研究具有内部突出热源的立方体腔中的离子胶体的热行为。研究了布朗运动和湍流对二氧化硅、氧化铝和单壁碳纳米管纳米颗粒分散离子液体流动特性和热增强的影响。计算是通过建立一个非定常、湍流的多相混合模型,用有限差分法进行离散。加热器宽高比(ξ)、Grashof数(Gr)和纳米颗粒体积浓度(ϕ)的变化范围为:0.2≤ξ≤5,106≤Gr≤1010,2%≤ϕ≤6%。发现速度、动能和努塞尔数是加热器长径比和颗粒浓度的递增函数。纳米增强离子液体混合物的聚并现象是由于其较低的加热器长径比。碳纳米管分散的离子流体混合物在湍流格拉什夫数下表现出优异的热性能,使纯离子液体的平均努塞尔数提高了141.13%。对多相模型进行了验证,结果与基准实验结果更接近。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Enhanced Heat Transfer
Journal of Enhanced Heat Transfer 工程技术-工程:机械
CiteScore
3.60
自引率
8.70%
发文量
51
审稿时长
12 months
期刊介绍: The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.
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