Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2021-09-15 , DOI: 10.1016/j.csite.2021.101449 Azad Hussain 1 , Qusain Haider 1 , Aysha Rehman 1 , Hijaz Ahmad 2, 3 , Jamel Baili 4, 5 , Noufe H. Aljahdaly 6 , Ali Hassan 1
The enhancement of thermal heat transfer utilizing the hybrid nanofluids is explored widely by numerous researchers over the years. Because of these exciting characteristics features of hybrid nanofluids, the prime focus of this article is the investigation of engine oil and mineral oil-based hybrid nanofluids consisting of carbon nanotubes (SWCNT-MWCNT) over a rotating cone present in a convectively heated permeable environment. In the flow supposition, a mathematical model is formulated, Boundary layer approximations are used to minimize the structure of partial differential equations. The dimensionless system of highly non-linear partial differential equations is obtained through boundary layer approximation. The findings obtained showed a rise in temperature for both CNT's, the thickness of the thermal boundary layer has increased under the impact of solid volume fraction of nanotubes. SWCNTs provide a reduction in skin friction and enhancement in Nusselt number. The hybrid nanofluid with EO (engine oil) base has demonstrated a greater heat transfer coefficient and reduced fluid motion's skin friction than MO (mineral oil) based. The model hybrid flow can be used in industries like turbine heat production, wind energy generation, and pharmaceutical processes.
中文翻译:
由旋转体引起的单壁和多壁碳纳米管流动的混合传热和传质研究的热导率模型
多年来,许多研究人员广泛探索了利用混合纳米流体增强热传递。由于混合纳米流体的这些令人兴奋的特性,本文的主要重点是研究发动机油和基于矿物油的混合纳米流体,该混合纳米流体由碳纳米管 (SWCNT-MWCNT) 组成,位于存在于对流加热可渗透环境中的旋转锥体上。在流动假设中,建立了一个数学模型,使用边界层近似来最小化偏微分方程的结构。通过边界层近似得到高度非线性偏微分方程的无量纲系统。获得的发现表明两个 CNT 的温度升高,在纳米管固体体积分数的影响下,热边界层的厚度有所增加。SWCNT 可减少皮肤摩擦并提高努塞尔数。与基于 MO(矿物油)的混合纳米流体与基于 EO(发动机油)的混合纳米流体表现出更大的传热系数和减少的流体运动的皮肤摩擦。模型混合流可用于涡轮机热生产、风力发电和制药过程等行业。