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Thermal radiation

About: Thermal radiation is a research topic. Over the lifetime, 12290 publications have been published within this topic receiving 197186 citations. The topic is also known as: heat radiation.


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TL;DR: In this article, a similarity transformation is used to transmute the governing momentum and energy equations into non-linear ordinary differential equations with appropriate boundary conditions, and the obtained nonlinear ODEs are solved numerically.
Abstract: In this study, buoyancy MHD nanofluid flow and heat transfer over a stretching sheet in the presence of Joule heating and thermal radiation impacts, are studied. Cattaneo–Christov heat flux model instead of conventional Fourier’s law of heat conduction is applied to investigate the heat transfer characteristics. A similarity transformation is used to transmute the governing momentum and energy equations into non-linear ordinary differential equations with the appropriate boundary conditions. The obtained non-linear ordinary differential equations are solved numerically. The impacts of diverse active parameters such as the magnetic parameter, the radiation parameter, the buoyancy parameter, the heat source parameter, the volume fraction of nanofluid and the thermal relaxation parameter are examined on the velocity and temperature profiles. In addition, the value of the Nusselt number is calculated and presented through figures. The results demonstrate that the temperature profile is lower in the case of Cattaneo–Christov heat flux model as compared to Fourier’s law. Moreover, the Nusselt number raises with the raising volume fraction of nanofluid and it abates with the ascending the radiation parameter.

57 citations

Journal ArticleDOI
TL;DR: In this paper, the quadratic convective flow of hybrid nanoliquid in an annulus subjected to thermal radiation is studied for the first time, and the impact of suction/injection and the uniform movement of the rings are considered.
Abstract: The quadratic convective flow of hybrid nanoliquid in an annulus subjected to quadratic thermal radiation is studied for the first time. The impact of suction/injection and the uniform movement of the rings are considered. Nonlinear equations are handled numerically by adopting the shooting technique. An optimization procedure is performed by using response surface methodology. The maximum heat transport is observed for chosen values of effective parameters (thermal radiation parameter $$ (5 \le Rt \le 15) $$ , temperature ratio parameter $$ (1.1 \le \theta_{w} \le 5.1) $$ and nanoparticle volume fraction of copper $$ (1\% \le \phi_{\text{Cu}} \le 3\% )) $$ at three different levels (low(− 1), middle(0) and high(+ 1)). In addition, a slope of the data point is evaluated for the friction coefficient and the Nusselt number. The results showed that the impact of quadratic thermal radiation on velocity and temperature distributions is more significant than linear thermal radiation. Further, an increase in quadratic convection and quadratic thermal radiation leads to an improvement in the friction coefficient of the skin on the inner surface of the outer annulus. Furthermore, the sensitivity of the friction coefficient is positive for the appearance of quadratic thermal radiation.

57 citations

Journal ArticleDOI
TL;DR: In this article , the authors investigated the steady stream and energy transfer of hybridizing nanoparticles across a surface with radiative impacts, and used the Galerkin finite element technique to solve the issue analytically.

57 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive heat transfer model including both conduction and radiation under contact and non-contact conditions was proposed to numerically investigate the heat exchange among particles at five different pathways by employing the discrete element method.

57 citations

Journal ArticleDOI
TL;DR: In this article, the authors developed explicit and compact formulas for electromagnetic heat transfer in systems consisting of a large number of bodies without the constraint of reciprocity and demonstrated the emergence of a persistent heat current at thermal equilibrium and a directional heat flow at nonequilibrium in systems composed of multiple magneto-optical particles.
Abstract: Understanding electromagnetic heat transfer in many-body systems is critical to exploring new physics effects that can arise in reciprocal and nonreciprocal many-body systems. Here, the authors develop explicit and compact formulas for electromagnetic heat transfer in systems consisting of a large number of bodies without the constraint of reciprocity. They go on to demonstrate the emergence of a persistent heat current at thermal equilibrium and a directional heat flow at nonequilibrium in systems composed of multiple magneto-optical particles. This opens up possibilities for controlling near-field electromagnetic heat transfer using complex reciprocal and nonreciprocal systems.

57 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023375
2022749
2021575
2020636
2019663
2018618