3D Magneto-Buoyancy-Thermocapillary Convection of CNT-Water Nanofluid in the Presence of a Magnetic Field

Abstract

A numerical study is performed to investigate the effects of adding Carbon Nano Tube (CNT) and applying a magnetic field in two directions (vertical and horizontal) on the 3D-thermo-capillary natural convection. The cavity is differentially heated with a free upper surface. Governing equations are solved using the finite volume method. Results are presented in term of flow structure, temperature field and rate of heat transfer. In fact, results revealed that the flow structure and heat transfer rate are considerably affected by the magnitude and the direction of the magnetic field, the presence of thermocapillary forces and by increasing nanoparticles volume fraction. In opposition, the increase of the magnetic field magnitude leads to the control the flow causing flow stabilization by merging vortexes and reducing heat transfer rate.

Photothermocapillary Method for the Nondestructive Testing of Solid Materials and Thin Coatings

“…Another report states that the PTC effect is a thermocapillary (TC) flow, since fluid flow can take place at a very low velocity in the absence of deformation [ 1 ]. In general, a temperature change, , on the surface of a liquid can be induced using various heat sources, including focused electromagnetic radiation of any wavelength (ultraviolet, visible, or infrared) [ 12 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. In two limiting cases, PTC flow takes place in a liquid, which strongly absorbs the electromagnetic radiation at its surface, and/or in a liquid, which is either transparent or weakly absorbs the radiation of a pumped laser or a halogen lamp [ 13 ].…”

Third-grade non-Newtonian fluid flow and heat transfer in two coaxial pipes with a variable radius ratio with magnetic field

“…In the recent decade, the interest to analysis of the non-Newtonian fluid is increased, due to their relation to applied sciences. The governing equations in these kinds of fluids flow are complicated and of higher-order in comparison with the governing equations of Newtonian fluids flow (Kolsi et al, 2020;Al-Rashed et al, 2019;Selimefendigil and Öztop, 2018;Al-Rashed et al, 2017;Selimefendigil and Öztop, 2016;Maatki et al, 2016;Hussein et al, 2016;Bondareva et al, 2016;Selimefendigil and Öztop, 2014). Besides, the subject of magnetohydrodynamics (MHD) and using analytical and numerical methods for analyzing has been considered by many researchers (Taheri, 2019;Selimefendigil et al, 2019aSelimefendigil et al, , 2019bJavanmard et al, 2019;Asiful et al, 2019;Aly and Pop, 2019;Taheri et al, 2017).…”