Heat Transfer and Flow of Nanofluids in a Y-Type Intersection Channel with Multiple Pulsations: A Numerical Study

Abstract

Abstract:In this paper, we study pulsed flow and heat transfer in water-Al 2 O 3 nanofluids in a Y-type intersection channel with two inlets and one outlet. At the two inlets, two sinusoidal velocities with a phase difference of π are applied. We assume that the shear viscosity and the thermal conductivity of the nanofluids depend on the nanoparticles concentration. The motion of the nanoparticles is modeled by a convention-diffusion equation, where the effects of the Brownian motion, thermophoretic diffusion, etc., are included. The effects of pulse frequency, pulse amplitude and nanoparticles concentration on the heat transfer are explored numerically at various Reynolds numbers. The results show that the application of the pulsed flow improves the heat transfer efficiency (Nusselt number) for most of the cases studied. Amongst the four factors considered, the effect of the frequency seems to be the most important.

Heat Transfer in a Drilling Fluid with Geothermal Applications

“…In current work, the non-homogenous single phase model will be used; this approach retains several important features of the two-fluid (two-phase) approach, with lower computational cost [36]. If the effects of electro-magnetism and chemical reactions are ignored, the governing equations, for a single component suspension, are the conservation equations for mass, linear and angular momentum, particle concentration, and energy [11,33,36,37].…”

“…/∂t + [grad(.)]v. The conservation of angular momentum indicates that in the absence of couple stresses the stress tensor is symmetric, that is, T = T T [36].…”

“…where µ m is the viscosity of the suspension, I is the identity tensor, D is the symmetric part of the velocity gradient, and p is the pressure [36]. In general, the shear viscosity can depend on,…”

“…where k is the thermal conductivity of the material [36]. For complex materials, k can depend on various parameters/fields, such as concentration, temperature, shear rate, etc.…”

Influence of the Periodicity of Sinusoidal Boundary Condition on the Unsteady Mixed Convection within a Square Enclosure Using an Ag–Water Nanofluid

“…They demonstrated that there is an ideal incentive for nanofluid volume fraction to control heat exchange, temperature appropriation, and stream field. Wu et al [46] studied the heat transfer and pulsed flow in a Y-type crossing point channel with two inlets and one outlet utilizing water-Al 2 O 3 nanofluids. They demonstrated that the utilization of the pulsed flow enhances the Nusselt number, particularly for a huge Reynolds number and a high pulse frequency.…”