Effect of non-uniform heating on conjugate heat transfer performance for nanofluid flow in a converging duct by a two-phase Eulerian–Lagrangian method

Abstract

In this paper, the effect of non-uniform heating on the conjugate thermal and hydraulic characteristics for Al2O3–water nanofluid flow through a converging duct is examined numerically. An Eulerian–Lagrangian model is employed to simulate the two-phase flow for the following range of parameters: Reynolds number (100 ≤ Re ≤ 800), nanoparticle volume fraction (0% ≤ ϕ ≤ 5%) and amplitude of the sinusoidal heat flux ( A = 0, 0.5 and 1). The results reveal a similar affinity between the applied heat flux and local Nusselt number variation qualitatively, mainly at the middle of the duct. The results also indicate that there is a considerable enhancement of Nusselt number with the increase in Reynolds number and the thermal conductivity of wall materials. In addition, increasing the particle loading contributes to an enhanced rate of heat transfer. The heat transfer rate is lower for non-uniform heating when compared with the constant heat flux and the same can be compensated by the application of volume fraction of nanoparticles

Analysis of conjugate heat transfer for forced convective flow through wavy minichannel

“…The conjugate heat transfer is governed by the conservation of mass and momentum equations in the fluidic domain and the coupled energy conservation equations in both the fluid and solid domain. By neglecting viscous dissipation and radiation heat transfer effects and assuming constant thermo-physical properties for both the solid and fluid, the governing equations are (Borah and Pati, 2021a, 2021b; Faizan et al , 2022):…”

“…Such proposition may hold true when the conductive resistance in the solid wall is negligibly small either due to higher thermal conductivity of the solid substrate or because of negligible thickness of the wall. Nonetheless, in several applications involving internal forced convective flow, the effect of conduction heat transfer in the solid walls may be extremely decisive in dictating the thermal transport characteristics (Borah and Pati, 2021a, 2021b; Faizan et al , 2021). Accordingly, one should analyze the transport phenomena in the fluidic domain and the conductive heat transfer in the solid substrate simultaneously, which is termed as conjugate heat transfer.…”

Impact of non-uniform heat flux conditions on convective heat transfer and energy efficiency in a corrugated tube

“…Moreover, Bhowmick and Randive [ 33 ] determined that the optimal parameters for maximizing heat transfer and minimizing entropy in a porous wavy channel with non-uniform wall heat flux were 5 mm wavelength and 180° phase angle. Apart from the discussed literature, Faizan et al [ 34 , 35 ] and Rajesh et al [ 36 ] also investigated the impact of NUHF in controlling the heat transfer rate in thermal equipment. These studies demonstrated significant advantages in controlling the heat transfer rate by employing NUHF conditions.…”

Hydrothermal study of nanofluid flow in channel by RBF method with exponential boundary conditions

“…They demonstrated that the temperature field increased in both converge and diverge walls, and the velocity parameter was stronger in diverging channels than in the converging ones. Faizan et al, 27 in another investigation, analyzed the nanofluid flow inside a converging channel. They discovered that the Nusselt number increases by raising the thermal conductivity of the wall and Reynolds number.…”