Numerical investigation of thermal pulsating alumina/water nanofluid flow over three different cross-sectional channel

Abstract

Purpose The purpose of this study is to investigate the pulsating flow in a three-dimensional channel. Channel flow is laminar and turbulent. After validation, the effect of different channel cross-sectional geometries (circular, hexagonal and triangular) with the pulsating flow are investigated. For this purpose, the alumina nanofluid was considered as a working fluid with different volume percentages (0 per cent [pure water], 3 per cent and 5 per cent). Design/methodology/approach In this study, the pulsatile flow was investigated in a three-dimensional channel. Channel flow is laminar and turbulent. Findings The results show that the fluid temperature decreases by increasing the volume percentage of particles of Al2O3; this is because of the fact that the input energy through the wall boundary is a constant value and indicates that with increasing the volume percentage, the fluid can save more energy at a constant temperature. And by adding Al2O3 nanofluid, thermal performance improves in channels, but it should be considered that the use of nanofluid causes a pressure drop in the channel. Originality/value Alumina/water nanofluid with the pulsating flow was investigated and compared in three different cross-sectional channel geometries (circular, hexagonal and triangular). The effect of different volume percentages (0 per cent [pure water], 3 per cent and 5 per cent) of Al2O3 nanofluid on temperature, velocity and pressure are studied.

The influences of electric field intensity and driving force on the slip behaviour of water flow in a nanochannel

“…We first give examples of static structure factors with the same electric field strength under different driving forces ( Fig 5 ). Under the action of a strong electric field E = 0.06 and a strong driving force F = 0.0005, the static structure factor S ( G 1 )/ S (0) in the plane oscillates, is attenuated, and a peak appears at the lattice vector [ 31 ]. This sharp peak shows that the water has a certain degree of order, but the water molecules have not yet crystallised.…”

Introduction of explicit equations for the estimation of surface tension, specific weight, and kinematic viscosity of water as a function of temperature

“…The numerical outputs indicated that the derived formulation given in Equation 6exhibited better prediction performance compared to the comparative equation-4 (CE-4) and the comparative equation-5 (CE-5). Finally, from the numerical point of view, it is also noted that some useful recent investigations can be found in the field of thermal energy storage, 19 nanofluid flow, 20,21 low-fluid pressure safety valve design, 22 heat transfer, 23 and thermal analysis. 24…”

New Approaches for Protecting the Computer and Electronic Devices Against Heat Dissipation

“…The scientists explored the heat-pulsed alumina/H2O nanofluid field in a 3D duct, and their findings revealed that increasing the size percentage of Al2O3 particle lowers the fluid temperature, however, using the nanofluid produces a pressure reduction in the channel [13,14]. Valuable studies received by Jajja et al [15] and Manova et al [16] in different situations as shown in Figure 1.…”