Shape effect of nanosize particles in unsteady mixed convection flow of nanofluid over disk with entropy generation

Abstract

The aim of this paper is to study the different shapes of nanoparticles on mixed convective steady flow over a rotating disk. For nanofluid, the copper nanoparticles of disk, cylindrical, and spherical shapes of different sizes and water as base fluid are considered. The physical problem is first modeled and then the governing equations are transformed into nonlinear ordinary differential equations. These equations are dimensionless using geometrical and physical flowfielddependent parameters and solved analytically. A very good agreement is observed between the obtained results of the current study and previously published study in limiting cases. The shape effects on velocity profiles in radial, tangential, axial directions, and temperature distribution are displayed graphically with the reflection of specific range of nanolayer thickness and its conductivity. In addition, irreversibility due to heat and fluid friction is investigated that supports the heat transfer enhancement in renewable energy systems and industrial thermal management. For the analysis of the averaged entropy generation number, the results are shown in pie charts and tablet form. It is evident from the study that proper choice of nanoparticles will be helpful in controlling velocity and heat transfer. It is also observed that irreversibility process can be reduced by using nanoparticles, especially the spherical particles.

Thin Film Williamson Nanofluid Flow with Varying Viscosity and Thermal Conductivity on a Time-Dependent Stretching Sheet

“…The published work is incomplete, though for both of these physical parameter there exist numerous industrial and mechanical applications. The few other investigations in this direction were made by Ellahi et al [37], Akbar et al [38,39], Shehzad et al [40], and Zeeshan et al [41].…”

Entropy Generation on Nanofluid Flow through a Horizontal Riga Plate

“…They found that entropy generation enhances due to the influence of all the physical parameters. Some more pertinent studies on this topic can be found in references [23][24][25]. According to the best of our knowledge, entropy generation on viscous nanofluid flow through a horizontal Riga plate has not been reported before.…”

“…Let us consider the following non-dimensional quantities With the help of Oberbeck-Boussinesq approximation, let us consider that nanoparticle is dilute, and then the boundary layer equations for continuity, linear momentum, thermal energy and concentration equation can be written as [24] …”

The Brownian and Thermophoretic Analysis of the Non-Newtonian Williamson Fluid Flow of Thin Film in a Porous Space over an Unstable Stretching Surface

“…Ellahi et al studied Nanofluid over different phenomena mentioned in [13][14][15][16][17]. A detailed data on thin film Williamson Nanofluid Flow with Varying Viscosity and Thermal Conductivity on a Time-Dependent Stretching Sheet is given by Khan et al [18].…”