Entropy generation optimisation in the nanofluid flow of a second grade fluid with nonlinear thermal radiation

Purpose The purpose of this study is to scrutinize the effects of entropy generation and nonlinear mixed convection on the boundary layer flow of second grade fluid induced by stretching sheets. Heat transfer effects are accounted in view of viscous dissipation and nonlinear thermal radiation. Design/methodology/approach Optimal homotopic asymptotic method procedure is adopted to obtain the analytical solution of nonlinear ordinary differential equations. Findings It has been noticed that Hartmann and Brinkman number has reverse characteristics against entropy generation and Bejan number. Originality/value To the best of the authors’ knowledge, no such analysis has been reported to date.

Download Full-text

Entropy generation in a second grade magnetohydrodynamic nanofluid flow over a convectively heated stretching sheet with nonlinear thermal radiation and viscous dissipation

Results in Physics ◽

10.1016/j.rinp.2018.04.003 ◽

2018 ◽

Vol 9 ◽

pp. 1077-1085 ◽

Cited By ~ 34

Author(s):

Hloniphile Sithole ◽

Hiranmoy Mondal ◽

Precious Sibanda

Keyword(s):

Thermal Radiation ◽

Viscous Dissipation ◽

Entropy Generation ◽

Stretching Sheet ◽

Second Grade ◽

Nonlinear Thermal Radiation ◽

Nanofluid Flow

Download Full-text

Entropy Generation in MHD Second-Grade Nanofluid Thin Film Flow Containing CNTs with Cattaneo-Christov Heat Flux Model Past an Unsteady Stretching Sheet

Applied Sciences ◽

10.3390/app10082720 ◽

2020 ◽

Vol 10 (8) ◽

pp. 2720 ◽

Cited By ~ 1

Author(s):

Zahir Shah ◽

Ebraheem O. Alzahrani ◽

Abdullah Dawar ◽

Wajdi Alghamdi ◽

Malik Zaka Ullah

Keyword(s):

Entropy Generation ◽

Volume Fraction ◽

Second Grade ◽

Thin Film Flow ◽

Second Grade Fluid ◽

Fluid Parameter ◽

Grade Fluid ◽

Flux Model ◽

Walled Carbon Nanotubes ◽

Heat Flux Model

Entropy generation plays a significant role in several complex processes, extending from cosmology to biology. The entropy generation minimization procedure can be applied for the optimization of mechanical systems including heat exchangers, elements of nuclear and thermal power plants, ventilation and air-conditioning systems. In order to present our analysis, entropy generation in a thin film flow of second grade nanofluid holding single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) with a Cattaneo–Christov heat flux model is studied in this article. The flow is considered passing a linearly extending surface. A variable magnetic field with aligned angle ε is functioned along the extending sheet. With the aid of the homotopy analysis method (HAM), the fluid flow model is elucidated. The impressions of embedded factors on the flow are obtainable through figures and discussed in detail. It is observed that the velocity profile escalated with the increasing values of volume fraction of nanoparticles and second grade fluid parameter. The higher values of volume fraction of nanoparticles, second grade fluid parameter, non-linear heat source/sink, and thermal radiation parameter intensified the temperature profile. Surface drag force escalated with heightening values of nanoparticles volume fraction, unsteadiness, film thickness, magnetic, and second grade fluid parameters. Entropy generation increased with enhancing values of magnetic parameter, Brinkman number, and Reynolds number.

Download Full-text

A theoretical investigation for mixed convection impact in non-Newtonian nanofluid stratified flow subjected to magnetic field

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-12-2018-0769 ◽

2019 ◽

Vol 29 (8) ◽

pp. 2948-2963 ◽

Cited By ~ 4

Author(s):

Muhammad Waqas ◽

Muhammad Mudassar Gulzar ◽

Zeeshan Asghar ◽

Z. Ali ◽

Waqar Azeem Khan ◽

...

Keyword(s):

Magnetic Field ◽

Mixed Convection ◽

Thermal Stratification ◽

Design Methodology ◽

Thermal Field ◽

Second Grade ◽

Second Grade Fluid ◽

Nanofluid Flow ◽

Content Type ◽

Grade Fluid

Purpose The purpose of this study is to elaborate mixed convection impact in stratified nanofluid flow by convectively heated moving surface. Rheological relations of second-grade fluid are used for formulation. Magnetic field, heat absorption/generation and convective conditions are considered for modeling. Design/methodology/approach Convergent solutions are achieved using homotopy procedure. Findings The authors found opposing behavior for radiation and thermal stratification variables against thermal field. Originality/value No such analysis has yet been reported.

Download Full-text