Unsteady Electrohydrodynamic Stagnation Point Flow of Hybrid Nanofluid Past a Convective Heated Stretch/Shrink Sheet

Muhammad Jawad,Rashid Jan,Ibni Amin,Salah Boulaaras,Sahar Ahmed Idris,Niaz Ali Shah,David Carf

doi:10.1155/2021/6229706

Abstract

Unsteady electrohydrodynamic hybrid nanofluid Al 2 O 3 ‐ Cu / H 2 O past a convective heat stretched/shrinked sheet is examined. A stagnation point fluid flow with velocity slip constrains and heat source or sink is deliberated. The combined set of PDEs is translated into ODEs by including approved similarity transformations. HAM is applied for the solution to the obtained nonlinear system. The magnetic input factor, Prandtl number, electric field factor, Eckert number, heat source factor, and unstable factor are the governing parameters. The impact of these factors on the temperature and velocity profiles features of the problem is considered with explanation. Intensification in values of electric and magnetic fields parameters enhanced the heat transfer rate. The greater Prandtl number lessens the temperature. Amplification in temperature is perceived for Eckert parameter. The heat transferred rate of hybrid nanofluid in the entire domain increases as the heat source increases, while the heat sink has the opposite effect. Skin friction and Nusselt number is increased for increasing values of magnetic field parameters. It is also noted that Nusselt number lessens for raising in Pr , E , and Ec . Furthermore, it is eminent that the hybrid nanofluid possesses better result compared to the nanofluid.

Highlights

The ability of nanofluids to improve heat transfer performance in a range of industrial applications due to the substantial raise in thermal conductivity of the resulting fluid has piqued interest in recent years
Many researchers have been interested in studying heat source in a hybrid nanofluid in recent years because of its ability to boost heat transfer rates when compared to ordinary nanofluid
Most heat transferring uses, such as transformer cooling, electronic cooling, and coolant in machines, have used hybrid nanofluid as the heat source fluid

Summary

Introduction

The ability of nanofluids to improve heat transfer performance in a range of industrial applications due to the substantial raise in thermal conductivity of the resulting fluid has piqued interest in recent years. The authors in [4] conceptualize and investigate the flow of hybrid nanofluid over an unsteady stagnation point convective heat stretch/shrink surface including the velocity slip impact on heat transfer. Many academics have studied numerous influences on flow behavior by extending the stagnationpoint flow problem This problem is further investigated by Bachok et al [27] without and with heat transferred where the authors discovered the decreasing case’s solutions are no unique and that increasing the melting parameter reduces the heat source rate at the solid-fluid interface. As a result of the aforementioned issues, the researchers decided to interrogate the unstable stagnation-point flow towards a convective heated stretched or shrinked surface in alumina–copper/water ðAl2O3‐Cu/H2OÞ to see how velocity slip affects heat transfer. By applying the homotopy method, an analytical solution has been computed

Mathematical Formulation

Solution by HAM

Results and Discussion

Concluding Remarks

H1: Velocity slip factor ρs