Prakash, J, Tripathi, D, Beg, OA 
ORCID: https://orcid.org/0000-0001-5925-6711, Tiwari, AK and Kumar, R
2022,
'Thermo-electrokinetic rotating non-Newtonian hybrid nanofluid flow from an accelerating vertical surface'
, Heat Transfer, 51 (2)
, pp. 1746-1777.
Access Information: This is the peer reviewed version of the following article: jayavel, P, Tripathi, D, Anwar Bég, O, Tiwari, AK, Kumar, R. Thermo-electrokinetic rotating non-Newtonian hybrid nanofluid flow from an accelerating vertical surface. Heat Transfer. 2021, which has been published in final form at https://doi.org/10.1002/htj.22373. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Abstract
This paper explores the combined effects of Coriolis force and electric force on the rotating
boundary layer flow and heat transfer in a viscoplastic hybrid nanofluid from a vertical
exponentially accelerated plate. The hybrid nanofluid comprises two different types of metallic
nanoparticles, namely silver (Ag) and magnesium oxide (MgO) suspended in an aqueous base
fluid. The Casson model is deployed for non-Newtonian effects. An empirical model is
implemented to determine the thermal conductivity of the hybrid nanofluid. Rosseland’s radiative
diffusion flux model is also utilized. Axial electrical field is considered and the Poisson-Boltzmann
equation is linearized via the Debye-Hückel approach. The resulting coupled differential equations
subject to prescribed boundary conditions are solved with Laplace transforms. Numerical
evaluation of solutions is achieved via MATLAB symbolic software. A parametric study of the
impact of key parameters on axial velocity, transverse velocity, nanoparticle temperature and
Nusselt number is conducted for both hybrid (Ag-MgO)-water nanofluid and also unitary (Ag)-water nanofluid. With increasing volume fraction of silver nanoparticles there is a reduction in
both axial velocity and temperatures whereas there is a distinct elevation in transverse velocity for
both unitary and hybrid nanofluid. Elevation in heat absorption parameter strongly decreases axial
velocity whereas it enhances transverse velocity. Increasing radiation parameter strongly boosts
temperatures. Increasing heat absorption parameter significantly accelerates the transverse flow.
Negative values of Helmholtz-Smoluchowski velocity decelerate the axial flow whereas positive
values accelerate it; the opposite behavior is observed for transverse velocity. Increasing Taylor
number significantly damps both the axial (primary) and transversal (secondary) flow. Increasing
thermal Grashof number strongly enhances the axial flow but damps the transverse flow. Unitary
nanofluid achieves higher Nusselt numbers than hybrid nanofluid but these are decreased with
greater radiative effect (since greater heat transport away from the plate surface), Prandtl number
and heat absorption. Nusselt number is significantly reduced with greater time progression and
values are consistently higher for unitary nanofluid compared with hybrid nanofluid. The
computations provide insight into more complex electrokinetic rheological nanoscale flows of
relevance to biomedical rotary electro-osmotic separation devices.
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