Energy transference in time‐dependent Cattaneo–Christov double diffusion of second‐grade fluid with variable thermal conductivity. Issue 8 (3rd August 2021)

• Record Type: Journal Article
• Authors: Haider, Ali; Ayub, Assad; Madassar, Naeem; Ali, Rao K.; Sabir, Zulqurnain; Shah, Syed Z. H.; Kazmi, Syed H.
• Is Part Of: Heat transfer. Volume 50:Issue 8(2021)
• Page Start: 8224
• Page End: 8242
• Publication Date: 2021-08-03
• Subjects: Bvp4c -- Cattaneo–Christov second grade fluid -- heat transport -- variable diffusivity -- variable thermal conductivity; Heat -- Transmission -- Periodicals; Heat -- Transmission; Periodicals; 621.4022
• DOI: 10.1002/htj.22274
• Languages: English
• ISSNs: 2688-4534

Abstract

Abstract: The current investigation communicates the characteristics of upper‐convected second grade nanofluid thin film flow over a time‐dependent stretching sheet with variable thermal conductivity and Cattaneo–Christov double diffusion theory. The mathematical model generates a system of nonlinear partial differential equations (PDEs) for heat, momentum, and mass transfer phenomena. Similarity variables converted the PDEs into nonlinear ordinary differential equations (ODEs). Furthermore, received ODEs are numerically rescued with the built‐in program Bvp4c in MATLAB. The impact of physical parameters like second‐grade fluid λ, unsteadiness parameter S, Prandtl number Pr, Schmidt number Sc, variable thermal conductivity ε, variable diffusivity ε 1, the square of dimensionless film thickness γ, relaxation time δ e, and retardation time δ c are scrutinized. Tables revealed numerical exposure and graphs depict the geometrical aspect of the current study. The velocity field is improved by heightening the λ, magnification in temperature is found for greater conductivity parameter ε . Greater δ e in the temperature profile goes smaller. The rate of mass transfer diminishes by uplifting the estimations in relaxation time parameter δ c .