Coupled Magneto–Thermal–Diffusion Transport in an Unsteady Maxwell Polymer Fluid with Activation Energy over a Porous Stretching Surface

Year : 2026 | Volume : 14 | Special Issue 01 | Page : 581 590
    By

    B. Vishali,

  • A. Haritha,

  • C. Venkata Lakshmi,

  • Sridevi Dandu,

  1. Assistant Professor, Department of Applied Mathematics, Sri Padmavati Mahila Visvavidyalayam, Tirupati, Andhra Pradesh, India
  2. Assistant Professor, Department of Basic Sciences and Humanities, School of Engineering and Technology, Sri Padmavati Mahila Visvavidyalayam, Tirupati, Andhra Pradesh, India
  3. Assistant Professor, Department of Applied Mathematics, Sri Padmavati Mahila Visvavidyalayam, Tirupati, Andhra Pradesh, India
  4. Assistant Professor, Department of Engineering Mathematics & Humanities, S.R.K.R. Engineering College, Bhimavaram, West Godavari District, Andhra Pradesh, India

Abstract

The present study investigates the combined effects of activation energy and diffusion-thermo (Dufour) processes on unsteady magnetohydrodynamic (MHD) flow, heat, and mass transfer of a Maxwell viscoelastic fluid past a porous exponentially stretching vertical sheet. The electrically conducting and incompressible polymeric fluid flows through a saturated porous medium under a transverse magnetic field. The governing momentum, energy, and concentration equations are transformed into nonlinear ordinary differential equations using similarity transformations and solved numerically using the fourth-order Runge–Kutta shooting method. The influence of key parameters such as magnetic field strength, porosity, relaxation time, activation energy, Dufour number, Prandtl number, and Schmidt number on the velocity, temperature, and concentration profiles is analyzed graphically. Additionally, the variations of the skin friction coefficient, Nusselt number, and Sherwood number are computed and presented to examine heat and mass transfer behavior. The results show that an increase in the magnetic parameter suppresses the velocity due to the Lorentz force, while higher relaxation time enhances elastic effects in the Maxwell fluid. Activation energy increases concentration distribution by reducing the chemical reaction rate, whereas the Dufour effect elevates temperature because of cross-diffusion between heat and mass transfer. These outcomes are relevant in polymer extrusion, chemical processing, geothermal systems, and thermal regulation of electrically conducting fluids in porous structures.

Keywords: Activation energy, dufour effect, magnetohydrodynamics, maxwell polymer fluid, porous medium.

[This article belongs to Special Issue under section in Journal of Polymer & Composites (jopc)]

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How to cite this article:
B. Vishali, A. Haritha, C. Venkata Lakshmi, Sridevi Dandu. Coupled Magneto–Thermal–Diffusion Transport in an Unsteady Maxwell Polymer Fluid with Activation Energy over a Porous Stretching Surface. Journal of Polymer & Composites. 2025; 14(01):581-590.
How to cite this URL:
B. Vishali, A. Haritha, C. Venkata Lakshmi, Sridevi Dandu. Coupled Magneto–Thermal–Diffusion Transport in an Unsteady Maxwell Polymer Fluid with Activation Energy over a Porous Stretching Surface. Journal of Polymer & Composites. 2025; 14(01):581-590. Available from: https://journals.stmjournals.com/jopc/article=2025/view=233408


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Special Issue Subscription Original Research
Volume 14
Special Issue 01
Received 03/11/2025
Accepted 15/11/2025
Published 04/12/2025
Publication Time 31 Days
174

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