This review examines a recent study published in Teknomekanik that explores the influence of exponentially varying viscosity on magnetized tangent hyperbolic nanofluids flowing over a nonlinear stretching sheet. The review highlights the research objectives, numerical methodology, key findings, scientific contributions, research limitations, and future opportunities for advanced thermal engineering and heat-transfer technologies.
Article Review
Bibliographic Information
| Title | The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions |
|---|---|
| Authors | Mohamed Magdy Ghazy, Khalid Saad Mekheimer, Rabea Elshennawy Abo-Elkhair, Ahmed Mostafa Megahed |
| Journal | Teknomekanik |
| Volume & Issue | Volume 8, Issue 1 |
| Publication Year | 2025 |
| Pages | 1–23 |
| DOI | https://doi.org/10.24036/teknomekanik.v8i1.33772 |
| Publisher | Universitas Negeri Padang |
| License | Creative Commons Attribution 4.0 International (CC BY 4.0) |
Overview
This study presents a comprehensive numerical investigation of magnetized tangent hyperbolic nanofluid flow over a nonlinear exponentially stretching sheet, incorporating temperature-dependent exponential viscosity, Darcy porous media, prescribed heat flux (PHF), and prescribed mass flux (PMF) boundary conditions. The research addresses an important gap in non-Newtonian fluid mechanics by integrating several complex physical phenomena into a single mathematical model, making it particularly relevant to advanced thermal management systems in aerospace, electronics cooling, automotive engineering, renewable energy, and industrial filtration.
Research Objective
The primary objective of this study is to investigate how exponentially varying viscosity influences the momentum, heat transfer, and mass transfer characteristics of a magnetohydrodynamic (MHD) tangent hyperbolic nanofluid flowing over an exponentially stretching surface under PHF and PMF boundary conditions.
More specifically, the research aims to evaluate the combined effects of:
- temperature-dependent viscosity,
- magnetic field intensity,
- porous medium permeability,
- suction and injection,
- Brownian motion,
- thermophoresis,
- and nonlinear stretching
on fluid velocity, temperature distribution, nanoparticle concentration, skin friction, Nusselt number, and Sherwood number.
Why This Research Matters
Efficient thermal management is essential in numerous engineering applications, including:
- electronic cooling systems
- electric vehicles
- aerospace engineering
- renewable energy technologies
- polymer processing
- advanced manufacturing
- biomedical thermal systems
The performance of these systems strongly depends on accurate prediction of fluid flow, heat transfer, and nanoparticle transport. By integrating multiple physical mechanisms into one computational framework, this study contributes to the development of more realistic numerical models for future thermal management technologies.
Research Methodology
This work is a computational and numerical modeling study rather than an experimental investigation.
The methodology consists of several major steps:
- Developing the governing partial differential equations describing tangent hyperbolic nanofluid flow.
- Transforming the governing equations into ordinary differential equations using similarity transformations.
- Solving the transformed equations numerically through the Chebyshev Spectral Method (Chebyshev Collocation Method).
- Validating the numerical results by comparing them with previously published benchmark studies.
- Examining the influence of multiple dimensionless parameters on:
- velocity profiles,
- temperature distributions,
- nanoparticle concentration,
- skin friction coefficient,
- local Nusselt number,
- local Sherwood number.
Key Findings
The study reports several important findings.
1. Variable viscosity significantly affects flow behavior
Increasing the variable-viscosity parameter reduces the fluid velocity while simultaneously increasing both temperature and nanoparticle concentration. This demonstrates that temperature-dependent viscosity plays a critical role in regulating transport phenomena in non-Newtonian nanofluids.
2. Higher power-law index suppresses fluid motion
An increase in the power-law index decreases fluid velocity but enhances thermal and concentration boundary layers, indicating stronger resistance to deformation in tangent hyperbolic fluids.
3. Magnetic field reduces heat and mass transfer rates
A stronger magnetic field generates a Lorentz force that suppresses fluid motion, leading to lower local Nusselt and Sherwood numbers and consequently reducing heat and mass transfer efficiency.
4. Numerical predictions show excellent agreement with previous studies
Comparison with established benchmark results confirms the accuracy and robustness of the proposed numerical approach, supporting the reliability of the Chebyshev Spectral Method for solving highly nonlinear boundary-layer problems.
Scientific Contribution
The major contribution of this work lies in combining several advanced physical mechanisms that are rarely investigated simultaneously, including:
- exponentially varying viscosity,
- magnetohydrodynamics (MHD),
- tangent hyperbolic non-Newtonian nanofluid,
- Darcy porous medium,
- prescribed heat flux (PHF),
- prescribed mass flux (PMF),
- nonlinear exponential stretching surfaces.
This integrated framework provides a more realistic mathematical representation of thermal-fluid systems than many earlier models, making it valuable for future developments in advanced cooling technologies and industrial heat-transfer applications.
Research Limitations
Although the study offers meaningful theoretical contributions, several limitations remain.
Numerical validation only
The proposed model has not yet been validated through laboratory experiments or industrial-scale testing, limiting its immediate practical verification.
Two-dimensional flow assumption
The analysis is confined to a two-dimensional boundary-layer model, whereas many engineering applications involve fully three-dimensional flow fields.
Simplified nanoparticle representation
The model does not investigate the influence of different nanoparticle materials, particle shapes, or particle-size distributions that may substantially affect heat-transfer performance.
Limited physical complexity
Important engineering phenomena such as turbulence, radiation-dominated environments, chemical reactions, phase changes, and transient operating conditions are beyond the scope of the current model.
Future Research Opportunities
This article opens several promising directions for future investigations, including:
- experimental validation of the proposed mathematical model;
- extension to three-dimensional and transient flow configurations;
- investigation of hybrid and ternary nanofluids;
- integration with commercial CFD platforms such as ANSYS Fluent or COMSOL Multiphysics;
- optimization using artificial intelligence and machine learning techniques;
- applications in electric vehicle battery cooling;
- thermal management for additive manufacturing systems;
- high-performance electronic cooling devices;
- digital twin development for advanced thermal-fluid systems.
Potential for Public Policy Citation (Overton)
Although this article is primarily a fundamental engineering study, several aspects increase its potential relevance for policy-oriented technical reports and innovation roadmaps indexed by Overton.
The strongest policy relevance includes:
- Energy efficiency, through improved thermal management technologies that reduce energy consumption.
- Sustainable industrial manufacturing, by enabling more efficient cooling systems for advanced production processes.
- Electronics and semiconductor cooling, supporting the reliability of high-performance computing infrastructure and data centers.
- Renewable energy technologies, particularly thermal optimization in solar-energy systems.
- National nanotechnology and advanced manufacturing strategies, where improved thermal transport materials contribute to innovation and industrial competitiveness.
Consequently, the study is more likely to be cited in government technical reports, engineering standards, industrial innovation roadmaps, clean-energy strategies, and advanced manufacturing policy documents than in regulatory or legislative policy papers. This translational relevance enhances its long-term potential for policy impact beyond the academic literature.
Who Should Read This Paper?
This article is particularly valuable for:
- mechanical engineers
- thermal engineers
- CFD researchers
- applied mathematicians
- materials scientists
- nanotechnology researchers
- graduate students working on non-Newtonian fluids
- researchers developing advanced cooling systems
Final Thoughts
This article presents a rigorous numerical investigation into one of the most challenging topics in computational heat transfer. By combining variable viscosity, magnetohydrodynamics, porous media, and prescribed thermal boundary conditions within a unified computational framework, the authors provide valuable theoretical insights that can support future developments in advanced thermal management technologies.
While experimental validation remains necessary before industrial implementation, the proposed model offers an excellent foundation for future numerical, experimental, and multidisciplinary research.
Suggested Citation
Teknomekanik (UNP) Style
Ghazy, M.M., Mekheimer, K.S., Abo-Elkhair, R.E., & Megahed, A.M. (2025). The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions. Teknomekanik, 8(1), 1–23. https://doi.org/10.24036/teknomekanik.v8i1.33772
APA (7th Edition)
Ghazy, M. M., Mekheimer, K. S., Abo-Elkhair, R. E., & Megahed, A. M. (2025). The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions. Teknomekanik, 8(1), 1–23. https://doi.org/10.24036/teknomekanik.v8i1.33772
IEEE Style
M. M. Ghazy, K. S. Mekheimer, R. E. Abo-Elkhair, and A. M. Megahed, "The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions," Teknomekanik, vol. 8, no. 1, pp. 1–23, 2025, doi: 10.24036/teknomekanik.v8i1.33772.
Harvard Style
Ghazy, M.M., Mekheimer, K.S., Abo-Elkhair, R.E. and Megahed, A.M. (2025) 'The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions', Teknomekanik, 8(1), pp. 1–23. Available at: https://doi.org/10.24036/teknomekanik.v8i1.33772.
Vancouver Style
Ghazy MM, Mekheimer KS, Abo-Elkhair RE, Megahed AM. The impact of exponentially varying viscosity on magnetized tangent hyperbolic nanofluid over a nonlinear stretching sheet with PHF and PMF conditions. Teknomekanik. 2025;8(1):1–23. doi: 10.24036/teknomekanik.v8i1.33772.
Chicago (Author–Date)
Ghazy, Mohamed Magdy, Khalid Saad Mekheimer, Rabea Elshennawy Abo-Elkhair, and Ahmed Mostafa Megahed. 2025. "The Impact of Exponentially Varying Viscosity on Magnetized Tangent Hyperbolic Nanofluid over a Nonlinear Stretching Sheet with PHF and PMF Conditions." Teknomekanik 8 (1): 1–23. https://doi.org/10.24036/teknomekanik.v8i1.33772.
MLA (9th Edition)
Ghazy, Mohamed Magdy, et al. "The Impact of Exponentially Varying Viscosity on Magnetized Tangent Hyperbolic Nanofluid over a Nonlinear Stretching Sheet with PHF and PMF Conditions." Teknomekanik, vol. 8, no. 1, 2025, pp. 1–23. https://doi.org/10.24036/teknomekanik.v8i1.33772.
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