Entropy generation in rotating Casson nanofluid bio-convection with nonlinear thermal radiation and velocity slip effects
Results in Surfaces and Interfaces, cilt.25, 2026 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 25
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.rsurfi.2026.101004
- Dergi Adı: Results in Surfaces and Interfaces
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
- Anahtar Kelimeler: Bejan number, Bioconvection, Brownian motion, Casson nanofluid, Entropy generation, Gyrotactic microorganisms, Nonlinear thermal radiation, Rotating flow, Thermophoresis, Velocity slip
- Karadeniz Teknik Üniversitesi Adresli: Hayır
Özet
The present study investigates the thermodynamic behavior of 3-dimensional rotating Casson nanofluid containing gyrotactic microorganisms under the combined impacts of non-linear thermal radiation, velocity slip, magnetic field, Brownian, thermophoretic diffusion, porous medium resistance, and convective boundary conditions. The modified Buongiorno nanofluid model is employed to characterize nanoparticle transfer mechanisms, while bioconvection induced by motile microorganisms is incorporated to improve the physical practicality of the flow system. Particular emphasis is placed on entropy production and Bejan number assessments to quantify thermodynamic irreversibilities occurring from heat transmission, fluid frictions, viscous dissipation, and mass diffusion processes. The resulting dimensionless boundary value problem is solved numerically through the MATLAB bvp4c solver. The numerical outcomes display that increasing the rotation parameter suppresses fluid motion, whereas higher values of the Casson parameter significantly decrease the fluid velocity. The temperature profile is significantly improved by rising the thermal radiative parameter and Biot number. Furthermore, the motile microorganisms density increases with stronger buoyancy effects. The thermodynamic exploration establishes that entropy production improves considerably with improving Brinkman and Reynolds numbers because of intensified viscous dissipative flux, fluid friction, and stronger velocity gradients within the boundary layer. Conversely, the Bejan numbers decrease with rising Brinkman number, indicating a transition from heat transmission controlled irreversibility to fluid-friction-dominated irreversibility. However, increasing the radiation parameter elevates Bejan numbers, signifying the growing dominance of thermal irreversibility associated with radiative heat transfer. The outcomes focus the critical role of viscous dissipation, inertial effects, and thermal radiation in controlling entropy production and energy losses, thereby offering valuable guidelines for the thermodynamic optimization of advanced nanofluid-based thermal management, biomedical, and energy transport systems.