Irreversibility process analysis for /water-based flow over a rotating and stretching cylinder.

Area of Science:

• Thermodynamics
• Fluid Mechanics
• Heat Transfer

Background:

• Entropy quantifies unavailable energy, impacting thermodynamic efficiency.
• Entropy generation analysis is key for optimizing thermo-fluid systems and minimizing power loss.
• Applications span biological, information, and engineering systems.

Purpose of the Study:

• Analyze entropy generation in magnetohydrodynamic hybrid nanofluid flow.
• Investigate the effects of rotating/stretching cylinder, heat radiation, ohmic heating, and magnetic fields.
• Compare heat transfer and entropy generation between nanofluids and hybrid nanofluids.

Main Methods:

• Utilized the Maxwell model for thermal energy transport in hybrid nanofluids.
• Applied convective boundary conditions for heat transport.
• Solved dimensionless ordinary differential equations using the bvp4c program in MATLAB.

Main Results:

• Hybrid nanofluids show higher heat transfer rates but increased entropy generation compared to nanofluids.
• Increased solid volume fraction enhances flow and heat distribution.
• Brinkman number and temperature ratio augment entropy; Bejan number decreases.
• Nusselt number decreases with magnetic field and Eckert number; wall stress decreases with Reynolds number.

Conclusions:

• Hybrid nanofluids offer improved heat transfer but necessitate careful management of entropy generation.
• Flow and thermal characteristics are significantly influenced by solid volume fraction and operational parameters.
• The study provides insights into optimizing thermal performance and minimizing irreversibility in such systems.