Magnetic field effect on mixed convection flow inside an oval-shaped annulus enclosure filled by a non-Newtonian nanofluid

International Journal of Thermofluids, Год журнала: 2024, Номер 21, С. 100571 - 100571

Опубликована: Янв. 15, 2024

The phenomenon of flow around a static or rotating circular cylinder has significant applications in various engineering fields, such as building, bridge, and structure engineering. It can be used to control flow-induced vibration, blowing suction, moving surfaces, acoustic thriller, synthetic jet. Additionally, there is need enhance heat transfer rates many life industrial applications, including cavity shape enhancement, heating cooling spread inside cavity, dissipation electronic devices, thermal mixing storage units, solar collectors, desalination, journal bearing lubrication. This study explores the effect horizontal magnetic field inner on mixed convection within two-dimensional oval-shaped enclosure filled with non-Newtonian nanofluid. Galerkin Finite Element Method (GFEM) utilized for analysis, undergoing differential wall wall, respectively. nanofluid consists water infused copper nanoparticles. simulation parameters, Richardson number (Ri), Hartmann (Ha), inclination angle (β), power-law index (n), circle center eccentricity (e), nanoparticles volume fraction (φ). been observed that Ha n increase different Ri values, wavy trend local Nusselt (Nu) profiles along source surface observed. rate decreases increasing combinations index. Under specific conditions, = 0.001, 60, e 0, φ 0.09, β 90, results show that, compared Newtonian fluid (n 1), exhibits percentage gains approximately 6.31% pseudo-plastic 0.6) 8.47% Dilatant 1.4). convective was significantly enhanced when positioned lower upper regions enclosure, particularly at - 0.3. highest were 60 240.

Язык: Английский

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Unveiling the Dynamics of Entropy Generation in Enclosures: A Systematic Review

International Journal of Thermofluids, Год журнала: 2024, Номер 21, С. 100568 - 100568

Опубликована: Янв. 9, 2024

This extensive review aims to provide a thorough understanding of entropy generation (Egen) in confined conduits, or enclosures, by examining vast array peer-reviewed research. The covers various studies on Egen enclosures with different geometric configurations and highlights the significant effects thermo-physical dynamics, such as temperature gradient, viscous dissipation, frictional drag, magnetic field strength, characterization. broad range that investigate diverse types fluids, including air, water, nanofluids. Furthermore, also includes enclosure structures, I, L, C, U, semicircular, triangular, square, rectangular, rhombic, trapezoidal, polygonal, channel types, well wavy wall configurations. Notably, encompasses both 2D 3D cases present complete comprehension conduits. In addition, carefully evaluates validity methods utilized numerical investigations, incorporating mesh sizes A examination literature demonstrates obstacles, single multiple rotating cylinders, exhibit noticeable increase Egen. Also, use nanofluids significantly increases These findings have important practical implications analysis thermofluid systems, but not limited heat exchangers, chip cooling, food storage, solar ponds, nuclear reactor systems. Based comprehensive conducted this study, several future research directions been proposed for emerging enclosures. study explores intricate mechanisms potential avenues further investigation area. insights will contribute advancement knowledge base applications

Язык: Английский

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Numerical investigation of thermal and entropy generation characteristics in a sinusoidal corrugated channel under the influence of sinusoidal wall temperature

International Journal of Thermofluids, Год журнала: 2024, Номер 22, С. 100706 - 100706

Опубликована: Май 1, 2024

The corrugated channels play a vital role in many engineering applications, such as electronic cooling and heat exchanger devices; thus, forced convection transfer entropy generation within the are important subjects to investigate. This study numerically investigated laminar of water flow sinusoidal channel. channel walls were subjected wall temperature heating while varying wave parameters. finite element method had been employed solve governing equation, simulation results conducted for Reynolds number 5 ≤ Re 500, dimensionless wavelength 0.25 λth 2.25, Prandtl Pr = 6.93. main findings depicted terms Nusselt number, skin friction coefficient, effectiveness, total generation, Bejan contours, well being compared with uniform heating. In addition, demonstrated that significantly improved < 1.75 all ranges critical was found, where showed higher rate non-uniform at ≥ . Besides that, it is found has lower than heating, except 0.25. investigation recommends more effective by 7.5, 2.78, 1.9, 1.52, 1.34 factors 0.25, 0.75, 1.25, respectively.

Язык: Английский

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Magnetic field effects on double-diffusive mixed convection and entropy generation in a cam-shaped enclosure

International Communications in Heat and Mass Transfer, Год журнала: 2024, Номер 159, С. 108166 - 108166

Опубликована: Окт. 9, 2024

Язык: Английский

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Nonlinear normalized fractional electroosmotic spacelike fluid model

International Journal of Thermofluids, Год журнала: 2025, Номер unknown, С. 101057 - 101057

Опубликована: Янв. 1, 2025

Язык: Английский

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Hybrid nanofluid mixed convection in a lid-driven wavy cavity with internal heated plate

Results in Surfaces and Interfaces, Год журнала: 2025, Номер unknown, С. 100469 - 100469

Опубликована: Фев. 1, 2025

Язык: Английский

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On the corrugation effect on thermo-fluids characteristics and entropy generation in channels equipped with wavy and straight sections

Journal of Engineering Research, Год журнала: 2024, Номер unknown

Опубликована: Май 1, 2024

A numerical simulation was performed to investigate the characteristics of thermo-fluids and irreversibility generation laminar forced convection through three different channel designs. This article first presents a comprehensive study combination straight wavy sections in order create balance between improved thermal performance from design optimized flow properties section, leading an overall enhancement cooling efficiency. novel has been considered using configuration that consists lengths is named (cases I, II, III). The outcomes are shown terms average Nu, ratio (ER), factor, total generation, as well contours streamlines, isothermal, Bejan numbers for values Reynolds number range 5≤Re≤400 dimensionless wave amplitude 0.3≤α≤0.6. results were compared cases with plane channel, revealing augmentation HTR 73.7%, 64.9%, 43.3% III, respectively. On other hand, both Re α, increases continuously.

Язык: Английский

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Characteristics of thermo‐hydraulic flow inside corrugated channels: Comprehensive and comparative review

Heat Transfer, Год журнала: 2024, Номер 53(8), С. 4285 - 4315

Опубликована: Июль 26, 2024

Abstract Previous works that investigated the characteristics of heat transfer and fluid flow in channels with corrugated walls have been extensively reviewed this study. In accordance fast increase power consumption requirements, many researchers a new approach for cooling techniques can enhance performance devices without consuming more power. To improve efficiency energy systems, investigators engineers implement promising such as surface optimization additives passive methods to augment rates transfer. Researchers different corrugation profiles along various working fluids well external further exchange process thermal systems. The aim article is give clear preview effects parameters wave parameters, Reynolds number, type fluid, pulsating condition on average local Nusselt pressure drop, factors, irreversibility. main findings are listed tables depicted figures, matter helps choose suitable channel shape their applications.

Язык: Английский

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Aspect ratio variation influence in minimizing entropy production generated by buoyancy driven flow of Newtonian fluid in L-shaped enclosure

Proceedings of the Institution of Mechanical Engineers Part N Journal of Nanomaterials Nanoengineering and Nanosystems, Год журнала: 2025, Номер unknown

Опубликована: Апрель 12, 2025

Minimizing entropy generation boosts the efficacy of thermal engineering systems by reducing energy losses. This method maximizes fuel cells, nuclear, and geothermal reactors, electronic heating cooling, photovoltaic storage energy, processing food. Entropy control is essential for contemporary heat conveyance uses because it enhances efficiency, sustainability, saving energy. Thus, this work presents a detailed investigation fluidic transmission entropic fluctuations caused enclosure aspect ratio change in naturally convective water flow an L-shaped chamber. Conservation rules are used to represent issue dimensional governing equations. After that, variables make constitutive equations dimensionless. The finite element (FEM) COMSOL Multiphysics solve issue. Graphs show viscous versus settings. Nusselt number total calculated against various factors. Comparing current data published research ensures accuracy. A step height produces more than width. decreases as Rayleigh ( Ra ) increases, but increases. Additionally, outperforms low irreversibility parameters. study suggests that temperature gradients contribute at levels, whereas forces Ra > 10 4 . (6.0955) (1033.9) peak Pr = 7 . 0 When ϕ − 3 , reaches its maximum value 70.

Язык: Английский

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CFD‐Enabled Design Optimization of Natural Convection and Entropy Generation in a Porous Quarter‐Circular Cavity

Heat Transfer, Год журнала: 2025, Номер unknown

Опубликована: Май 16, 2025

ABSTRACT Natural convection and entropy generation through cavities, including quarter‐circular ones containing porous media, are vital in many thermal engineering application systems. This study introduces a novel approach by investigating the hydrothermal performance of cavity using response surface methodology (RSM) integrated with computational fluid dynamics (CFD) simulation. The multiobjective optimization design is consideration to enhance heat transfer represented Nusselt number ( Nu m ) hot wall temperature T h minimization En skin friction coefficient SFC ). These optimizations considered under varying parameters, inclination angle (0° ≤ θ 360°), applied flux (5 × 10 3 Q 25 W/m 2 , aspect ratio (1 R 3), porosity (0.15 ɛ 0.85), pore per inch (10 PPI 30), cold (5°C c 25°C). key findings indicate that optimum enhances nearly 6.2 times at = 5 while reducing SCF approximately 86.96%, 94.43%, 99.39%, respectively, as optimal conditions 1, 0.05, 30, 5°C, 0°. accuracy RSM estimating CFD results for demonstrated comparing expected actual results. Thus, this investigation supports effectiveness since it improves porous‐enclosure systems significantly reduces computation costs maintaining high data accuracy.

Язык: Английский

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