Conjugate direct resistance heating of metallic plates. multiplicities and stability DOI
Rizos N. Krikkis

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

A numerical bifurcation analysis is presented for an industrial application where direct resistance heating through a DC applied to flat metallic plate, which cooled by turbulent boundary layer and radiation. The process modeled with conjugate heat transfer between the plate cooling air steam. convective part of mechanism formulated in framework integral approach, considering core based on power law velocity temperature profiles thin laminar sublayer thermally coupled axial conduction along plate. reveals that problem admits two solutions: one stable unstable, separated limit point. existence multiple solutions consequence nonlinear electric resistivity–temperature relationship, allowing thermal equilibrium generation dissipation points. realistic conditions at wall–fluid interface shows hydrodynamic thicknesses ratio no longer close value 1.25, as it case constant wall temperature. Instead, significant deviations occur due coupling fluid. multiplicity structure and, consequently, points depend Reynolds number conduction–convection parameter. locus defines instability threshold beyond any excess current will trigger runaway phenomenon. This also equivalent maximum carrying capacity

Language: Английский

A comprehensive review on the Dynamical behavior of heat and fluid flow mechanism: Thermal performance across different geometries DOI Creative Commons
Hossam A. Nabwey, Muhammad Ashraf, Zia Ullah

et al.

Partial Differential Equations in Applied Mathematics, Journal Year: 2024, Volume and Issue: 11, P. 100808 - 100808

Published: July 8, 2024

The prominent novelty of current review is to exhibit the fluctuating and oscillatory convective heat transfer properties along various geometries with magnetic force, variable density, Prandtl number, buoyancy force number effects. significance present work illustrate a comprehensive on transient transfer. Transient plays an essential role in technological environmental applications, including climate control, structure safety, engines, thermal computer heating cooling, energy safety. literature primarily focuses steady temperature velocity domains, few studies exploring time-varying fluid flow forced, natural, or mixed mechanisms different methods. In review, justification results was performed by using oscillating stokes conditions directly partial differential models. similarity variables stream functions are used but primitive transformation implicit form finite difference method Gaussian elimination technique through FORTRAN Tecplot-360 programming tools. governing model reduced into steady, real imaginary explore transmission. flows have gained due their ability achieve large rates. Compared movement, higher variations heated surface. Periodic produces improved surface transmission rate than flow. Predicting controlling transients exchangers requires concept forced convection transport. solutions important for ensuring effectiveness reliability electrical components, nuclear power stations, heat-generating steam turbines, condensation systems, catalytic converters, shielding spacecraft, devices, internal combustion air conditioning refrigerator cooling networks batteries, generators, transformers. It found that frequency transport enhances periodic variables. depicted amplitude displayed each choice parameter around two angles π/4 π circular magnetized maximum reported vertical angle π/2 values.

Language: Английский

Citations

5
A numerical analysis of magnetohydrodynamic water-based AA7072 nanofluid flow over a permeable stretching surface with slip conditions DOI
Anwar Ali Aldhafeeri, Humaira Yasmin

Journal of Radiation Research and Applied Sciences, Journal Year: 2025, Volume and Issue: 18(2), P. 101356 - 101356

Published: Feb. 26, 2025

Language: Английский

Citations

0
Steady and Periodical Heat-Mass Transfer Behavior of Mixed Convection Nanofluid with Reduced Gravity, Radiation and Activation Energy Effects DOI Creative Commons
Cyrus Raza Mirza, Zia Ullah, A. Dahshan

et al.

Case Studies in Thermal Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 105376 - 105376

Published: Oct. 1, 2024

Language: Английский

Citations

3
Economic and Exergy Analysis of TiO2 + SiO2 Ethylene-Glycol-Based Hybrid Nanofluid in Plate Heat Exchange System of Solar Installation DOI Creative Commons
Sylwia Wciślik, Dawid Taler

Energies, Journal Year: 2024, Volume and Issue: 17(13), P. 3107 - 3107

Published: June 24, 2024

This paper concerns an economic and exergetic efficiency analysis of a plate heat exchanger placed in solar installation with TiO2:SiO2/DI:EG nanofluid. device separates the primary circuit—with fluid—and secondary circuit—in which domestic hot water flows (DHW). The fluid is TiO2:SiO2 nanofluid concentration range 0.5–1.5%vol. T = 60 °C. Its flow maintained at constant level 3 dm3/min. heat-receiving medium initial temperature 30 work records DHW V˙DHW,in 3–6(12) In order to calculate exergy system, first, total destruction, entropy generation number Ns, Bejan Be are determined. Only for comparable flow, V˙nf=V˙DHW dm3/min, concentrations 0 0.5%vol. there no significant improvement efficiency. other cases, presence nanoparticles significantly improves transfer. even 13 26% more effective working than traditional fluid; Re 329, ηexergy 37.29%, nanoparticle 0% ηexergy(1.5%vol.) 50.56%; 430, ηexergy(0%) 57.03% ηexergy(1.5%) 65.9%.

Language: Английский

Citations

2
A Molecular Dynamics Study of the Effect of Initial Pressure on the Mechanical Resilience of Aluminum Polycrystalline DOI Creative Commons

Ali B.M. Ali,

Dheyaa J. Jasim,

As’ad Alizadeh

et al.

Results in Engineering, Journal Year: 2024, Volume and Issue: 24, P. 102879 - 102879

Published: Sept. 12, 2024

Language: Английский

Citations

2
Heat and Mass Transfer within Unsteady Nanofluid Movement in the Presence of Sustained Solar Radiation DOI
Girma Tafesse Workneh, Mitiku Daba Firdi

Journal of Nanofluids, Journal Year: 2024, Volume and Issue: 13(3), P. 819 - 830

Published: June 1, 2024

The unsteady movement of nanofluid on porous inclined media is essential for absorbing and transferring heat from solar radiation. From renewable energy sources, limitless, sustainable universally accessible without creating conflict. In this study, mass transfer have been explored by unsteadily moving with the occurrence Sun rays viscous dissipation. Tiwari-Das Darcy-Forchheimer models are encompassed convective suction/injection. Then, non-linear higher-order set ordinary differential equations was obtained fundamental partial using similarity transformation. Both semi-analytical numerical strategies adopted. Comparisons published articles detected observed similar outcomes. Accordingly, thermal Grashof number elevates motion while postponing drag force creation. Permeability Darcy’s publicized a contradictory trend in nanofluid’s temperature. Nanofluid’s temperature expands incident radiation Eckert but not absorption. There less rate than conductive through magnifying magnetic field nanoparticles’ concentration. Nanofluid constructed Cu–H 2 O produces more that Cu–C 3 H 8 . Heat applicable cooking, heating water producing electricity.

Language: Английский

Citations

0
Conjugate direct resistance heating of metallic plates. multiplicities and stability DOI
Rizos N. Krikkis

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

A numerical bifurcation analysis is presented for an industrial application where direct resistance heating through a DC applied to flat metallic plate, which cooled by turbulent boundary layer and radiation. The process modeled with conjugate heat transfer between the plate cooling air steam. convective part of mechanism formulated in framework integral approach, considering core based on power law velocity temperature profiles thin laminar sublayer thermally coupled axial conduction along plate. reveals that problem admits two solutions: one stable unstable, separated limit point. existence multiple solutions consequence nonlinear electric resistivity–temperature relationship, allowing thermal equilibrium generation dissipation points. realistic conditions at wall–fluid interface shows hydrodynamic thicknesses ratio no longer close value 1.25, as it case constant wall temperature. Instead, significant deviations occur due coupling fluid. multiplicity structure and, consequently, points depend Reynolds number conduction–convection parameter. locus defines instability threshold beyond any excess current will trigger runaway phenomenon. This also equivalent maximum carrying capacity

Language: Английский

Citations

0