Electro-enhanced natural convection analysis for an Al2O3-water-filled enclosure by considering the effect of thermal radiation DOI
Seyyed Masoud Seyyedi, M. Hashemi‐Tilehnoee, Elena Palomo del Barrio

et al.

Numerical Heat Transfer Part A Applications, Journal Year: 2023, Volume and Issue: unknown, P. 1 - 20

Published: Aug. 11, 2023

AbstractOne of the most crucial topics in thermal sciences is analysis how an external electric field affects natural convection flow. In this study, heat transfer electro-hydrodynamic enclosure with a wavy hot wall numerically studied. Al2O3-water nanofluid considered as working fluid, and furthermore, effect radiation on characteristics fluid flow simulated. Non-dimensional forms governing equations are solved using control volume finite element method. The effects operational parameters such Rayleigh number, nanoparticles volume-fraction, Lorentz force Eckert charge diffusivity number maximum absolute value stream function average Nusselt investigated. Two new defined to evaluate contribution electrical results show that Nuave ascends 7.95% when ϕ increases from 0 0.05 at Ra=105. Also, values |Ψmax| increase 27.6% 37.2%, respectively, λ goes up 0.5 Rd=1.0. decrease 48.7% 27.1%, decreasing amplitude parameter (an) 0.1 0.3 Ra=105.Keywords: CVFEMelectric fieldnanofluidnatural convectionthermal

Language: Английский

Characteristics of natural convection heat transfer in composite cavity DOI Creative Commons
Changkui Lei, Y. D. Zhu,

Suntong Qiu

et al.

Case Studies in Thermal Engineering, Journal Year: 2024, Volume and Issue: 56, P. 104254 - 104254

Published: March 13, 2024

In order to study the influence of nature mining airspace on natural convection heat transfer in unventilated working face, we establish a numerical model composite cavity containing porous media by CFD method. The effects different Rayleigh numbers (Ra), thicknesses, and porosities ε temperature velocity fields dissipation from source were comparatively analyzed. results show that larger Ra is, stronger flow cavity; when thickness increases 0.2 0.75, average Nussel number (Nuave) high-temperature wall surface decreases 40.38%, Nuave interfaces 6.15%, maximum dimensionless boundary layer region 10,771 3775, horizontal line center 0.05, indicating are affected Ra. Temperature decreased demonstrating increase will weaken strength fluid side transfer; porosity increased 0.8, interfacial 5.61%, makes area enhancement, but has certain weakening effect domain. can be used for coal provide some reference value avoiding thermal damage mechanical equipment.

Language: Английский

Citations

3
Convection flow of nano-encapsulated phase change material in wavy chamber with double sliding walls, flame-shaped heating source, and magnetic force DOI Creative Commons
Aissa Abderrahmane, Naef A.A. Qasem, Abdeldjalil Belazreg

et al.

Case Studies in Thermal Engineering, Journal Year: 2024, Volume and Issue: 56, P. 104250 - 104250

Published: March 15, 2024

This article aims to improve the convection flow within a two-dimensional chamber by utilizing nano-encapsulated phase change material (NEPCM). The center contains flame-shaped heating source, and bottom wall is wavy. Forced occurs due motion of chamber's side walls, while natural arises from thermal gradient across walls. Galerkin-finite element GFEM approach was employed analyze system's governing equations. study investigates impact following factors on heat transfer: velocity (Re = 10–1000), movement directions (both walls moving in positive direction, both negative one other positive), intensity magnetic field (Ha 0–100), cavity porosity (Da 10−5 – 10−2). results demonstrate that increasing Re Da improves average Nusselt number (NuAvg). Conversely, raising opposite direction reduces NuAvg. At 1000, (10−2 instead 10−5) leads 139% increase NuAvg, decreasing Ha same NuAvg 11.5% 640%, respectively.

Language: Английский

Citations

3
Numerical investigation of MHD natural convection in a hexagonal enclosure with heated corrugated cylinder DOI
Zeeshan Badshah, Kejia Pan, Murad Ali Shah

et al.

The European Physical Journal Plus, Journal Year: 2024, Volume and Issue: 139(8)

Published: Aug. 8, 2024

Language: Английский

Citations

3
Numerical Analysis of Entropy Generation and Heat Transfer of Ternary Nanofluids under a Periodic Magnetic Field in a Square Enclosure DOI Creative Commons
Seyyed Masoud Seyyedi, M. Hashemi‐Tilehnoee, Elena Palomo del Barrio

et al.

Case Studies in Thermal Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 105947 - 105947

Published: Feb. 1, 2025

Language: Английский

Citations

0
Electro-enhanced natural convection analysis for an Al2O3-water-filled enclosure by considering the effect of thermal radiation DOI
Seyyed Masoud Seyyedi, M. Hashemi‐Tilehnoee, Elena Palomo del Barrio

et al.

Numerical Heat Transfer Part A Applications, Journal Year: 2023, Volume and Issue: unknown, P. 1 - 20

Published: Aug. 11, 2023

AbstractOne of the most crucial topics in thermal sciences is analysis how an external electric field affects natural convection flow. In this study, heat transfer electro-hydrodynamic enclosure with a wavy hot wall numerically studied. Al2O3-water nanofluid considered as working fluid, and furthermore, effect radiation on characteristics fluid flow simulated. Non-dimensional forms governing equations are solved using control volume finite element method. The effects operational parameters such Rayleigh number, nanoparticles volume-fraction, Lorentz force Eckert charge diffusivity number maximum absolute value stream function average Nusselt investigated. Two new defined to evaluate contribution electrical results show that Nuave ascends 7.95% when ϕ increases from 0 0.05 at Ra=105. Also, values |Ψmax| increase 27.6% 37.2%, respectively, λ goes up 0.5 Rd=1.0. decrease 48.7% 27.1%, decreasing amplitude parameter (an) 0.1 0.3 Ra=105.Keywords: CVFEMelectric fieldnanofluidnatural convectionthermal

Language: Английский

Citations

9