Comparing Two Numerical Methods in the Case of Aiding and Opposing Natural Double Diffusion in a Square Enclosure DOI
Bilal El hadoui, Mourad Kaddiri

Published: May 16, 2024

Natural convection is a central topic in fluid mechanics, attracting the interest of researchers for its value validation numerical methods and multiple applications engineering due to significant advantages over experimental approaches. double-diffusive particularly intriguing because diverse fields, where simultaneous variations temperature concentration generate buoyancy forces. In this paper, two are used study natural doublediffusive cavity containing binary mixture, subjected Neumann-type thermal solutal gradients. The results compared previous studies, highlighting impact initial conditions relevant parameters on flow intensity as well average Nusselt Sherwood numbers. Simulations showed that finite difference method outperformed volume terms mesh independence computational time, although not iterations. Additionally, opposite case presented multiplicity solutions requiring careful selection conditions. This work highlights importance understanding nuances modeling effectively convection.

Language: Английский

Numerical Investigations of Superconducting Material Cooling Using Buoyancy-Driven Heat Transport in Cryogenic Nanofluids DOI
Sukanta Nayak, Atul Bhattad, Kishore Singh Patel

et al.

Heat Transfer Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 16

Published: Jan. 20, 2025

Language: Английский

Citations

0
Numerical investigation on mixed convection with nanofluids in vertical channels with opposing moving plate DOI Open Access
Bernardo Buonomo, Oronzio Manca, Sergio Nardini

et al.

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2940(1), P. 012034 - 012034

Published: Jan. 1, 2025

Abstract A numerical investigation on 2-dimensional steady-state mixed convection in a vertical channel asymmetrically heated with water-alumina (Al 2 O 3 ) nanofluids is performed to evaluate the thermal and fluid dynamic behavior. The interest this problem related several technological applications such as nuclear reactors electronic components. Nanoparticles have diameter of 30 nm four different values concentration (from 0 6%). computational domain made up two lateral reservoirs, which simulate external ambient. bounded by parallel plates constant aspect ratio. One heat flux, while other considered adiabatic moving opposite direction buoyancy force. governing equations are numerically solved finite volume method means ANSYS-Fluent code. Four wall flux (with Ra =7×10 10 6 six velocities unheated plate Re =1 considered. Results presented terms velocity, temperature, pressure stream function. Finally, correlations for prediction average Nusselt number along presented.

Language: Английский

Citations

0
NUMERICAL INVESTIGATION ON EFFECT OF INCLINATION ANGLE ON NATURAL CONVECTION WITH NANOFLUIDS IN CHANNELS ASYMMETRICALLY HEATED DOI

Maria Barbato,

Bernardo Buonomo, Oronzio Manca

et al.

Proceeding of 5-6th Thermal and Fluids Engineering Conference (TFEC), Journal Year: 2025, Volume and Issue: unknown, P. 1285 - 1289

Published: Jan. 1, 2025

Language: Английский

Citations

0
Optimizing thermal management of convective heat transfer in a complex nanofluid-filled cavity using the lattice Boltzmann method DOI
Youness Ighris, Bilal El hadoui, Jamal Baliti

et al.

International Journal of Numerical Methods for Heat &amp Fluid Flow, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Purpose This study aims to optimize natural convective heat transfer in a complex cavity filled with Al 2 O 3 /water nanofluid. It compares theoretical and experimental nanofluid models, focusing on thermal conductivity viscosity. In addition, it explores the optimal configuration of rectangular heater, analyzing its aspect ratio, orientation position. Design/methodology/approach The lattice Boltzmann method was used simulate convection partially heated left wall, cooled right wall other walls are adiabatic. Simulations conducted for 15 heater configurations, varying Rayleigh numbers (10 ≤ Ra 10 6 ), compared (M I) II) results presented through isotherms, streamlines, velocity temperature profiles Nusselt numbers. Findings indicate that geometric design plays crucial role optimizing performance fluid dynamics. occurs when is horizontally oriented placed at cavity’s bottom, maximizing circulation. choice model significantly impacts balance between M I enhances minimal viscosity variation, while II shows increased sensitivity. Originality/value offers an in-depth analysis interaction design, models optimization cavity. contributes applications like electronic devices energy systems. comparison multiple configurations evaluation offer novel insights, reinforcing originality this research.

Language: Английский

Citations

0
Natural convection heat transfer enhancement of hybrid nanofluids in snowflake-inspired heat sink structures DOI
Rasul Mohebbi, Mohamed Bechir Ben Hamida, Yuan Ma

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

With the continuous growth of energy demand and increasing urgency environmental protection, enhancing conversion efficiency reducing consumption have become particularly important. Nanotechnology, especially nanofluids, has shown great potential in improving thermal conductivity heat transfer performance. This study investigates enhancement natural convection using multi-walled carbon nanotube-Fe3O4/water hybrid nanofluids different radiator structures through numerical simulations. The considers various geometries (circular snowflake-shaped), nanoparticle volume fractions (0, 0.001, 0.003), Rayleigh numbers (Ra = 103–106). results indicate that introduction nanoparticles enhances average Nusselt number by up to 13% at highest fraction compared base fluid. dense-branch snowflake-shaped (DB case) demonstrates superior performance, achieving a 23% higher than circular design high Ra number. Furthermore, as increases, convective is significantly enhanced. highlights combined influence geometric optimization provides quantitative insights for designing efficient management systems.

Language: Английский

Citations

0
Thermal management optimization of natural convection in a triangular chamber: Role of heating positions and ternary hybrid nanofluid DOI
Youness Ighris,

Mohsine Qaffou,

Jamal Baliti

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

In this paper, we used the multi-relaxation time lattice Boltzmann method to investigate natural convection in a triangular-shaped cavity filled with tri-hybrid nanofluid. The is partially heated by chip of fixed size (l=L/2), position which varies on left and bottom walls order find optimal positions. inclined side maintained at cool temperature, while other parts are adiabatic. A detailed analysis carried out impact four essential parameters optimization heat transfer: Rayleigh number, ranging between Ra = 103 106; partial heating position, showing six different configurations; fluid type, including pure water, nanofluid, hybrid nanofluid; finally, volume concentration nanoparticles for three values, ϕ 0%, 3%, 6%. Results presented form isotherms, streamlines, temperature velocity profiles, mean Nusselt number values. As results show, heater plays crucial role, influencing transfer significantly certain positions all values number. type has remarkable amplification large where buoyancy force becomes strong. Notably, use nanofluid shows clear improvement transfer. Furthermore, substantial increase thermal transmittance observed an increasing nanoparticle fraction. validation agree well both numerical experimental data published literature.

Language: Английский

Citations

3
Enhancement of Carbon Nanotubes/Kerosene Nanofluids on Mixed Convective Heat Transfer in Rectangular Enclosures DOI Creative Commons
Bilal El hadoui, Mourad Kaddiri

International Journal of Thermofluids, Journal Year: 2024, Volume and Issue: unknown, P. 100932 - 100932

Published: Oct. 1, 2024

Language: Английский

Citations

1
Numerical analysis of the aspect ratio effect on mixed convection in vertical channels asymmetrically heated with nanofluids with assisting and opposing moving plate DOI Open Access
Bernardo Buonomo, Oronzio Manca, Sergio Nardini

et al.

Journal of Physics Conference Series, Journal Year: 2024, Volume and Issue: 2893(1), P. 012090 - 012090

Published: Nov. 1, 2024

Abstract In this study, a numerical investigation on mixed convection in vertical channel with water-alumina (Al 2 O 3 ) nanofluids due to the interaction between buoyancy-driven flow and moving plate-induced one is performed. One of plates that bound heated by constant heat flux, while other, considered adiabatic, moves velocity direction buoyancy force or opposite direction, comparison two options. The nanofluid modelled using Single-Phase Model. thermophysical properties are assumed be temperature, fluid laminar incompressible. governing equations numerically solved finite volume method means ANSYS-FLUENT code. can have three different aspect ratios, ranging 5 20, external reservoirs allow simulating ambient assigning zero temperature at boundary reservoirs. impacts values ratio channel, wall plate velocity, concentration nanoparticles investigated. Results terms provided. Finally, correlations for predicting average Nusselt number along proposed.

Language: Английский

Citations

1
Computational study of aspect ratio and undulation effect on natural convection in an inverted T-shaped porous enclosure DOI
Sumant Kumar, S. V. S. S. N. V. G. Krishna Murthy, Brajesh Kumar

et al.

Numerical Heat Transfer Part A Applications, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 24

Published: May 7, 2024

This numerical study aims to enhance the convective thermal and fluid flow characteristics in an inverted T-shaped porous enclosure saturated with a water-based special fluid. Moreover, Darcy-extended Brinkman-Forchheimer-based mathematical model is numerically simulated penalty finite element approach analyze influence of aspect ratio undulation effect on developed model. Firstly, various ratios (Ar=0.25,0.50,and 0.75) are at varying range Rayleigh number (Ra), which reveals that increasing reinforce heat phenomena. it confirms most pertinent (Ar = 0.50) get superior results reinforcing among other ratios. Furthermore, optimal further fixed explore parametric influences, including (Ra=103−106), porosity value (ϵ=0.1−0.9), Darcy (Da=10−5−10−2), parameters such wave (na=5,9,15) amplitude wavy surface (a=0,0.050,0.125,0.250). The reveal augmenting Ra, Da, ϵ reinforces transport characteristics. combined factors (na,a) also reported, indicating decreasing na magnitude strengthen natural convection process. It analyzed combination (na=5,a=0.25) 16.15% transfer enhancement. Additionally, maximum enhancements 32.55%, 6.63%, 41.47% Num reported while comparing between 5 15 for ϵ. Similarly, 17.87%, 16.10%, 37.77% when 0.05 0.25 research contributes valuable insights into improving processes real-world applications, especially industrial solar power collectors, exchangers, storage industries utilize configuration.

Language: Английский

Citations

0
Comparing Two Numerical Methods in the Case of Aiding and Opposing Natural Double Diffusion in a Square Enclosure DOI
Bilal El hadoui, Mourad Kaddiri

Published: May 16, 2024

Natural convection is a central topic in fluid mechanics, attracting the interest of researchers for its value validation numerical methods and multiple applications engineering due to significant advantages over experimental approaches. double-diffusive particularly intriguing because diverse fields, where simultaneous variations temperature concentration generate buoyancy forces. In this paper, two are used study natural doublediffusive cavity containing binary mixture, subjected Neumann-type thermal solutal gradients. The results compared previous studies, highlighting impact initial conditions relevant parameters on flow intensity as well average Nusselt Sherwood numbers. Simulations showed that finite difference method outperformed volume terms mesh independence computational time, although not iterations. Additionally, opposite case presented multiplicity solutions requiring careful selection conditions. This work highlights importance understanding nuances modeling effectively convection.

Language: Английский

Citations

0