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

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
Exploration of heat transfer and entropy generation in an irregular wall cavity filled with Al 2 O 3 -water nanofluid DOI
Ganesh Sahadeo Meshram, Gloria Biswal

Numerical Heat Transfer Part A Applications, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 22

Published: July 1, 2024

This study investigates 2-D natural convection heat transfer within an irregular wall cavity filled with nanofluid, employing a computational approach. The rough profile of the surface is generated using Weierstrass-Mandelbrot (W-M) function, and various parameters such as Rayleigh number (103≤Ra≤106), Knudsen (0≤Kn≤1.5), solid volume fraction (0≤ϕ≤0.15), amplitude (0≤A1≤0.1) are varied. nanofluid consists water base fluid aluminum oxide (Al2O3) nanoparticles. Heat characteristics analyzed Nusselt (Nu), while entropy generation quantified to optimize thermal system efficiency. Grid sensitivity analysis validation against existing literature conducted ensure accuracy numerical methodology. Notably, demonstrates that increasing slip velocity at enhances cavity, leading substantial increase in Nu. At Ra = 106, Nu increases by 53.52% when Kn changes from 0 1. Furthermore, highlights significant influence nanoparticle on Nu, showing increases, also indicating improved convective performance. for 0.1 roughly 2.5 times higher compared smooth-walled 106. Increased irregularity enhanced turbulence intensity mixing, stronger currents. novelty this lies examining shaped cavities wall-slip conditions, which common practical applications solar collectors, microelectronic devices, energy storage units, industrial furnaces, etc. offers valuable insights into behavior enclosures nanofluids, will facilitate optimization systems minimize losses.

Language: Английский

Citations

1
Turbulent natural convection inside inclined enclosures: Effects of adiabatic and heat-conducting inserts DOI
J.A.C. de Medeiros, Marcus Vinícius Canhoto Alves, P. S. B. Zdanski

et al.

Numerical Heat Transfer Part A Applications, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 16

Published: May 2, 2024

Natural convection phenomena are found in many engineering applications, ranging from building and refrigeration design to nuclear reactors. Such importance has prompted both experimental numerical studies aiming at enhancing heat transfer characteristics. Turbulent natural closed cavities, apparently simple, is a stepstone such problems, which require mathematical tools capable of providing accurate results. This work inserted within this framework, influences insert size type (adiabatic/heat-conducting), cavity inclination angle assessed for Rayleigh numbers 107≤Ra≤109. The study shows that the mostly detrimental owing restriction recirculation, irrespective angle. An operation envelope global Nusselt number all angles, sizes types, was also determined.

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