Natural Convection Heat Transfer Enhancement of Circular Obstacle within Square Enclosure

2021 ◽  
Author(s):  
Shaik Subhani ◽  
Rajendran Senthil kumar
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Transfer Enhancement ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Transfer Enhancement ◽  
Square Enclosure

Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

2020 ◽  
Vol 28 (3) ◽  
pp. 643-659 ◽  
Author(s):  
Milad Gholami ◽  
Mohammad Reza Nazari ◽  
Mohammad Hossien Talebi ◽  
Farzad Pourfattah ◽  
Omid Ali Akbari ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Transfer Enhancement ◽  
Channel Wall ◽  
Convection Heat Transfer ◽  
Vertical Channel ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Transfer Enhancement

Convective heat transfer enhancement: effect of multi-frequency heating

2019 ◽  
Vol 29 (10) ◽  
pp. 3822-3856 ◽  
Author(s):  
Nirmal Kumar Manna ◽  
Nirmalendu Biswas ◽  
Pallab Sinha Mahapatra
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Transfer Enhancement ◽  
Convection Heat Transfer ◽  
Enhancement Effect ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Transfer Enhancement ◽  
Content Type ◽  
Frequency Heating

Purpose This study aims to enhance natural convection heat transfer for a porous thermal cavity. Multi-frequency sinusoidal heating is applied at the bottom of a porous square cavity, considering top wall adiabatic and cooling through the sidewalls. The different frequencies, amplitudes and phase angles of sinusoidal heating are investigated to understand their major impacts on the heat transfer characteristics. Design/methodology/approach The finite volume method is used to solve the governing equations in a two-dimensional cavity, considering incompressible laminar flow, Boussinesq approximation and Brinkman–Forchheimer–Darcy model. The mean-temperature constraint is applied for enhancement analysis. Findings The multi-frequency heating can markedly enhance natural convection heat transfer even in the presence of porous medium (enhancement up to ∼74 per cent). Only the positive phase angle offers heat transfer enhancement consistently in all frequencies (studied). Research limitations/implications The present research idea can usefully be extended to other multi-physical areas (nanofluids, magneto-hydrodynamics, etc.). Practical implications The findings are useful for devices working on natural convection. Originality/value The enhancement using multi-frequency heating is estimated under different parametric conditions. The effect of different frequencies of sinusoidal heating, along with the uniform heating, is collectively discussed from the fundamental point of view using the average and local Nusselt number, thermal and hydrodynamic boundary layers and heatlines.

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