scholarly journals Numerical Analysis of Three-Dimensional Natural Convection in a Closed Rectangular Cavity Under Conditions of Radiant Heating and Conjugate Heat Exchange

2016 ◽  
Vol 91 ◽  
pp. 01027
Author(s):  
Alexander E. Nee
Keyword(s):  
Natural Convection ◽  
Heat Exchange ◽  
Numerical Analysis ◽  
Three Dimensional ◽  
Rectangular Cavity ◽  
Radiant Heating ◽  
Conjugate Heat Exchange

scholarly journals Numerical study of the turbulent natural convection of nanofluids in a partially heated cubic cavity

2021 ◽  
pp. 57-57
Author(s):  
Zakaria Lafdaili ◽  
Sakina El-Hamdani ◽  
Abdelaziz Bendou ◽  
Karim Limam ◽  
Bara El-Hafad
Keyword(s):  
Nusselt Number ◽  
Natural Convection ◽  
Heat Exchange ◽  
Metallic Nanoparticles ◽  
Volume Fraction ◽  
Numerical Study ◽  
Three Dimensional ◽  
Stability Characteristic ◽  
Horizontal Strip ◽  
Turbulent Natural Convection

In this work we study numerically the three-dimensional turbulent natural convection in a partially heated cubic cavity filled with water containing metallic nanoparticles, metallic oxides and others based on carbon.The objective is to study and compare the effect of the addition of nanoparticles studied in water and also the effect of the position of the heated partition on the heat exchange by turbulent natural convection in this type of geometry, which can significantly improve the design of heat exchange systems for better space optimization. For this we have treated numerically for different volume fractions the turbulent natural convection in the two cases where the cavity is heated respectively by a vertical and horizontal strip in the middle of one of the vertical walls. To take into account the effects of turbulence, we used the standard turbulence model ? - ?. The governing equations are discretized by the finite volume method using the power law scheme which offers a good stability characteristic in this type of flow. The results are presented in the form of isothermal lines and current lines. The variation of the mean Nusselt number is calculated for the two positions of the heated partition as a function of the volume fraction of the nanoparticles studied in water for different Rayleigh numbers.The results show that carbon-based nanoparticles intensify heat exchange by convection better and that the position of the heated partition significantly influences heat exchange by natural convection. In fact, an improvement in the average Nusselt number of more than 20% is observed for the case where the heated partition is horizontal.

Three-Dimensional Numerical Analysis for Convection of Air in a Bore Space of a Superconducting Magnet

2003 ◽  
Author(s):  
G. Tomita ◽  
M. Kaneda ◽  
T. Tagawa ◽  
H. Ozoe
Keyword(s):  
Magnetic Field ◽  
Heat Flux ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Strong Magnetic Field ◽  
Three Dimensional ◽  
Superconducting Magnet ◽  
Constant Heat Flux ◽  
Constant Heat ◽  
Magnetizing Force

Three-dimensional numerical computations were carried out for the natural convection of air in a horizontal cylindrical enclosure in a magnetic field, which is modeled for a bore space of a horizontal superconducting magnet. The enclosure was cooled from the circumferential sidewall at the constant heat flux and vertical end walls were thermally insulated. A strong magnetic field was considered by a one-turn electric coil with the concentric and twice diameter of the cylinder. Without a magnetic field, natural convection occurs along the circumferential sidewall. When a magnetic field was applied, magnetizing force induced the additional convection, that is, the cooled air at the circumferential wall was attracted to the location of a coil. Consequently, the temperature around the coil decreased extensively.

Numerical Analysis of Three-Dimensional Heat Exchange in Oblique Cutting

CIRP Annals ◽  
1985 ◽  
Vol 34 (1) ◽  
pp. 137-140 ◽  
Author(s):  
V.A. Ostafiev ◽  
A.N. Noshchenko
Keyword(s):  
Heat Exchange ◽  
Numerical Analysis ◽  
Three Dimensional ◽  
Oblique Cutting

Effect of Length Ratio on Heat Exchange Rate by a Triangular Heat Generating Conductive Body Inside an Enclosure

2018 ◽  
Vol 10 (5) ◽  
Author(s):  
Mohammad Ahmad ◽  
Harish Chandra Thakur
Keyword(s):  
Heat Exchange ◽  
Numerical Analysis ◽  
Simple Algorithm ◽  
Length Ratio ◽  
Convective Term ◽  
Square Enclosure ◽  
Numerical Investigations ◽  
Discrete Equations ◽  
Conjugate Heat Exchange ◽  
Triangular Block

This paper presents a numerical analysis of the conjugate heat exchange inside a square enclosure full of a copper-water nanofluid. The enclosure also contains a heat-generating solid triangular block (a source of heat) at the center. While the horizontal walls of the enclosure are viewed as adiabatic, its perpendicular walls are operated at a consistently low temperature. The second order upwind scheme is used for the convective term and SIMPLE algorithm, to lead the numerical analysis and solve the discrete equations using the commercial software FLUENT 15.0. The consequences of the numerical investigations are then used to clear up the effect of length-ratio and transfer of heat. As per observations, the expansion in the length-ratio influences the rate of heat transfer.

Three-Dimensional Numerical Analysis of Transient Natural Convection in Rectangular Enclosures

1979 ◽  
Vol 101 (1) ◽  
pp. 114-119 ◽  
Author(s):  
A. M. C. Chan ◽  
S. Banerjee
Keyword(s):  
Porous Media ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Turbulent Flows ◽  
Numerical Technique ◽  
Three Dimensional ◽  
Experimental Results ◽  
Primitive Form ◽  
Conservation Equations ◽  
Practical Utility

A simple numerical technique of considerable practical utility for the solution of transient multidimensional natural convection problems is described. It is based on the solution of the conservation equations in primitive form. The technique can be extended to calculation of natural convection problems in porous media and in turbulent flows where the eddy viscosities and conductivities can be predicted. It has been applied to the solution of several two and three-dimensional natural convection problems. The solutions compare well with the numerical and experimental results published by other investigators.

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