NUMERICAL STUDY OF NATURAL CONVECTION IN ENCLOSED VOLUME

2016 ◽  
Vol 6 (3) ◽  
pp. 146-150 ◽  
Author(s):  
Darya O. KORTYAEVA ◽  
Maxim N. NIKITIN
Keyword(s):  
Comparative Analysis ◽  
Natural Convection ◽  
Numerical Study ◽  
Central Section ◽  
Convective Mixing ◽  
Heated Air ◽  
Sst Turbulence Model ◽  
Upward Velocity ◽  
Stationary Formulation ◽  
Coupling Algorithm

A numerical study of natural convection was conducted with Code Saturne soft ware package. A numerical model based on combined k-ω SST turbulence model was developed. The results of simulation of natural convection in enclosed volume of air were obtained in two variants of boundary conditions specification: by heat flux and by heat transfer coefficient. The problem was solved in a non-stationary formulation using a pressure-velocity coupling algorithm PISO. This simulation model adequacy is evaluated. Experimental data on the temperature profile in the central section is used as a benchmark criteria. Assumptions about the destructive factors reducing the accuracy of the solution, are partly supported by the results of comparative analysis of the intensity of convective mixing. Assumptions partially confirmed by the results of comparative analysis of the intensity of convective mixing, performed on the basis of upward velocity profiles for the heated air.

COMPARATIVE ANALYSIS OF NUMERICAL SIMULATION OF NATURAL CONVECTION

2016 ◽  
Vol 6 (2) ◽  
pp. 124-128
Author(s):  
Maksim N. NIKITIN
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Natural Convection ◽  
Turbulence Models ◽  
Computational Grid ◽  
Closed Volume ◽  
Central Section ◽  
Ansys Fluent ◽  
Wall Functions ◽  
Convective Mixing

It is studied numerical simulation conditions using software ANSYS Fluent, Code Saturne and OpenFOAM using the example of the problem of natural convection of air in the closed volume in the presence of the heating element. A comparative analysis of packets on the basis of three turbulence models (k-, k- SST и LES) is given, an assessment of the adequacy of the results is shown. As a benchmark experimental data on the temperature profi le in the central section are used. Assumptions about the destructive factors that reduce the accuracy of the decision, partly confi rms the results of a comparative analysis of the convective mixing intensity, are made. Combined turbulence model k- SST is used to determine the eff ectiveness of the implementation of the wall functions in packages Code Saturne and OpenFOAM to the computational grid with a variable dimensionless distance in the range of 1 y + 5 and 10 y + 50.

EXPERIMENTAL AND NUMERICAL STUDY OF THREE-DIMENSIONAL NATURAL CONVECTION AND FREEZING IN WATER

1994 ◽  
Author(s):  
C. Abegg ◽  
Graham de Vahl Davis ◽  
W.J. Hiller ◽  
St. Koch ◽  
Tomasz A. Kowalewski ◽  
...  
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Three Dimensional

EXPERIMENTAL AND NUMERICAL STUDY OF NATURAL CONVECTION AROUND A SQUARE DISK

Equipment ◽  
2006 ◽  
Author(s):  
A. Willockx ◽  
C. T'Joen ◽  
H. Steeman ◽  
M. De Paepe
Keyword(s):  
Natural Convection ◽  
Numerical Study

NUMERICAL STUDY OF NATURAL CONVECTION IN A SPHERICAL POROUS ANNULUS

2016 ◽  
Vol 19 (3) ◽  
pp. 277-286 ◽  
Author(s):  
Sangita ◽  
Mrityunjay K. Sinha ◽  
R. V. Sharma
Keyword(s):  
Natural Convection ◽  
Numerical Study

An Investigation of the Effect of interrupted fin arrangements on the Thermal Performance of a Heat Sink under a Free Convection Condition

2019 ◽  
Vol 7 (1) ◽  
pp. 43-53
Author(s):  
Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins was investigated numerically in a natural convection field, with steady-state heat transfer. A numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of the fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins. The number of fins used on the surface is eight. In this study, the heat input was used as follows: 20, 40, 60, 80, 100, and 120 watts. This study focused on interrupted rectangular fins with a different arrangement and angle of the fins. Results show that the addition of interruption in fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate as an equation can be obtained.

Sign in / Sign up

Export Citation Format

Share Document