scholarly journals CONSTRUCTAL DESIGN OF A X-SHAPED CAVITY COOLED BY CONVECTION

2014 ◽  
Vol 13 (1) ◽  
pp. 54
Author(s):  
F. B. Link ◽  
L. A. O. Rocha ◽  
E. D. Dos Santos ◽  
L. A. Isoldi
Keyword(s):  
Heat Transfer ◽  
Solid Body ◽  
Convection Heat Transfer ◽  
Thermal Conditions ◽  
Optimal Distribution ◽  
Convection Heat ◽  
Cavity Volume ◽  
Constructal Design ◽  
And Performance ◽  
Optimal Configurations

This paper applies Constructal design to study the geometry of a X-shaped cavity that penetrates into a solid conductive wall. The objective is minimizing the dimensionless maximal excess of temperature between the solid body and the cavity. There is uniform heat generation on the solid body. The cavity surfaces are cooled by convection heat transfer while the solid body is subjected to adiabatic conditions on its outer surfaces. The total volume and the cavity volume are fixed, but the lengths and thickness of the X-shaped cavity can vary. The emerged optimal configurations and performance are reported. The effect of the area fraction φ which denotes the ratio between the cavity area and the total area of the geometry, and the ratio between the length and thickness of the branch cavity, H1/L1, on the dimensionless maximal excess of temperature is numerically investigated. The results show that the dimensionless maximal excess of temperature θmax,min decreases approximately 60% when the cavity fraction increases from φ = 0.05 to 0.25. The results also show that the X-shaped cavity performs approximately 45% better when compared to a C-shaped cavity under the same thermal conditions. The optimal X-shaped cavity is also in accordance with the optimal distribution of imperfections principle.

scholarly journals Constructal design of isothermal X-shaped cavities

2014 ◽  
Vol 18 (2) ◽  
pp. 349-356 ◽  
Author(s):  
G. Lorenzini ◽  
C. Biserni ◽  
F.B. Link ◽  
Dos Santos ◽  
L.A. Isoldi ◽  
...  
Keyword(s):  
Heat Generation ◽  
Solid Body ◽  
Outer Surface ◽  
Area Fraction ◽  
Cavity Volume ◽  
Constructal Design ◽  
Conducting Wall ◽  
And Performance ◽  
Optimal Configurations ◽  
Better Than

This paper applies Constructal design to study the geometry of a X-shaped cavity that penetrates into a solid conducting wall. The objective is to minimize the maximal dimensionless excess of temperature between the solid body and the cavity. There is uniform heat generation on the solid body. The total volume and the cavity volume are fixed, but the geometric lengths and thickness of the X-shaped cavity can vary. The cavity surfaces are isothermal while the solid body has adiabatic conditions on the outer surface. The emerged optimal configurations and performance are reported graphically. When compared to the Y- and C- and H-, the X-shaped cavity performs approximately 53% better than the Y-shaped cavity and 68% better than the C-shaped cavity for the area fraction ? = 0.05, while its performance is 22% inferior to the performance of the H-shaped cavity for the area fraction ? = 0.1. The results indicate that the increase of the complexity of the cavity geometry can facilitate the access of heat currents and improve the performance of the cavities.

Constructal Design of Cavities Inserted Into a Cylindrical Solid Body

2012 ◽  
Vol 134 (7) ◽  
Author(s):  
Giulio Lorenzini ◽  
Luiz Alberto Oliveira Rocha ◽  
Cesare Biserni ◽  
Elizaldo Domingues dos Santos ◽  
Liércio André Isoldi
Keyword(s):  
Aspect Ratio ◽  
Solid Body ◽  
Outer Surface ◽  
Hot Spots ◽  
Numerical Optimization ◽  
Internal Heat ◽  
Optimal Distribution ◽  
Constructal Design ◽  
Cylindrical Solid ◽  
And Performance

This paper considers the numerical optimization of the shape of cavities that intrude into a cylindrical solid body. The objective is to minimize the global thermal resistance between the solid body and the cavities. Internal heat generating is distributed uniformly throughout the solid body. The cavities are isothermal, while the solid body has adiabatic conditions on the outer surface. The total volume is fixed. The cavities are rectangular, with fixed volume and variable aspect ratio. The number of cavities of the conducting body, N, is a design parameter. The optimized geometry and performance are reported graphically as functions of the ratio between the volume of the cavities and the total volume, φ0, and N. The paper shows an example of the application of optimal distribution of imperfections principle. The results indicate that the optimal distribution of the hot spots is affected not only by the complexity of the configuration (larger N) but also by the area of cavities fraction φ0.

scholarly journals Analysis of Temperature Distribution And Performance of Motorcycle Engine Fins

2021 ◽  
Vol 9 (4) ◽  
pp. 361-366
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Convex Geometry ◽  
Convection Heat Transfer ◽  
Physical Models ◽  
Convection Heat ◽  
Air Velocity ◽  
Efficiency And Effectiveness ◽  
And Performance ◽  
Geometry Analysis

Air-cooled motorcycle engines release heat into the atmosphere through the process of forced convection, an important component for increasing the convection heat coefficient and the rate of heat transfer is fins. The rate of heat transfer depends on the geometry of the fin, the surface of the fin, the thickness of the fin, the distance between the fins, the temperature of the environment, and the air velocity. The research was conducted by varying the air velocity with the addition of holes in the geometry of convex fins. The main purpose of this study was to analyze the rate of heat transfer that occurs in the geometry of perforated fins by varying the air velocity. Physical models are designed using the Autodesk Inventor Professional 2020 application and simulated by Dynamics 2019 Autodesk Computational Fluid. The result of 4mm perforated convex geometry analysis is better than 2mm and 6mm perforated fins and non-perforated. Due to this, the rate of heat transfer has increased so that the coefficient of convection heat transfer increases and the decrease in the temperature of perforated fins is consistently higher than non-perforated fins, improving the efficiency and effectiveness of motorcycle fins so that the performance of motorcycle engines also increases indicated by the temperature distribution

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