Constructal H-shaped cavities according to Bejan’s theory

Biserni, Cesare; Rocha, Luíz Alberto Oliveira; Stanescu, George; Lorenzini, Enrico

doi:10.1016/j.ijheatmasstransfer.2006.11.006

Cited by 119 publications

(53 citation statements)

References 10 publications

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“…Bejan, 2000;Bejan and Lorente, 2004;Reis, 2006;Bejan and Lorente, 2008;and Cetkin et al, 2010) and heat transfer (e.g. Bejan and Almogbel, 2000;Biserni et al, 2007;Xie et al, 2010;Lorenzini et al, 2014a;Lorenzini et al, 2014b;and Rodrigues et al, 2015) areas.…”

Section: Latin American Journal Of Solids and Structures 13 (2016) 19mentioning

confidence: 99%

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Helbig

Silva

Real

et al. 2016

Lat. Am. j. solids struct.

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Perforated steel thin plates are commonly used in structural engineering. Due to their geometric characteristics, these panels can suffer the undesired buckling phenomenon. In this context, the present work associates the computational modeling and the constructal design method to evaluate the influence of the geometric configuration in the plate buckling behavior, using the exhaustive search method to determine which geometries conduct to superior mechanical behavior. To do so, numerical models are employed to solve elastic and elasto-plastic buckling of plates having a centered perforation. Different hole types (longitudinal oblong, transversal oblong, elliptical, rectangular, diamond, longitudinal hexagonal, or transversal hexagonal) with different shapes (variation of characteristics dimensions of each hole type) are analyzed. Limit curves to avoid buckling were obtained, as well as the definition of the geometries that can improve up to 107% the plate performance.

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Section: Latin American Journal Of Solids and Structures 13 (2016) 19mentioning

confidence: 99%

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Helbig

Silva

Real

et al. 2016

Lat. Am. j. solids struct.

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“…A partir dessa constatação, diversos estudos vêm sendo realizados avaliando diferentes formas geométricas para cavidade de dissipação de calor com Design Construtal a fim de encontrar arranjos ótimos para aumentar a troca térmica dentro das restrições impostas. Podemos citar os trabalhos em cavidade em forma de 'C' [20,21], 'T' [22], 'H' [23] e até mesmo formas mistas como 'T-Y' [24].…”

Section: Introductionunclassified

Otimização construtal de uma cavidade multi-bifurcada para dissipação de calor

2017

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O propósito do trabalho é analisar a influência dos parâmetros geométricos sobre a dissipação de calor de um perfil bidimensional com uma cavidade multi-bifurcada mantendo a área da cavidade constante. A simulação numérica foi realizada através da solução da equação da difusão do calor com MEF. Foi calculado o campo de distribuição de temperaturas no regime permanente e com geração de calor interna fixa e foi assumido que a transferência de calor no sólido ocorreu por condução. A geometria da cavidade foi gerada por um sistema de funções iteradas e um algoritmo foi implementado para testar diferentes ângulos de bifurcação, tamanho de cada braço de ramificação e número de iterações para geração da geometria. Entre as cavidades testadas foi possível determinar uma geometria ótima que serve de recomendação teórica para construção de possíveis perfis para troca de calor.Palavras-chave: MEF, dissipação de calor, design construtal.The purpose of this work is to analyze the influence of geometric parameters on the heat dissipation of a two-dimensional profile with a multi-bifurcated cavity keeping the cavity area constant. The numerical simulation was performed through the solution of the heat diffusion equation with MEF. The temperature distribution field was calculated in the steady state and with fixed internal heat generation and it was assumed that heat transfer to the solid occurred by conduction. The cavity geometry was generated by a system of iterated functions and an algorithm was implemented to test different bifurcation angles, size of each branching arm and number of iterations for geometry generation. Among the wells tested, it was possible to determine an optimum geometry that serves as a theoretical recommendation for the construction of possible profiles for heat exchange.Keywords: FEM, heat dissipation, constructal design. INTRODUÇÃOFractais tem sido usados em diversas áreas de engenharia e o potencial dessa teoria começa a ser importante em diversas aplicações industriais reais [1]. O uso da teoria dos fractais abrange aplicações na área de física [2,3], engenharia química [4,5], finanças [6,5], tráfego de internet [7], processamento de imagens [8,9], dinâmica dos fluidos [10,11], ciência ambiental [12,13], análise de superfícies [14] dentre outros. O motivo dessa gama de aplicações da teoria fractal se deve particularmente a sua característica de descrever a auto-similaridade em diferentes escalas que é uma aproximação do que ocorre na natureza [15,16]. Com uma formulação mais prática, existe também a Teoria Construtal que procura explicar deterministicamente o surgimento de formas na natureza a partir da ideia de um sistema de fluxo que altera sua forma para facilitar o acesso das correntes que fluem através dele. Dentro da Teoria Construtal é definido por Adrian Bejan o método Design Construtal como o uso da Lei Construtal como uma ferramenta na procura de melhores configurações e também melhores estratégias para resolução de um determinado problema que depende de geometria [17].Um problema freque...

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“…Cooling of electronic chips/system, micro-electro-mechanical systems (MEMS), solar collectors, and heat exchangers are some of the many important applications that handle different cavity shapes. Biserani et al [33] used Bejan's constructal theory to optimize the geometry of H-shaped cavity that intrudes into a solid conducted wall. They optimized other cavities namely, C-shaped and T-shaped cavities and found that H-shaped is superior in thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field

Chamkha

Ismael

Kasaeipoor

et al. 2016

Entropy

134

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This paper investigates the entropy generation and natural convection inside a C-shaped cavity filled with CuO-water nanofluid and subjected to a uniform magnetic field. The Brownian motion effect is considered in predicting the nanofluid properties. The governing equations are solved using the finite volume method with the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm. The studied parameters are the Rayleigh number (1000 ď Ra ď 15,000), Hartman number (0 ď Ha ď 45), nanofluid volume fraction (0 ď φ ď 0.06), and the cavity aspect ratio (0.1 ď AR ď 0.7). The results have shown that the nanoparticles volume fraction enhances the natural convection but undesirably increases the entropy generation rate. It is also found that the applied magnetic field can suppress both the natural convection and the entropy generation rate, where for Ra = 1000 and φ = 0.04, the percentage reductions in total entropy generation decreases from 96.27% to 48.17% for Ha = 45 compared to zero magnetic field when the aspect ratio is increased from 0.1 to 0.7. The results of performance criterion have shown that the nanoparticles addition can be useful if a compromised magnetic field value represented by a Hartman number of 30 is applied.

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Constructal H-shaped cavities according to Bejan’s theory

Cited by 119 publications

References 10 publications

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Otimização construtal de uma cavidade multi-bifurcada para dissipação de calor

Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field

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