Entropy Generation in Boundary Layer Flow of a Micro Polar Fluid Over a Stretching Sheet Embedded in a Highly Absorbing Medium

Jamalabadi, Mohammad Yaghoub Abdollahzadeh

doi:10.5098/hmt.6.7

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…A comprehensive review of entropy generation in natural convection for various enclosure shapes is done by Biswal and Basak [13]. Entropy generation and irreversibility of various fluid types, such as non-Newtonian [14], nano-fluid [15], micro polar fluid [16], Williamson fluid [17], power law fluid [18], etc., is done throughout the literature. The study of entropy generation is a base for entropy generation minimization (EGM) to design a system.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Thermal Radiative Heating of Horizontal Thin Plates Using the Entropy Generation Minimization Method

2017

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Thermal radiant heating through distinct heat sources is of interest for the thermal loading of thin objects as it is used in residential applications, furnaces, and insulator designs. In this paper, an optimal design for a thermal radiant system by discrete suspended heat sources is analyzed in a side open cavity used for heating the top plate, while the bottom plate is kept at a constant temperature, using the entropy generation minimization method. To avoid pressure fluctuations, the semi-implicit method for pressure linked equations method is used, which solves the continuity, Navier-Stokes, fluid energy, and surface energy equations simultaneously. The system is optimized based on the characteristic length of discrete heat sources, height of discrete heat sources from the bottom plate, the distance between discrete heat sources, the number of discrete heat sources, and the aspect ratio of the cavity that finds the optimal location of heating elements. In addition to the geometrical parameters, the effects of the thermal loading parameters on the optimal position are investigated.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of Thermal Radiative Heating of Horizontal Thin Plates Using the Entropy Generation Minimization Method

2017

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“…Consequently, local volumetric entropy production may occur as a result of fluid friction and heat transfer in the direction of finite temperature gradients. Following Jamalabadi [50], the volumetric rate of entropy generation is given by:…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Magnetic Field Effects on the Heat Transfer and Entropy Generation Aspects of a Power Law Fluid over an Axisymmetric Stretching Plate Structure

Hooshmand

Gatabi

Bagheri

et al. 2017

Entropy

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Numerical investigation of the effects of magnetic field strength, thermal radiation, Joule heating, and viscous heating on a forced convective flow of a non-Newtonian, incompressible power law fluid in an axisymmetric stretching sheet with variable temperature wall is accomplished. The power law shear thinning viscosity-shear rate model for the anisotropic solutions and the Rosseland approximation for the thermal radiation through a highly absorbing medium are considered. The temperature dependent heat sources, Joule heating, and viscous heating are considered as the source terms in the energy balance. The non-dimensional boundary layer equations are solved numerically in terms of similarity variable. A parameter study on the Nusselt number, viscous components of entropy generation, and thermal components of entropy generation in fluid is performed as a function of thermal radiation parameter (0 to 2), Brinkman number (0 to 10), Prandtl number (0 to 10), Hartmann number (0 to 1), power law index (0 to 1), and heat source coefficient (0 to 0.1).

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Thermal radiation effects on creep behavior of the turbine blade

Jamalabadi

2016

Multidiscipline Modeling in Materials and Structures

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Purpose – The purpose of this paper is to find the time dependent thermal creep stress relaxation of a turbine blade and to investigate the effect thermal radiation of the adjacent turbine blades on the temperature distribution of turbine blade and creep relaxation. Design/methodology/approach – For this analysis, the creep flow behavior of Moly Ascoloy in operational temperature of gas turbine in full scale geometry is studied for various thermal radiation properties. The commercial software is used to pursue a coupled fields analysis for turbine blades in view of the structural force, materials kinematic hardening, and steady-state temperature field. Findings – During steady-state operation, the thermal stress was found to be decreasing, whereas by considering the thermal radiation this rate was noticed to increase slightly. Also by increase of the distance between stator blades the thermal radiation effect is diminished. Finally, by decrease of the blade distance the failure probability and creep plastic deformation decrease. Research limitations/implications – This paper describes the effect of thermal radiation in thermal-structural analysis of the gas turbine stator blade made of the super-alloy M-152. Practical implications – Blade failures in gas turbine engines often lead to loss of all downstream stages and can have a dramatic effect on the availability of the turbine engines. There are many components in a gas turbine engine, but its performance is highly profound to only a few. The majority of these are hotter end rotating components. Social implications – Three-dimensional finite element thermal and stress analyses of the blade were carried out for the steady-state full-load operation. Originality/value – In the previous works the thermal radiation effects on creep behavior of the turbine blade have not performed.

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Entropy Generation in Boundary Layer Flow of a Micro Polar Fluid Over a Stretching Sheet Embedded in a Highly Absorbing Medium

Abstract: ABSTRACT

Cited by 6 publications

References 40 publications

Optimal Design of Thermal Radiative Heating of Horizontal Thin Plates Using the Entropy Generation Minimization Method

Optimal Design of Thermal Radiative Heating of Horizontal Thin Plates Using the Entropy Generation Minimization Method

Numerical Study of the Magnetic Field Effects on the Heat Transfer and Entropy Generation Aspects of a Power Law Fluid over an Axisymmetric Stretching Plate Structure

Thermal radiation effects on creep behavior of the turbine blade

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