Unsteady evaporation and entropy generation in a Couette flow

Sakly, A.; Mazgar, Akram; Farhat, Habib; Nejma, Fayçal Ben

doi:10.1177/1687814017692782

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…Recently, the analysis of irreversibility of cylindrical annulus systems through the evaluation of the entropy generation was carried out numerically and experimentally. [29][30][31][32][33][34][35][36] In particular, Sakly et al 35 focused on the effect of geometric and thermodynamic parameters on the entropy generation for the case of unsteady evaporation. They showed that using higher initial temperatures leads to a significant entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Improved Energy Efficiency of Mixed Convection Heating Process in Eccentric Annulus

Abdelmlek

Fayçal

2021

Advances in Mechanical Engineering

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This paper deals with a numerical study of mixed convection heat transfer in horizontal eccentric annulus. The inner cylinder is supposed hot and rotating, however the outer one is kept cold and motionless. The numerical problem was solved using COMSOL Multiphysics® which is based on finite element method. The resolution of the partial differential equations was conducted through an implicit scheme with the use of the damped Newton’s method. The present numerical analysis concerns the effect of eccentricity, rotation speed and Rayleigh number on the flow patterns, heat transfer rate, and energy efficiency of the process. It was found that the heat transfer rate increases with the increase of Rayleigh number. In addition, the heat transfer rate drops with the increase of rotation speed. Finally, we have demonstrated that maximum energy efficiency is achieved not only with higher Rayleigh number but also it is maximum with small eccentricity.

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Section: Introductionmentioning

confidence: 99%

Improved Energy Efficiency of Mixed Convection Heating Process in Eccentric Annulus

Abdelmlek

Fayçal

2021

Advances in Mechanical Engineering

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“…In fact, to achieve better resource efficiency, the analysis of entropy generation needs to be carried out for such systems. Therefore, it is necessary to reduce the entropy generation rate for the purpose of increasing the productivity of thermal systems (Jarray et al , 2017; Sakly et al , 2017; Hajji et al , 2018; Gireesha and Sindhu, 2019; Gireesha and Roja, 2020; Sakly and Ben Nejma, 2020; Hajizadeh et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

Interaction of mixed convection with non-gray gas radiation in a partially heated horizontal pipe: entropy generation analysis

Mazgar

Jarray

Hajji

et al. 2021

HFF

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Purpose This paper aims to numerically analyze the effect of non-gray gas radiation on mixed convection in a horizontal circular duct with isothermal partial heating from the sidewall. The influence of heater location on heat transfer, fluid flow and entropy generation is given and discussed in this study. Design/methodology/approach The numerical computation of heat transfer and fluid flow has been developed by the commercial finite element software COMSOL Multiphysics. Radiation code is developed based on the T10 Ray-Tracing method, and the radiative properties of the medium are computed based on the statistical narrow band correlated-k model. Findings The obtained results depicted that the radiation considerably contributes to the temperature homogenization of the gas. The findings highlight the impact of the heater location on swirling flow. It is also shown that the laterally heating process provides better energy efficiency than heating from the top of the enclosure. Originality/value This study is performed to improve heat transfer and to minimize entropy generation. Therefore, it is conceivable to improve the model design of industrial applications.

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“…The purpose of this study is to investigate the generation of entropy in the turbulent flow around NACA 0012 airfoil. In the past two decades, a lot of researches has been done in the field of entropy generation, but most of them, such as the researches of Wang and Chi (2000), Haddad et al (2004), Ko and Ting (2006), Li and Kleinstreuer (2010), Wang et al (2016), Bejan (2016), Afridi et al (2017), Aghaei et al (2018), Hayat et al (2018), Soomro et al (2017), Hajji et al (2016), Mahdy (2018), Ozkol et al (2007), Gul et al (2018) and Sakly et al (2017), has been limited to the laminar flow. In similar research by Li et al (2006), entropy generation has been studied only at zero degrees angle of attack and laminar flow.…”

Section: Introductionmentioning

confidence: 99%

Investigating the entropy generation around an airfoil in turbulent flow

Saffarian

Jamaati

Mohammadi

et al. 2020

AEAT

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Purpose This study aims to evaluate the amount of entropy generation around the NACA 0012 airfoil. This study takes place in four angles of attack of 0°, 5°, 10° and 16° and turbulent regime. Also, the variation in the amount of generated entropy by the changes in temperature and Mach number is investigated. Design/methodology/approach The governing equations are solved using computational fluid dynamics techniques. The continuity, momentum and energy equations and the equations of the SST k-ω turbulence model are solved. The entropy generation at different angles of attack is calculated and compared. The effect of various parameters in the generation of entropy is presented. Findings Results show that the major part of the entropy generation is at the tip of the airfoil. Also, increasing the angle of attack will increase the entropy generation. Also, results show that with increasing the temperature of air colliding with the airfoil, the production of entropy decreases. Originality/value Entropy generation is investigated in the NACA 0012 airfoil at various angles of attack and turbulent flow using the SST turbulence model. Also, the effects of temperature and Mach number on the entropy generation are investigated.

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Unsteady evaporation and entropy generation in a Couette flow

Cited by 6 publications

References 30 publications

Improved Energy Efficiency of Mixed Convection Heating Process in Eccentric Annulus

Improved Energy Efficiency of Mixed Convection Heating Process in Eccentric Annulus

Interaction of mixed convection with non-gray gas radiation in a partially heated horizontal pipe: entropy generation analysis

Investigating the entropy generation around an airfoil in turbulent flow

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