Parametric Study of Entropy Generation in a Fluid with Internal Heat Generation between Two Rotating Cylinders Subjected to Convective Cooling at the Surface

Assad, Mamdouh El Haj; Öztop, Hakan F.

doi:10.5402/2012/941587

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Doing this would reduce pressure drop in fire-tube, which in turn minimizes entropy generation rate and hence irreversibility in the system. The result is in agreement with Assad and Oztop [24], where they reported that entropy generation rate decreases with increasing radius.…”

Section: Effects Of Fire-tube Diameter On Entropy Generationsupporting

confidence: 92%

Effects of Geometric Parameters on Entropy Generation in Fire-Tube Steam Boiler’s Heat Exchanger

Lasode

Oyekale²,

Ohijeagbon

et al. 2015

JESR

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This paper presents a parametric study on fire-tube steam boilers’ heat exchanging unit using Entropy Generation Minimization (EGM) technique. Mathematical equation that models entropy generation rate (Ṡgen), and entropy generation number (Ns), were formulated. The entropy generation number was related to the geometric features of the system. Solving the equations showed the effects of each geometric feature on both pressure drop and Ns. Correlation equation relating dimensionless fire-tube length to dimensionless tube diameter was also obtained. The obtained correlation equation is a tool to be incorporated into fire-tube steam boiler design, so as to account for entropy generation during design.

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Section: Effects Of Fire-tube Diameter On Entropy Generationsupporting

confidence: 92%

Effects of Geometric Parameters on Entropy Generation in Fire-Tube Steam Boiler’s Heat Exchanger

Lasode

Oyekale²,

Ohijeagbon

et al. 2015

JESR

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show abstract

“…Torabi and Aziz (2012) solved local and total entropy generation inside an asymmetrically cooled hollow cylinder. Local and total entropy generation in steady fluid flow with internal heat generation between two rotating cylinders were also investigated for different velocity ratios, Biot number, Brinkman number by Haj Assad and Oztop (2012). Authors found that as the Biot number increases and Brinkman number decreases, the internal heat generation leads to minimum total entropy generation rate.…”

Section: Introductionmentioning

confidence: 99%

Conjugate forced convection in a semi-cylindrical cavity with entropy generation

Çiçek

Baytaş

2019

HFF

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Purpose The aim of this paper is to investigate the conjugate forced convection in a semi-cylindrical cavity with air flow. Isotherms, streamlines, Bejan number and local entropy generation number are obtained for the semi-cylindrical cavity. Local Nusselt number, the temperature and the skin friction along the interface wall are calculated with different Reynolds numbers and geometric configurations. Design/methodology/approach The governing differential equations discretized by finite volume method are solved using SIMPLE algorithm. In this study, collocated grid, where all flow variables are stored at the same location, is used. Alternating direction implicit method and tri-diagonal matrix algorithm are used to solve linear algebraic equation systems. Findings The effects of Reynolds numbers, inlet and exit cross-section, the locations of exit section on fluid flow are also numerically investigated. It has been observed that since the secondary vortices developed near the exit cross-section negatively affect heat transfer, the temperature value is higher at this region. Better cooling inside cavity is provided in the cases of higher Re number, larger inlet and exit cross-section. The minimum average Nu numbers are computed for the location of L = 0.40 and the minimum total entropy generation numbers are founded in the case of L = 0.20. Originality/value This study provides insight into proper cooling and entropy generation inside the semi-cylindrical cavity for different conditions.

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“…He used the concept of entropy to study these irreversible changes. Later, this concept was used by different researchers to examine the inherent irreversibility effects in different geometrical configurations [3][4][5][6][7][8][9][10][11]. However, less attention is being paid to the study of entropy effects on boundary layer flow and heat transfer processes over a stretchable surface.…”

Section: Introductionmentioning

confidence: 99%

Irreversibility Analysis of MHD Flow over an Exponentially Stretching Sheet

Tufail

Ali

2013

Heat Trans. Asian Res.

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This laminar fluid study investigates the effects of a magnetic field on the entropy generation during fluid flow and heat transfer due to an exponentially stretching sheet. Using the suitable transformations we have obtained the analytical solutions for momentum and energy equation in terms of Kummer's function. The velocity and temperature profiles are obtained for various physical parameters which are utilized to find the entropy generation number N s and the Bejan number Be. The effects of various parameters on entropy production number and the Bejan number are studied through graphs using velocity and temperature profiles.

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Parametric Study of Entropy Generation in a Fluid with Internal Heat Generation between Two Rotating Cylinders Subjected to Convective Cooling at the Surface

Cited by 8 publications

References 17 publications

Effects of Geometric Parameters on Entropy Generation in Fire-Tube Steam Boiler’s Heat Exchanger

Effects of Geometric Parameters on Entropy Generation in Fire-Tube Steam Boiler’s Heat Exchanger

Conjugate forced convection in a semi-cylindrical cavity with entropy generation

Irreversibility Analysis of MHD Flow over an Exponentially Stretching Sheet

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