Entropy analysis for non-linear viscoelastic fluid in concentric rotating cylinders

Mirzazadeh, Mahmoud; Shafaei, Ashraf; Rashidi, Fariborz

doi:10.1016/j.ijthermalsci.2007.11.002

Cited by 32 publications

(13 citation statements)

References 25 publications

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“…In order to obtain a suitable Br value, and only for this case, the dynamic viscosity µ was artificially changed to 0.01831 Pa · s. Figure 4 shows the numerically calculated dimensionless entropy generation profiles (NṠ ,Gen,T ) compared to the analytical solutions from Mirzazadeh [13] for a varying ratio Br/Ω. The dimensionless entropy generation terms are calculated as:…”

Section: Internal Flow: Two Concentric Rotating Cylindersmentioning

confidence: 99%

Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration

Eger

Bol

Thévenin

et al. 2015

Entropy

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Abstract:The present paper analyzes numerically the entropy generation induced by forced convection in a canonical configuration. The configuration itself includes two well known fluid dynamic problems: (1) an external flow (flow around a cylinder, Kármán flow); and (2) an internal flow (flow between two concentric rotating cylinders, Couette flow). In many daily engineering issues (e.g., cooling of electric machines), a combination of these problems occurs and has to be investigated. Using the canonical configuration, the fields of entropy generation are analyzed in this work for a constant wall heat flux but varying two key parameters (Reynolds numbers Re ∞ and Re 0 ). The entropy generation due to conduction shows an absolute minimum around Re 0 = 10, 000. The same minima can be found by a detailed analysis of the temperature profile. Thus, entropy generation seems to be a suitable indicator for optimizing heat exchange processes and delivers a large amount of information concerning fluid and heat transport.

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Section: Internal Flow: Two Concentric Rotating Cylindersmentioning

confidence: 99%

Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration

Eger

Bol

Thévenin

et al. 2015

Entropy

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“…An experimental study of heating fluid between two concentrating cylinders with cavities with rotating inner cylinder and outer cylinder at rest has been conducted [10]. Entropy generation for nonlinear viscoelastic fluid in concentric rotating cylinders 2 ISRN Chemical Engineering subjected to different boundary conditions has been investigated [11] in which the results show that entropy generation number increases with increasing Brinkman number. The problem of natural convection of gas in an annulus between two horizontal coaxial cylinders at rest with uniform internal heat generation and different temperatures at the boundaries has been introduced and investigated numerically [12].…”

Section: Introductionmentioning

confidence: 99%

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

Assad

Öztop

2012

ISRN Chemical Engineering

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Entropy generation analysis of a steady fluid flow with internal heat generation between two rotating cylinders was presented. The surface of the inner cylinder was kept at constant temperature while the surface of the outer cylinder was exposed to convection cooling. Analytical expressions for velocity and temperature distributions within the fluid were obtained. The effects of velocity ratio, Biot number, Brinkman number and other dimensionless parameters on the temperature distribution and local and total entropy generation rates were investigated and the results were presented graphically.

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“…One more analytical solution for entropy generation on viscoelastic fluid flow through a stretching sheet with an inclined magnetic field and non-linear thermal radiation impact was studied by Abdul Hakeem et al [2]. The impact of entropy generation on viscoelastic fluid through a rotating cylinder was examined by Mirzazadeh et al [3]. They obtained that the elasticity parameter minimized the entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Elastic deformation and inclined magnetic field on entropy generation for Walter’s liquid B fluid over a stretching sheet

Ragavan

Munirathinam

Govindaraju³

et al. 2019

J. Appl. Math. Comput. Mech.

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An analytical solution is presented for entropy generation on MHD Walter's liquid B fluid over a stretching sheet with elastic deformation. The governing expressions of PDEs are converted into ODEs by suitable transformation which is solved by a hypergeometric function. Plots for velocity, heat transfer, entropy generation and a Bejan number are examined and their behavior is deliberated for several physical parameters. It is noticed that the entropy generation is minimized for an Eckert number and enhanced for an elastic deformation parameter. Moreover, these two parameters on the Bejan number profile have reverse effects.

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Entropy analysis for non-linear viscoelastic fluid in concentric rotating cylinders

Cited by 32 publications

References 25 publications

Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration

Preliminary Numerical Investigations of Entropy Generation in Electric Machines Based on a Canonical Configuration

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

Elastic deformation and inclined magnetic field on entropy generation for Walter’s liquid B fluid over a stretching sheet

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