Irreversibilities in various duct geometries with constant wall heat flux and laminar flow

Şahin, Ahmet Z.

doi:10.1016/s0360-5442(98)00010-3

Cited by 99 publications

(52 citation statements)

References 4 publications

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“…9 and 10. The dimensionless entropy generation is higher for the square cross section compared to the 19 rectangular counterparts and this is similar to what reported by previous researchers [17], [32].…”

Section: Resultssupporting

confidence: 91%

Heat transfer and entropy generation optimization of forced convection in porous-saturated ducts of rectangular cross-section

Hooman

Gurgenci

Merrikh

2007

International Journal of Heat and Mass Transfer

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We investigate analytically the First and the Second Law (of Thermodynamics) characteristics of fully developed forced convection inside a porous-saturated duct of rectangular cross-section. The Darcy-Brinkman flow model is employed. Three different types of thermal boundary conditions are examined. Expressions are presented for the Nusselt number, the Bejan number, and the dimensionless entropy generation rate in terms of the system parameters. The conclusion of this analytical study will make it possible to compare and evaluate alternative rectangular duct design options in terms of heat transfer, pressure drop, and entropy generation.

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Section: Resultssupporting

confidence: 91%

Heat transfer and entropy generation optimization of forced convection in porous-saturated ducts of rectangular cross-section

Hooman

Gurgenci

Merrikh

2007

International Journal of Heat and Mass Transfer

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“…Entropy generation minimisation combines the fundamental principles of fluid mechanics, heat transfer and thermodynamics in establishing the irreversibility in system components. Several researchers have studied entropy generation in fluid flow and heat transfer for various system configurations and boundary conditions [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. For solar collectors, Bejan [23] …”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios

Mwesigye

Bello‐Ochende

Meyer

2013

Energy

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This paper presents results of a numerical analysis of entropy generation in a parabolic trough receiver at different concentration ratios, inlet temperatures and flow rates. Using temperature dependent thermal properties of the heat transfer fluid, the entropy generation due to heat transfer across a finite temperature difference and entropy generation due to fluid friction in the receiver has been determined. Results show a reduction in the entropy generation rate as the inlet temperature increases and an increase in the entropy generation rate as the concentration ratio increases. Results further show that, there is an optimal flow rate at which the entropy generated is a minimum, for every combination of concentration ratio and inlet temperature. The optimal flow rates at which the entropy generated is minimum are 11.974×10 -3 , 15.395×10 -3 , 18.817×10 -3 , and 22.238×10 -3 and 25.659×10 -3 m 3 /s when the concentration ratio is 40, 60 80 100 and 120 respectively, irrespective of the inlet temperature considered. For the range of inlet temperatures, flow rates and concentration ratios considered, the Bejan number, which measures the contribution of entropy generation due to heat transfer irreversibility to the total entropy generation rate is about 1 at low flow rates and is between 0-0.24 at the highest flow rate.

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“…He found out that the total energy loss (due to pumping process and entropy generation) can be minimized with respect to the duct length for viscous fluids with temperature dependent viscosity. Şahin [4,5] also considered the effect of duct geometries on the entropy generation, both for uniform wall temperature and for uniform heat flux boundary conditions. The various duct geometries like circular, square, rectangular, equilateral triangle, and sinusoidal were considered.…”

Section: Introductionmentioning

confidence: 99%

Second Law Analysis of Laminar Flow in a Circular Pipe Immersed in an Isothermal Fluid

Anand¹,

Nelanti²

2013

Journal of Thermodynamics

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Entropy generation and pumping power to heat transfer ratio (PPR) of a laminar flow, for a circular tube immersed in an isothermal fluid, are studied analytically in this paper. Two different fluids, namely, water and ethylene glycol, are chosen to study the influence of fluid properties on entropy generation and PPR. The expressions for dimensionless entropy generation, Bejan number and PPR are derived in a detailed way and their variations with Reynolds number, external Biot number, and the dimensionless temperature difference are illustrated. The results of the analysis are compared with those for a laminar flow in a circular tube with uniform wall temperature boundary condition. Finally, a criterion is established to determine which type of thermal boundary conditions is more suitable for a particular fluid, with respect to its influence on entropy generation.

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Irreversibilities in various duct geometries with constant wall heat flux and laminar flow

Cited by 99 publications

References 4 publications

Heat transfer and entropy generation optimization of forced convection in porous-saturated ducts of rectangular cross-section

Heat transfer and entropy generation optimization of forced convection in porous-saturated ducts of rectangular cross-section

Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios

Second Law Analysis of Laminar Flow in a Circular Pipe Immersed in an Isothermal Fluid

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