Entropy generation analysis as a design tool—A review

Sciacovelli, Adriano; Verda, Vittorio; Sciubba, Enrico

doi:10.1016/j.rser.2014.11.104

Cited by 222 publications

(105 citation statements)

References 129 publications

(200 reference statements)

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…In natural and mixed convection system flow, Oztop et al [10] reviewed the entropy generation exploitation, while other authors focused on laminar and turbulent forced convection (see [11]). A recent review by Sciacovelli et al [12] provided a good documented report of contributions to the theory and application of entropy generation analysis to different types of engineering systems. Especially, focus was put on contributions oriented toward the use of entropy generation analysis as a tool for the design and optimization of engineering systems.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions

Ries

Janicka

Sadiki

2017

Entropy

View full text Add to dashboard Cite

Abstract:In the present paper, thermal transport and entropy production mechanisms in a turbulent round jet of compressed nitrogen at supercritical thermodynamic conditions are investigated using a direct numerical simulation. First, thermal transport and its contribution to the mixture formation along with the anisotropy of heat fluxes and temperature scales are examined. Secondly, the entropy production rates during thermofluid processes evolving in the supercritical flow are investigated in order to identify the causes of irreversibilities and to display advantageous locations of handling along with the process regimes favorable to mixing. Thereby, it turned out that (1) the jet disintegration process consists of four main stages under supercritical conditions (potential core, separation, pseudo-boiling, turbulent mixing), (2) causes of irreversibilities are primarily due to heat transport and thermodynamic effects rather than turbulence dynamics and (3) heat fluxes and temperature scales appear anisotropic even at the smallest scales, which implies that anisotropic thermal diffusivity models might be appropriate in the context of both Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) approaches while numerically modeling supercritical fluid flows.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions

Ries

Janicka

Sadiki

2017

Entropy

View full text Add to dashboard Cite

show abstract

“…A second consequence, and a possible application of generalized entropy and its components, may be the analysis of complex and biological systems as already reported in the literature [15][16][17][18][19][20][21] with the aim of analyzing laws governing the self-assembling and self-organizing processes of atomic and molecular interactions at microscopic level.…”

Section: Discussionmentioning

confidence: 99%

A Method to Derive the Definition of Generalized Entropy from Generalized Exergy for Any State in Many-Particle Systems

Palazzo

2015

Entropy

View full text Add to dashboard Cite

Abstract:The literature reports the proofs that entropy is an inherent property of any system in any state and governs thermal energy, which depends on temperature and is transferred by heat interactions. A first novelty proposed in the present study is that mechanical energy, determined by pressure and transferred by work interactions, is also characterized by the entropy property. The second novelty is that a generalized definition of entropy relating to temperature, chemical potential and pressure of many-particle systems, is established to calculate the thermal, chemical and mechanical entropy contribution due to heat, mass and work interactions. The expression of generalized entropy is derived from generalized exergy, which in turn depends on temperature, chemical potential and pressure of the system, and by the entropy-exergy relationship constituting the basis of the method adopted to analyze the available energy and its transfer interactions with a reference system which may be external or constitute a subsystem. This method is underpinned by the Second Law statement enunciated in terms of existence and uniqueness of stable equilibrium for each value of energy content of the system. The equality of chemical potential and equality of pressure are assumed, in addition to equality of temperature, to be necessary conditions for stable equilibrium.

show abstract

“…There are two sources of entropy generation in a solar collector for heating air [6][7][8][22][23][24][25]. The first entropy generation is due to loss of energy owing to the friction between the collector surface and the air flowing through it, and the second one is due to the heat transfer or temperature change in the heat carrier fluid (air).…”

Section: Entropy Generation Analysis Of Solar Collectormentioning

confidence: 99%

Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

Prasad

Sahu

2017

Archives of Thermodynamics

View full text Add to dashboard Cite

This paper presents mathematical modelling and numerical analysis to evaluate entropy generation analysis (EGA) by considering pressure drop and second law efficiency based on thermodynamics for forced convection heat transfer in rectangular duct of a solar air heater with wire as artificial roughness in the form of arc shape geometry on the absorber plate. The investigation includes evaluations of entropy generation, entropy generation number, Bejan number and irreversibilities of roughened as well as smooth absorber plate solar air heaters to compare the relative performances. Furthermore, effects of various roughness parameters and operating parameters on entropy generation have also been investigated. Entropy generation and irreversibilities (exergy destroyed) has its minimum value at relative roughness height of 0.0422 and relative angle of attack of 0.33, which leads to the maximum exergetic efficiency. Entropy generation and exergy based analyses can be adopted for the evaluation of the overall performance of solar air heaters.

show abstract

Entropy generation analysis as a design tool—A review

Cited by 222 publications

References 129 publications

Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions

Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions

A Method to Derive the Definition of Generalized Entropy from Generalized Exergy for Any State in Many-Particle Systems

Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

Contact Info

Product

Resources

About