Analysis of Entropy Generation in a Rectangular Porous Duct

Yadav, Shyam Lal; Singh, Ashok Kumar

doi:10.4236/jamp.2016.47143

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Existence of irreversible resources, such as the effect of viscous and thermal dissipations, in the flow field results in entropy generation. Based on the second law of thermodynamics, the local volumetric entropy generation rate for three-dimensional flow is defined as (Yadav and Singh, 2016): …”

Section: Computational Modelmentioning

confidence: 99%

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Abbaszadeh,

Montazeri,

Mirzaie

2023

HFF

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Purpose The purpose of the study is to propose a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance the rate of heat transfer without compromising thermal efficiency. The study numerically investigates the fluid flow characteristics and analyzes the effect of different geometrical configurations, including wall wave amplitude, tape twist angles and nanoparticle volume fractions, on heat transfer improvement and performance factor. Design/methodology/approach This problem is numerically investigated using computational fluid dynamics, and the method is the finite volume method. A two-phase mixture model is used for nanofluid modeling. Findings The study investigated the effect of wall waviness, twisted tape, and nanoparticles on forced convective heat transfer and friction factor behavior in laminar pipe flow in three different Reynolds number regimes. The results showed that implementing twisted tape in wavy tubes significantly increased the rate of heat transfer and the performance factor, with the best twist ratio between 90 and 180°. Adding nanoparticles also enhanced heat transfer and performance factor, but to a lesser extent than wavy wall-twisted tape combinations. The study suggests selecting a proper combination of wavy wall and twisted tape at each Reynolds number to achieve an optimum solution. Originality/value To the best of the authors’ knowledge, the implementation of the selected passive methods in sinusoidal wavy tubes has not been studied before, and no previous studies have taken into account such a mix of heat transfer improvement techniques.

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Section: Computational Modelmentioning

confidence: 99%

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Abbaszadeh,

Montazeri,

Mirzaie

2023

HFF

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“…It was observed that as the nanoparticle volume fraction (VF) increases, the effects of HT become dominant over fluid friction and magnetic effects. Yadav and Singh [17] mathematically investigated a fully developed flow of a viscous incompressible fluid in a rectangular porous duct. It was observed that the EG is double when both the viscous and the Darcy dissipation terms are included in the thermal energy equation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermophysical Property Variation on Entropy Generation towards Micro-Scale

Chauhan

Kumar

et al. 2020

Journal of Non-Equilibrium Thermodynamics

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In this work, the effect of temperature-dependent thermal conductivity (k(T)) and viscosity (\mu (T)) variation on entropy generation in circular channels with an approach from macro- to micro-scale is numerically investigated. Thermally as well as hydrodynamically fully developed flow of water through the fixed length channels with constant total heat flow rate and total mass flow rate is considered. The effects of k(T) variation and \mu (T) variation on entropy generation are analyzed individually as well as collectively. It is observed that in the case of Constant Property Solutions (CPS) {S_{\mathit{gen},\mathit{tot}}} is maximum at the macro-level; however, in the case of combined k(T) and \mu (T) variations it is maximum at the micro-level. The Bejan number (\mathit{Be}) and irreversibility distribution ratio (φ) are also calculated for asserting the dominance of frictional irreversibility and conduction heat transfer irreversibility. Additionally, the optimum diameter ({D^{\ast }}) corresponding to the optimum number of channels is calculated at minimum total entropy generation. It is observed that {D^{\ast }} is minimum for k(T) variation followed by CPS, \mu (T) variation, and combined k(T) and \mu (T) variations.

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“…Hooman [10] et al performed first and the second law analysis through a rectangular duct saturated with porous medium and results are found analytically. Further notable studies [11][12][13][14][15][16][17][18][19][20][21] on entropy analysis are also carried in various geometries.…”

Section: Introductionmentioning

confidence: 99%

Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts

2020

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Original scientific paper https://doi.org/10.2298/TSCI181115029GIn this study, the influence of slip flow and temperature jump on the entropy generation rate are investigated in rectangular microducts. The Knudsen numbers are considered in the range between 0.001 and 0.1, and the aspect ratio lies between 0 and 1. The dimensionless governing equations are solved numerically using Chebyshev spectral collocation method, and the dimensionless velocity and temperature gradients are employed in the entropy generation model. The influences of the dimensionless numbers including Bejan number and irreversibility distribution ratio on the entropy generation rates are investigated and discussed through surface plots and contour diagrams. It is demonstrated that the minimum entropy generation rate exists corresponding to an optimal aspect ratio for each dimensionless number. This minimum entropy generation rate depends upon the nature of dimensionless numbers.

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Analysis of Entropy Generation in a Rectangular Porous Duct

Cited by 5 publications

References 18 publications

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Effect of Thermophysical Property Variation on Entropy Generation towards Micro-Scale

Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts

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