Irreversibility analysis in unsteady flow over a vertical plate with arbitrary wall shear stress and ramped wall temperature

Khan, Arshad; Karim, Faizan ul; Khan, İlyas; Ali, Farhad; Khan, Dolat

doi:10.1016/j.rinp.2017.12.032

Cited by 19 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From an engineering perspective, the concept of entropy generation analysis can be therefore useful in order to characterize the evolution of thermal processes and also as a design tool in order to avoid the imminent loss of available mechanical power in thermo-fluid systems [13,14], likewise for the conceptual design of jet impingement cooling applications. Various investigations on entropy generation have been reported in the literature for different configurations and physical processes using numerical and analytical approaches, e.g., [11,[15][16][17][18][19][20][21][22]. A detailed description of the theoretical background of entropy generation analysis can be found in [23,24] and elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Ries

Nishad

et al. 2019

Entropy

View full text Add to dashboard Cite

In this work, entropy generation analysis is applied to characterize and optimize a turbulent impinging jet on a heated solid surface. In particular, the influence of plate inclinations and Reynolds numbers on the turbulent heat and fluid flow properties and its impact on the thermodynamic performance of such flow arrangements are numerically investigated. For this purpose, novel model equations are derived in the frame of Large Eddy Simulation (LES) that allows calculation of local entropy generation rates in a post-processing phase including the effect of unresolved subgrid-scale irreversibilities. From this LES-based study, distinctive features of heat and flow dynamics of the impinging fluid are detected and optimal operating designs for jet impingement cooling are identified. It turned out that (1) the location of the stagnation point and that of the maximal Nusselt number differ in the case of plate inclination; (2) predominantly the impinged wall acts as a strong source of irreversibility; and (3) a flow arrangement with a jet impinging normally on the heated surface allows the most efficient use of energy which is associated with lowest exergy lost. Furthermore, it is found that increasing the Reynolds number intensifies the heat transfer and upgrades the second law efficiency of such thermal systems. Thereby, the thermal efficiency enhancement can overwhelm the frictional exergy loss.

show abstract

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Ries

Nishad

et al. 2019

Entropy

View full text Add to dashboard Cite

show abstract

“…Recently, Kumar et al [12] discussed the fractional model for radial fins with heat transfer. Some of the latest results, according to this research, are given in Gupta et al [13], Khan et al [14], and Imran et al [15].…”

Section: Introductionmentioning

confidence: 68%

Computational Results With Non-singular and Non-local Kernel Flow of Viscous Fluid in Vertical Permeable Medium With Variant Temperature

et al. 2020

View full text Add to dashboard Cite

This present article explores the transversal magnetized flow of a viscous fluid. The flow is confined to a vertical wall, saturated in permeable medium, along with ramped wall temperature. In this study, the conjugate impact of heat and mass transfer with slip and non-slip conditions are considered in the velocity field and energy equation. The dimensionless Atangana-Baleanu fractional governing equations are derived with Laplace transformation. Computational results are expressed graphically with the effect of various physical parameters. Comparative graphical analysis of the Atangana-Baleanu derivative for temperature, concentration and velocity field, with slip and non-slip impact, shows that the memory effects of the Atangana-Baleanu derivative are better than the results that exist in the literature.

show abstract

“…Afridi et al (2018) analyzed entropy generated over a curved surface by varying its thermal conductivity using the generalized differential quadrature method and observed that motion of fluid decelerates with increasing strength of applied magnetic field. Khan et al (2018aKhan et al ( , 2018b) investigated flow that is unsteady, including ramped wall temperature, wall shear stress over a vertical plate, and noted that production of entropy in a thermal system can be reduced by decreasing thermal radiation. Kumar et al (2019) analyzed irreversibility for the three-dimensional (3D) flow of carbon nanotubes (CNTs) due to nonquartic chemical reactions and rate of entropy augmentation is under control by minimizing the action of the Brinkman and Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic irreversibility of Al₂O₃–H₂O nanofluid Poiseuille flow with variable viscosity and convective cooling

Almeida

Gireesha

Venkatesh

et al. 2020

HFF

View full text Add to dashboard Cite

Purpose This study aims to investigate the flow behavior of aluminum oxide–water nanofluid with variable viscosity flowing through the microchannel parallel with the ground, with low aspect ratio. The study focuses on the first and second law analyses of Poiseuille flow using water as the base fluid with alumina nanoparticles suspended in it. Combined effects of thermal radiation, viscous dissipation, variable viscosity, nanoparticle shape factor and volume fraction on the thermal performance are studied and the in-built irreversibility in the process is examined. Design/methodology/approach The governing equations with dimensions are reduced to non-dimensional equations by using dimensionless quantities. Then, the Runge–Kutta–Fehlberg shooting scheme tackles the present non-linear equations. Findings The outcomes of the present analysis reveal that the activation energy parameter with its increase, depletes the exergetic effectiveness of the system, thus defending the fact to keep the activation energy parameter the lowest as possible for the system efficiency. In addition, thermal radiation and Biot number enhance the release of heat energy, thereby cooling the system. Bejan number graph exhibits the decreasing behavior for the increased nanoparticle shape factor, whereas the temperature enhances with the rise in nanoparticle shape factor. Originality/value The effects of nanoparticle shape factor in Poiseuille flow for alumina–water nanoliquid in low aspect ratio microchannel is inspected at the earliest. Exergetic effectiveness of the system is studied and heat transfer characteristics are explored for thermal radiation effect and activation energy parameter. Besides, BeηSphere>BeηBlades.

show abstract

Irreversibility analysis in unsteady flow over a vertical plate with arbitrary wall shear stress and ramped wall temperature

Cited by 19 publications

References 31 publications

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Computational Results With Non-singular and Non-local Kernel Flow of Viscous Fluid in Vertical Permeable Medium With Variant Temperature

Intrinsic irreversibility of Al₂O₃–H₂O nanofluid Poiseuille flow with variable viscosity and convective cooling

Contact Info

Product

Resources

About

Irreversibility analysis in unsteady flow over a vertical plate with arbitrary wall shear stress and ramped wall temperature

Cited by 19 publications

References 31 publications

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Entropy Generation Analysis and Thermodynamic Optimization of Jet Impingement Cooling Using Large Eddy Simulation

Computational Results With Non-singular and Non-local Kernel Flow of Viscous Fluid in Vertical Permeable Medium With Variant Temperature

Intrinsic irreversibility of Al2O3–H2O nanofluid Poiseuille flow with variable viscosity and convective cooling

Contact Info

Product

Resources

About

Intrinsic irreversibility of Al₂O₃–H₂O nanofluid Poiseuille flow with variable viscosity and convective cooling