Entropy generation analysis for grooved structure plate flow

Liu, Mei; Li, Shuguang; Wu, Zhengren; Zhang, Kaishun; Wang, Songling; Liang, Xiujun

doi:10.1016/j.euromechflu.2019.04.017

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…For the predicted equation, 𝑢 over the grooved plate is unknown before numerical calculation or experimental measurement, so all 𝑢 in Equation ( 15) is converted to 𝑢 . Similarly, 𝑈 in Equation ( 14) can be expressed as Equation (17) with 𝑢 .…”

Section: The Relationship Between Slip Velocity (U +mentioning

confidence: 99%

“…Lee et al [16] observed that the maximum measured drag reduction of 40% was achieved by a nanoporous transverse grooved plate. Liu et al [17] used large eddy simulation (LES) technology to analyze entropy generation in the flow over a transverse grooved plate. The results showed that the total entropy generation in the near-wall region decreased by approximately 25%.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Analytical Solution of Optimum and Maximum Depth of Transverse V-Groove for Drag Reduction at Different Reynolds Numbers

Zheng

2022

Symmetry

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Reducing the skin-friction drag of a vehicle is an important way to reduce carbon emissions. Previous studies have investigated the drag reduction mechanisms of transverse grooves. However, it is more practical to investigate which groove geometry is optimal at different inflow conditions for engineering. The purpose of this paper is to establish the physical model describing the relationship between the dimensionless depth (H+=Huτ/υ) of the transverse groove, the dimensionless inflow velocity (U∞+=U∞/uτ), and the drag reduction rate (η) to quasi-analytically solve the optimal and maximum transverse groove depth according to the Reynolds numbers. Firstly, we use the LES with the dynamic subgrid model to investigate the drag reduction characteristics of transverse V-grooves with different depths (h = 0.05~0.9 mm) at different Reynolds numbers (1.09×104~5.44×105) and find that H+ and U∞+ affect the magnitude of slip velocity (Us+), thus driving the variation of the viscous drag reduction rate (ην) and the increased rate of pressure drag (ηp). Moreover, the relationship between Us+, ην, and ηp is established based on the slip theory and the law of pressure distribution. Finally, the quasi-analytical solutions for the optimal and maximum depths are solved by adjusting Us+ to balance the cost (ηp) and benefit (ην). This solution is in good agreement with the present numerical simulations and previous experimental results.

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Section: The Relationship Between Slip Velocity (U +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi-Analytical Solution of Optimum and Maximum Depth of Transverse V-Groove for Drag Reduction at Different Reynolds Numbers

Zheng

2022

Symmetry

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“…Serson et al [22] studied the method of wing span corrugation to improve the aerodynamic performance of the airfoil with the help of DNS method, and found that the corrugation would reduce the lift-drag ratio of the airfoil. Liu et al [23] analyzed the microstructure drag reduction mechanism from the perspective of entropy generation, and showed that the groove structure can reduce the entropy generation in the flow process. Domel et al [24] arranged a new type of tooth structure on the suction side of the airfoil and found that the airfoil drag can be reduced, the lift increased, and the momentum loss in the boundary layer caused by wall friction can be supplemented.…”

Section: •3•mentioning

confidence: 99%

Numerical study on flow characteristics of airfoil with bionic micro-grooves

Cheng

Yang

et al. 2022

J Braz. Soc. Mech. Sci. Eng.

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“…Features of dissipative unsteady flow and EG with thermo-diffusion and diffusion thermo effects are reported by Hayat et al [39] Recent developments on entropy generation are described in Refs. [40][41][42][43][44][45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Physical aspects of magnetized Jeffrey nanomaterial flow with irreversibility analysis

Haq¹,

Khan²,

Khan³

et al. 2022

Chinese Phys. B

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This analysis presents the applications of entropy generation phenomenon in incompressible flow of Jeffrey nanofluid in presence of distinct thermal features. The novel aspects of various features like Joule heating, porous medium, dissipation features and radiative mechanism is addressed. In order to improve the thermal transportation systems based on nanomaterials, the convective boundary conditions are introduced. The thermal viscoelastic nanofluid model is expressed in term of differential equations. The problem is presented via nonlinear differential equations for which analytical expressions are obtained by using homotopy analysis method(HAM). The accuracy of solution is ensured. The effective outcomes of all physical parameters associated with the flow model are carefully examined and underlined through various curves. The observations summarized from current analysis reveal that presence of permeability parameter offers resistance to the flow. A monotonic decrement in local Nusselt number is noted with Hartmann number and Prandtl number. Moreover, entropy generation and Bejan number increases with radiation parameter and fluid parameter.

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Entropy generation analysis for grooved structure plate flow

Cited by 13 publications

References 24 publications

Quasi-Analytical Solution of Optimum and Maximum Depth of Transverse V-Groove for Drag Reduction at Different Reynolds Numbers

Quasi-Analytical Solution of Optimum and Maximum Depth of Transverse V-Groove for Drag Reduction at Different Reynolds Numbers

Numerical study on flow characteristics of airfoil with bionic micro-grooves

Physical aspects of magnetized Jeffrey nanomaterial flow with irreversibility analysis

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