Solving coupled boundary slip and heat transfer EHL problem under large slide–roll ratio conditions

Zhao, Yi; Wong, P.L.; Mao, Junhong

doi:10.1016/j.triboint.2019.01.013

Cited by 13 publications

(4 citation statements)

References 30 publications

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“…The relationships between contact angle, wettability, and slip length are studied by the molecular dynamics, the large eddy simulation turbulence model, and the finite volume method. The results show that the higher contact angle leads to greater slip, which can effectively reduce friction and produce a drag reduction effect on the superhydrophobic surface [ 85 , 86 , 87 , 88 , 89 ]. The experimental method also confirms that the obvious velocity slip can be measured on the superhydrophobic surface and that the velocity slip is the main reason for the drag reduction of the liquid on the superhydrophobic surface [ 90 , 91 , 92 ].…”

Section: Superhydrophobic Surface Drag Reductionmentioning

confidence: 99%

A Review of Recent Advances in Superhydrophobic Surfaces and Their Applications in Drag Reduction and Heat Transfer

Zhang

Yang

et al. 2021

Nanomaterials

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Inspired by the superhydrophobic properties of some plants and animals with special structures, such as self-cleaning, water repellent, and drag reduction, the research on the basic theory and practical applications of superhydrophobic surfaces is increasing. In this paper, the characteristics of superhydrophobic surfaces and the preparation methods of superhydrophobic surfaces are briefly reviewed. The mechanisms of drag reduction on superhydrophobic surfaces and the effects of parameters such as flow rate, fluid viscosity, wettability, and surface morphology on drag reduction are discussed, as well as the applications of superhydrophobic surfaces in boiling heat transfer and condensation heat transfer. Finally, the limitations of adapting superhydrophobic surfaces to industrial applications are discussed. The possibility of applying superhydrophobic surfaces to highly viscous fluids for heat transfer to reduce flow resistance and improve heat transfer efficiency is introduced as a topic for further research in the future.

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Section: Superhydrophobic Surface Drag Reductionmentioning

confidence: 99%

A Review of Recent Advances in Superhydrophobic Surfaces and Their Applications in Drag Reduction and Heat Transfer

Zhang

Yang

et al. 2021

Nanomaterials

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“…Then, Chen et al (2013) studied the influence of anisotropic slip velocity under point contact conditions, and the results showed that in several cases with different slip lengths, the flow through the film thickness distribution was more sensitive to slip in the sliding direction. Recently, Zhao et al (2019) investigated the coupled effects of velocity slip and heat in a thermal point EHL, and the results showed that the value of film thickness decreased first and then increased and was relatively stable. More recently, Meng et al (2021) conducted a thermal point EHL under pure rolling and zero entrainment velocity contact and concluded that the influence of velocity slip on film thickness weakened with the increase of entrainment velocity.…”

Section: Introductionmentioning

confidence: 99%

Effect of boundary slip on elastohydrodynamic lubrication with arbitrary entrainment angle in elliptical contacts

Cao

Cai

Wang

et al. 2023

ILT

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Purpose The purpose of this study is to describe and observe the influence of boundary slip associated with an arbitrary entrainment angle on the contact lubrication properties of ellipses. Design/methodology/approach Based on the modified Reynolds equation, the boundary slip of any angle is considered in the elliptic contact, and numerical simulation is carried out. In the above calculation, the progressive mesh densification method is used, which greatly reduces the computation time. Findings The results indicate that the variation of film thickness corresponding to different entrainment angles is distinct from those without considering boundary slip. In addition, boundary slip reduces the central film thickness and minimum film thickness, which makes the hydrodynamic pressure distribution smoother. Originality/value The present study focuses on the specific condition with the arbitrary direction of rolling and sliding velocity found in hypoid gears and worm, and some other components. The influence of boundary slip associated with arbitrary entrainment angle on the lubrication film thickness in elliptical contacts is first revealed, which improves a good understanding of elastohydrodynamic lubrication characteristics.

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“…The concept of how the slip effects temperature rise and its coupling effect with heat are still unknown. But the researcher like Zhao et al [41] discussed the effect of boundary slip on thermal EHL point contact problem. And studied the coupled effects on boundary slip and heat on EHL contacts under large slide to roll ratios.…”

Section: Introductionmentioning

confidence: 99%

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

Awati,

Obannavar,

Nanjaiah

2023

Mech. Eng. Advan.

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The paper presents, the numerical investigation of point contact thermal elasto-hydrodynamic lubrication (EHL) with surface asperities are analyzed. The effect of temperature and surface roughness on fluid film thickness is studied in detail. The governing equations comprises Reynolds, film thickness, load balance and energy equations with appropriate boundary conditions. The second order finite difference approximation is used to discretize the governing equations and the resultant nonlinear system of algebraic equations is solved using Multigrid V-cycle with full approximation scheme (FAS) technique. Multi level multi integration (MLMI) technique is employed to solve the film thickness equation. The obtained results are illustrated in the form of graphs and tables which are comparable with earlier findings. The film thickness profiles shows dimple near to the outlet region due to temperature-viscosity wedge mechanism. Isothermal minimum film thickness is higher than the thermal minimum film thickness. Minimum film thickness is much smaller due to slide to roll ratio is positive ascompared to negative, whereas the behavior of central film thickness is contrast as that of minimum film thickness.

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Solving coupled boundary slip and heat transfer EHL problem under large slide–roll ratio conditions

Cited by 13 publications

References 30 publications

A Review of Recent Advances in Superhydrophobic Surfaces and Their Applications in Drag Reduction and Heat Transfer

A Review of Recent Advances in Superhydrophobic Surfaces and Their Applications in Drag Reduction and Heat Transfer

Effect of boundary slip on elastohydrodynamic lubrication with arbitrary entrainment angle in elliptical contacts

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

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