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An　Approach　in　Modeling　Cavitating　Flows　with　gravity　effect

Communications in Nonlinear Science and Numerical Simulation 1997年第2期2卷 44-48页

作者： Zhengtong XIE & Yousheng HE (Institute of Mechanics, CAS, Beijing 100080) (Shanghai Jiao Tong University, Shanghai￣ 200030) Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Shanghai Jiao Tong University Shanghai 200030 China

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关键词： partial cavitation axisymmetric bodies ite ration method gravity effect

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A modeling study of different kinds of sessile droplets on the horizontal surface with surface wettability and gravity effects considered

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Energy Storage and Saving 2022年第1期1卷 22-32页

作者： DANG Qun SONG Mengjie LUO Xiaoyan QU Minglu WANG Xiaotao Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of Technology100081BeijingChina School of Environment&Architecture University of Shanghai for Science&TechnologyNo.516Jungong RoadShanghai200093China CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijing100190China

Droplet phase change is important for energy storage and saving *** initial profile of the droplet is extremely important for its vaporization or solidification on a horizontal *** understand the effect of liquid physical properties on droplet profile,a theoretical model was developed in this study,based on the Young-Laplace equation with gravity effect specially *** the model was experimentally validated by comparing the geometric shape of water droplets,it was further used for predicting droplet shapes of other materials,and thus analyzing the influence of different physical properties,such as temperature,pressure,surface wettability,*** show that the results of this model agree well with the experimental *** maximum and average deviations are less than 4.5%and 1.5%,*** all kinds of droplets on the fixed surfaces,when the temperature increases,the droplet contact radius increases and height *** droplets of nitro-gen and carbon dioxide are more sensitive to temperature than ethanol and ethylene glycol *** 20𝜇L droplets on the surface of contact angle 150°,when the temperature changes from 273.15 K to 293.15 K,the droplet contact radiuses increase by 30.6%for carbon dioxide,1.2%for ethanol and 0.67%for ethylene glycol,and the droplet heights decrease by 42.9%,2.5%,1.1%,*** of this study are meaningful for predicting the phase change process of droplets on the horizontal surface by controlling their initial profiles.

关键词： Sessile droplet Modeling study gravity effect Droplet profile Different materials

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Extremely large-amplitude oscillation of soft pipes conveying fluid under gravity

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1381-1400页

作者： Wei CHEN Ziyang HU Huliang DAI Lin WANG Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China

In this work,the nonlinear behaviors of soft cantilevered pipes containing internal fluid flow are studied based on a geometrically exact model,with particular focus on the mechanism of large-amplitude oscillations of the pipe under *** key parameters,including the flow velocity,the mass ratio,the gravity parameter,and the inclination angle between the pipe length and the gravity direction,are considered to affect the static and dynamic behaviors of the soft *** stability analyses show that,provided that the inclination angle is not equal to π,the soft pipe is stable at a low flow velocity and becomes unstable via flutter once the flow velocity is beyond a critical *** the inclination angle is equal to π,the pipe experiences,in turn,buckling instability,regaining stability,and flutter instability with the increase in the flow ***,the stability of the pipe can be either enhanced or weakened by varying the gravity parameter,mainly dependent on the value of the inclination *** the nonlinear dynamic analysis,it is demonstrated that the post-flutter amplitude of the soft pipe can be extremely large in the form of limit-cycle ***,the oscillating shapes for various inclination angles are provided to display interesting dynamical behaviors of the inclined soft pipe conveying fluid.

关键词： large-amplitude oscillation soft pipe conveying fluid gravity effect flutter

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A study of influence of gravity on bulk behaviour of particulate solid

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Particuology 2008年第6期6卷 467-474页

作者： Yun-Chi Chung Jin Yeam Ooi Department of Civil and Environmental Engineering Nanya Institute of Technology Institute for Infrastructure & Environment School of Engineering & Electronics University of Edinburgh

This paper examines the influence of gravity on the bulk responses of a granular solid. The loading scenarios in this study include confined compression, rod penetration into a granular medium and discharging through an orifice. Similar loading and flow conditions are likely to be encountered in the stress and deformation regimes that regoliths are subjected to in extraterrestrial exploration activities including in situ resource utilisation processes. Both spherical and non-spherical particles were studied using the discrete element method （DEM）. Whilst DEM is increasingly used to model granular solids, careful validations of the simulation outcomes are rather rare. Thus in addition to exploring the effect of gravity, this paper also compares DEM simulations with experiments under terrestrial condition to verify whether DEM can produce satisfactory predictions. The terrestrial experiments were conducted with great care and simulated closely using DEM. The key mechanical and geometrical properties for the particles were measured in laboratory tests for use in the DEM simulations. A series of DEM computations were then performed under reduced gravity to simulate these experiments under extraterrestrial environment. It was found that gravity has no noticeable effect on the force transmission in the confined compression case; the loading gradient in the rod penetration is linearly proportional to the gravity; the mass flow rate in silo discharge is proportional to square root of the gravity and the angle of repose increases with reducing gravity. These findings are in agreement with expectation and existing scientific evidence.

关键词： Extraterrestrial Particulate assembly Confined compression Rod penetration Silo discharge Discrete element method gravity effect

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Numerical Study of Wetting Transitions on Biomimetic Surfaces Using a Lattice Boltzmann Approach with Large Density Ratio

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Journal of Bionic Engineering 2017年第3期14卷 486-496页

作者： Wei Gong Yuying Yan Sheng Chen Donald Giddings Fluids & Thermal Engineering Research Group Faculty of Engineering University of Nottingham University Park Nottingham NG7 2RD UK Center for Fluids & Thermal Engineering University of Nottingham Ningbo China

The hydrophobicity of natural surfaces has drawn much attention of scientific communities in recent years. By mimicking natural surfaces, the manufactured biomimetic hydrophobic surfaces have been widely applied to green technologies such as self-cleaning surfaces. Although the theories for wetting and hydrophobicity have been developed, the mechanism of wetting transitions between heterogeneous wetting state and homogeneous wetting state is still not fully clarified. As understanding of wetting transitions is crucial for manufacturing a biomimetic superhydrophobic surface, more fundamental discussions in this area should be carried out. In the present work, the wetting transitions are numerically studied using a phase field lattice Boltzmann approach with large density ratio, which should be helpful in understanding the mechanism of wetting transitions. The dynamic wetting transition processes between Cassie-Baxter state and Wenzel state are presented, and the energy barrier and the gravity effect on transition are discussed. It is found that the two wetting transition processes are irreversible for specific inherent contact angles and have different transition routes, the energy barrier exists on an ideally patterned surface and the gravity can be crucial to overcome the energy barrier and trigger the transition.

关键词： wetting transitions biomimetic surfaces energy barrier gravity effect numerical study lattice Boltzmann method

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