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Surface Gravity Waves: Shallow Water Fluid Particle Physics
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作者 Kern E. Kenyon 《Natural Science》 2020年第10期681-683,共3页
One of</span><span style="color:red;"> </span><span style="font-family:Verdana;">Newton’s mathematical solutions to a hypothetical orbital problem, recently verified by an ... One of</span><span style="color:red;"> </span><span style="font-family:Verdana;">Newton’s mathematical solutions to a hypothetical orbital problem, recently verified by an independent physics model, is applied to the fluid particle motion in shallow water surface gravity waves. What is the functional form of the central force, with origin at the ellipse’s center, which will keep a body in the orbit? Newton found out it is the spring force, which is linear. All fluid particles in shallow water waves move in ellipses. By a superposition of solutions in a linear problem, the application of Newton’s result to shallow water waves is combined with a feature not noticed by Newton: the orbital period is independent of the semi-major and semi-minor axes. Two conclusions reached are that the wave period of shoaling waves should be constant and that there is no friction in these waves. 展开更多
关键词 Shallow Water Waves fluid Particle physics
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Recent Progress in Space Science and Applications on Chinese Space Station in 2022–2024
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作者 GU Yidong GAO Ming +4 位作者 ZHAO Guangheng WANG Qiang LYU Congmin ZHONG Hongen LIU Guoning 《空间科学学报》 CAS CSCD 北大核心 2024年第4期607-621,共15页
Chinese Space Station(CSS)has been fully deployed by the end of 2022,and the facility has entered into the application and development phase.It has conducted scientific research projects in various fields,such as spac... Chinese Space Station(CSS)has been fully deployed by the end of 2022,and the facility has entered into the application and development phase.It has conducted scientific research projects in various fields,such as space life science and biotechnology,space materials science,microgravity fundamental physics,fluid physics,combustion science,space new technologies,and applications.In this review,we introduce the progress of CSS development and provide an overview of the research conducted in Chinese Space Station and the recent scientific findings in several typical research fields.Such compelling findings mainly concern the rapid solidification of ultra-high temperature alloy melts,dynamics of fluid transport in space,gravity scaling law of boiling heat transfer,vibration fluidization phenomenon of particulate matter,cold atom interferometer technology under high microgravity and related equivalence principle testing,the full life cycle of rice under microgravity and so forth.Furthermore,the planned scientific research and corresponding prospects of Chinese space station in the next few years are presented. 展开更多
关键词 Chinese Space Station(CSS) Space material science Micro-gravity fluid physics Fundamental physics Space life sciences and biotechnology
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Physics-Aware Deep Learning on Multiphase Flow Problems 被引量:1
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作者 Zipeng Lin 《Communications and Network》 2021年第1期1-11,共11页
In this article, a physics aware deep learning model is introduced for multiphase flow problems. The deep learning model is shown to be capable of capturing complex physics phenomena such as saturation front, which is... In this article, a physics aware deep learning model is introduced for multiphase flow problems. The deep learning model is shown to be capable of capturing complex physics phenomena such as saturation front, which is even challenging for numerical solvers due to the instability. We display the preciseness of the solution domain delivered by deep learning models and the low cost of deploying this model for complex physics problems, showing the versatile character of this method and bringing it to new areas. This will require more allocation points and more careful design of the deep learning model architectures and residual neural network can be a potential candidate. 展开更多
关键词 Deep Learning Neural Network MULTI-PHASE Oil Incompressible fluid physics Partial Differential Equation
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Influences of fluid physical properties,solid particles,and operating conditions on the hydrodynamics in slurry reactors 被引量:2
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作者 He Yang Aqiang Chen +4 位作者 Shujun Geng Jingcai Cheng Fei Gao Qingshan Huang Chao Yang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第4期51-71,共21页
Slurry reactors are popular in many industrial processes,involved with numerous chemical and biological mixtures,solid particles with different concentrations and properties,and a wide range of operating conditions.Th... Slurry reactors are popular in many industrial processes,involved with numerous chemical and biological mixtures,solid particles with different concentrations and properties,and a wide range of operating conditions.These factors can significantly affect the hydrodynamic in the slurry reactors,having remarkable effects on the design,scale-up,and operation of the slurry reactors.This article reviews the influences of fluid physical properties,solid particles,and operating conditions on the hydrodynamics in slurry reactors.Firstly,the influence of fluid properties,including the density and viscosity of the individual liquid and gas phases and the interfacial tension,has been reviewed.Secondly,the solid particle properties(i.e.,concentration,density,size,wettability,and shape)on the hydrodynamics have been discussed in detail,and some vital but often ignored features,especially the influences of particle wettability and shape,as well as the variation of surface tension because of solid concentration alteration,are highlighted in this work.Thirdly,the variations of physical properties of fluids,hydrodynamics,and bubble behavior resulted from the temperature and pressure variations are also summarized,and the indirect influences of pressure on viscosity and surface tension are addressed systematically.Finally,conclusions and perspectives of these notable influences on the design and scale-up of industrial slurry reactors are presented. 展开更多
关键词 Multiphase reactors fluid physical properties PARTICLE Operating conditions Bubble column Airlift loop reactor
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Thin Film Flow of a Second Grade Fluid over a Stretching/Shrinking Sheet with Variable Temperature-Dependent Viscosity 被引量:3
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作者 S. Nadeem Naeem Faraz 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期212-215,共4页
Effects of variable viscosity on the flow and heat transfer in a thin film on a horizontal porous stretching sheet are analyzed. The steady boundary layer equations for momentum and thermal energy are simplified by us... Effects of variable viscosity on the flow and heat transfer in a thin film on a horizontal porous stretching sheet are analyzed. The steady boundary layer equations for momentum and thermal energy are simplified by using similarity transformations. The resulted and coupled nonlinear differential equations are solved by Homotopy analysis method. The results are presented graphically to interpret various physical parameters appearing in the problem. 展开更多
关键词 Soft matter liquids and polymers fluid dynamics Mathematical physics
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Stretching a Curved Surface in a Viscous Fluid 被引量:4
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作者 M. Sajid N. Ali +1 位作者 T. Javed Z. Abbas 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第2期149-152,共4页
This work is concerned with the viscous flow due to a curved stretching sheet. The similarity solution of the problem is obtained numerically by a shooting method using the Runge-Kutta algorithm. The physical quantiti... This work is concerned with the viscous flow due to a curved stretching sheet. The similarity solution of the problem is obtained numerically by a shooting method using the Runge-Kutta algorithm. The physical quantities of interest like the fluid velocity and skin friction coefficient are obtained and discussed under the influence of dimensionless curvature. It is evident from the results that dimensionless curvature causes an increase in boundary layer thickness and a decrease in the skin friction coefficient. 展开更多
关键词 fluid dynamics Mathematical physics
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Generalized Lorenz Equation Derived from Thermal Convection of Viscoelastic Fluids in a Loop
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作者 杨帆 朱克勤 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期196-199,共4页
A new generalized Lorenz system is presented based on the thermal convection of Oldroyd-B fluids in a circular loop. Two non-dimensional parameters De1 (a measure of the fluid relaxation) and De2 (a measure of the ... A new generalized Lorenz system is presented based on the thermal convection of Oldroyd-B fluids in a circular loop. Two non-dimensional parameters De1 (a measure of the fluid relaxation) and De2 (a measure of the fluid retardation) appear in the equation. Then we study this generalized Lorenz equation numerically and find that the values of De1 and De2 can greatly influence the behavior of the solution. The fluid relaxation De1 is found to precipitate the onset of periodic solution (limit cycle) in the system and impedes the onset of chaos while the fluid retardation (De2) tends to delay the onset of the periodic solution and precipitate the onset of chaos in the system. 展开更多
关键词 fluid dynamics Mathematical physics Statistical physics and nonlinear systems
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MICROGRAVITY EXPERIMENTS OF TWO-PHASE FLOW PATTERNS ABOARD MIR SPACE STATION 被引量:4
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作者 赵建福 解京昌 +1 位作者 林海 胡文瑞 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2001年第2期151-159,共9页
A first experimental study on two-phase how patterns at a long-term, steady microgravity condition was conducted on board the Russian Space Station 'MIR' in August 1999. Carbogal and air are used as the liquid... A first experimental study on two-phase how patterns at a long-term, steady microgravity condition was conducted on board the Russian Space Station 'MIR' in August 1999. Carbogal and air are used as the liquid and the gas phase, respectively. Bubble, slug, slug-annular transitional, and annular hows are observed. A new region of annular how with lower liquid superficial velocity is discovered, and the region of the slug-annular transitional flow is wider than that observed by experiments on board the parabolic aircraft. The main patterns are bubble, slug-annular transitional and annular flows based on the experiments on board MIR space station. Some influences on the two-phase how patterns in the present experiments are discussed. 展开更多
关键词 two-phase flow microgravity fluid physics space experiment
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Recent Progress of Microgravity Science Research in China
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作者 ZHAO Jianfu DU Wangfang +12 位作者 KANG Qi LAN Ding LI Kai LI Weibin LIU Y C LUO Xinghong MIAO Jianyin WANG Qinggong WANG Shuangfeng ZHANG Tao ZHANG Xingwang ZHANG Yonghai ZHENG Huiqiong 《空间科学学报》 CAS CSCD 北大核心 2022年第4期772-785,共14页
Microgravity science is an important branch of space science.Its major objective is to study the laws of materials movement in microgravity,as well as to reveal the influence of gravity on the movement of materials in... Microgravity science is an important branch of space science.Its major objective is to study the laws of materials movement in microgravity,as well as to reveal the influence of gravity on the movement of materials in different gravity environments.Application researches relevant to these basic studies are also important contents of microgravity science.The advanced subjects,to some extent,reflect the ability of human beings to understand nature and the R&D level in this field in various countries.In this paper,the recent progress and the latest achievements of microgravity science and application researches in China aboard space platforms such as the Core Capsule Tianhe of the China Space Station(CSS)and satellites,as well as utilizing ground-based short-term microgravity facilities such as the Drop Tower Beijing and TUFF,are summarized,which cover the following sub-disciplines:microgravity fluid physics,microgravity combustion science,space materials science,space fundamental physics,space bio-technology,and relevant space technology applications. 展开更多
关键词 Microgravity science China Space Station(CSS) Ground-based short-term microgravity platforms Microgravity fluid physics Microgravity combustion science Space materials science Space fundamental physics Space bio-technology
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Change in Continuous Detonation Wave Propagation Mode from Rotating Detonation to Standing Detonation 被引量:20
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作者 邵业涛 王健平 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期216-219,共4页
We perform a three-dimensional numerical simulation based on a one-step chemical reaction model to investigate changes in the mode of H2-Air detonation wave propagation from rotating detonation wave (RDW) mode to st... We perform a three-dimensional numerical simulation based on a one-step chemical reaction model to investigate changes in the mode of H2-Air detonation wave propagation from rotating detonation wave (RDW) mode to standing detonation wave mode. The physical characteristics of an RDW with injection velocity of 500 m/s are analyzed to investigate the physical mechanisms involved. We find that with increasing injection velocity, the detonation wave gradually changes from perpendicular to the head wall to parallel to the head wall. When the injection velocity exceeds the Chapman-Jouguet velocity VCJ (about 1984 m/s), the detonation wave changes orientation to become perpendicular to the fuel injection direction, and the rotating mode changes accordingly to a standing mode. Finally, the plane detonation characteristic triple-wave structures can be found from the standing mode. 展开更多
关键词 fluid dynamics Chemical physics and physical chemistry
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Mechanism Responsible for the Complete Suppression of Kármán Vortex in Flows Past a Wavy Square-Section Cylinder 被引量:4
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作者 林黎明 凌国灿 吴应湘 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期204-207,共4页
The Kármán vortex shedding is totally suppressed in flows past a wavy square-section cylinder at a Reynolds number of 100 and the wave steepness of 0.025. Such a phenomenon is illuminated by the numerical si... The Kármán vortex shedding is totally suppressed in flows past a wavy square-section cylinder at a Reynolds number of 100 and the wave steepness of 0.025. Such a phenomenon is illuminated by the numerical simulations. In the present study, the mechanism responsible for it is mainly attributed to the vertical vorticity. The geometric disturbance on the rear surface leads to the appearance of spanwise flow near the base. The specific vertical vorticity is generated on the rear surface and convecting into the near wake. The wake flow is recirculated with the appearance of the pair of recirculating cells. The interaction between the upper and lower shear layers is weakened by such cells, so that the vortex rolls could not be formed and the near wake flow becomes stable. 展开更多
关键词 fluid dynamics Mathematical physics
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Analysis of High Codimensional Bifurcation and Chaos for the Quad Bundle Conductor's Galloping 被引量:4
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作者 刘富豪 张琪昌 谭莹 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期171-174,共4页
A two-degree-of-freedom model of iced, electrical quad bundle conductor is developed to comprehensively describe the different galloping behaviors observed. By applying centre manifold and invertible linear transforma... A two-degree-of-freedom model of iced, electrical quad bundle conductor is developed to comprehensively describe the different galloping behaviors observed. By applying centre manifold and invertible linear transformation, the co-dimension-2 bifurcation is analyzed. The relationships of parameters between this system and the original system are obtained to analyze and to control the galloping of the quad iced bundle conductor. The space trajectory, Lyapunov exponent and Lyapunov dimension are investigated via numerical simulation to present a rigorous proof of existence of chaos. 展开更多
关键词 fluid dynamics Mathematical physics Statistical physics and nonlinear systems
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Analysis of Hysteretic Strongly Nonlinearity for Quad Iced Bundle Conductors 被引量:3
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作者 刘富豪 张琪昌 王炜 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期208-211,共4页
A new hysteretic nonlinear model of quad iced bundle conductors is constructed. The bifurcation equation is obtained by applying the undetermined fundamental frequency method of the complex normal form. The transition... A new hysteretic nonlinear model of quad iced bundle conductors is constructed. The bifurcation equation is obtained by applying the undetermined fundamental frequency method of the complex normal form. The transition set and bifurcation diagrams for the singularity are presented. Then the corresponding relations between the unfolding parameters and the system parameters are given, and the sensitivity parameters and its range of values are obtained to analyze and to control the galloping of the quad iced bundle conductor. 展开更多
关键词 fluid dynamics Mathematical physics Electronics and devices
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Using Gamma-Radiation for Drug Releasing from MWNT Vehicle 被引量:1
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作者 李俊 孙浩 戴耀东 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期297-299,共3页
A drug delivery system via multi-walled carbon nanotube (MWNT) vehicle was synthesized in aqueous solution. MWNTs were first noncovalently functionalized with chitosan oligomers (CS) with a molecule weight of 4000... A drug delivery system via multi-walled carbon nanotube (MWNT) vehicle was synthesized in aqueous solution. MWNTs were first noncovalently functionalized with chitosan oligomers (CS) with a molecule weight of 4000-6000, making MWNTs water-soluble, and then a cancer ancillary drug tea polyphenols (TP) was conjugated mainly via the hydrogen bond between CS and TP molecules, making MWNTs efficient vehicle for drug delivering. The release of drug molecules can be realized by pH variation and γ-radiation, leading to new methods for controlling drug release from carbon nanotubes carrier. Due to the high penetrability of γ-rays, γ-radiation shows up new opportunities in controlled drug release, possibly facilitating the future cancer treatment in vivo. 展开更多
关键词 Soft matter liquids and polymers Atomic and molecular physics fluid dynamics Medical physics Biological physics
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Measurement of Plasma Density Produced in Dielectric Barrier Discharge for Active Aerodynamic Control with Interferometer 被引量:1
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作者 李钢 张翼 +3 位作者 徐燕骥 林彬 李玉同 朱俊强 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第10期136-139,共4页
We utilize an interferometer to investigate the changes of the refractive index caused by dielectric barrier discharge plasma. The electronic density of the plasma produced is measured and analyzed tentatively. The re... We utilize an interferometer to investigate the changes of the refractive index caused by dielectric barrier discharge plasma. The electronic density of the plasma produced is measured and analyzed tentatively. The results show that density of the plasma increases linearly with exciting voltages. 展开更多
关键词 fluid dynamics Plasma physics
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Local Heating Effect of Flow Past a Circular Cylinder 被引量:1
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作者 辛晓峰 陈诚 +2 位作者 王伯福 马东军 孙德军 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期167-170,共4页
Heating effects of air flows past a two-dimensional circular cylinder at low Reynolds numbers and low Mach numbers are investigated by numerical simulation. The cylinder wall is heated partially rather than heated on ... Heating effects of air flows past a two-dimensional circular cylinder at low Reynolds numbers and low Mach numbers are investigated by numerical simulation. The cylinder wall is heated partially rather than heated on the whole surface as with previous researches. The heating effects are completely different for various heating locations on the cylinder surface. Heating either windward or leeward side stabilizes the flow and reduces or completely suppresses vortex shedding from the cylinder at supercritical Reynolds numbers, which is consistent with previous results of heating on the whole surface of the cylinder. However, as the lateral sides of the cylinder (perpendicular to the stream-wise direction) are heated, an adverse effect is found for the first time in that the flow is destabilized and vortex shedding can be excited at subcritical Reynolds numbers. As the lateral sides of the cylinder are cooled, the flow is stabilized. 展开更多
关键词 fluid dynamics Mathematical physics
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Active Mixing in a Microchannel 被引量:1
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作者 郭春海 谭俊杰 +2 位作者 任登凤 张玉成 王福华 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第11期144-147,共4页
We investigate a minute magneto hydro-dynamic mixer with relatively rapid mixing enhancement experimentally and analytically. The mixer is fabricated with brass and polymethyl methacrylate (PMMA) layers. A secondary... We investigate a minute magneto hydro-dynamic mixer with relatively rapid mixing enhancement experimentally and analytically. The mixer is fabricated with brass and polymethyl methacrylate (PMMA) layers. A secondary flow is generated by using the Lorentz force in the fluids. The efficiency of mixing is greatly improved due to the large increase of the contact area between two mixing fluids. The micro particle image velocimetry technique is employed to measure the fluid flow characteristics in the micro-channel. Numerical simulation is performed based on the theoretical model of the computational fluid dynamics and the electromagnetic field theory. The experimental results are in good agreement with the numerical results, which indicates that the mixing area is enlarged by the driving of Lorentz force and the mixing can be enhanced. 展开更多
关键词 fluid dynamics Computational physics Nanoscale science and low-D systems
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Role of Viscosity Stratification and Insoluble Surfactant in Instability of Two-Layer Channel Flow
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作者 彭杰 朱克勤 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期175-177,共3页
We study, for the case of the two layer plane Poiseuille flow, the effect of viscosity stratification and interracial surfactant on the flow instability. Considering a normal mode of the streamwise wave number α, bot... We study, for the case of the two layer plane Poiseuille flow, the effect of viscosity stratification and interracial surfactant on the flow instability. Considering a normal mode of the streamwise wave number α, both the linear and energy analyses are presented. The expressions of perturbation energy supplied at the interface are derived. The result demonstrates that the jumps of horizontal velocity and tangential stress of the perturbed flow across the interface could be induced by the presence of viscosity stratification and surfactant. This is expected to be responsible for the Yih and Marangoni instability. 展开更多
关键词 fluid dynamics Mathematical physics
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Statistical Analysis of the Random Convective Dispersion Models
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作者 吴景春 覃生高 吕孝明 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期200-203,共4页
The convective dispersion models are derived by the material balance method in an infinitesimal volume. In comparison with the derivation process by the Markov method, they indicate statistical foundation of random pa... The convective dispersion models are derived by the material balance method in an infinitesimal volume. In comparison with the derivation process by the Markov method, they indicate statistical foundation of random particle movement. By numerical method, the mass transport laws are analyzed comparatively for the models. 展开更多
关键词 fluid dynamics Mathematical physics
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Relaxation Oscillation of Thermal Convection in Rotating Cylindrical Annulus
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作者 陶建军 谭文长 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期220-223,共4页
Chaotic thermal convection in a rapidly rotating cylindrical annulus is investigated numerically and the relaxation oscillation state is obtained under the no-slip boundary condition. The dominant frequency of the osc... Chaotic thermal convection in a rapidly rotating cylindrical annulus is investigated numerically and the relaxation oscillation state is obtained under the no-slip boundary condition. The dominant frequency of the oscillation is inherited directly from a vacillating mode, whose nonlinear interaction with another high-frequency vacillating mode leads to the chaotic state at high Rayleigh numbers through an RTN-type route. Furthermore, the effects of Coriolis parameter and Rayleigh number on the quasi-periodic burst of kinetic energy are discussed as well. 展开更多
关键词 fluid dynamics Statistical physics and nonlinear systems
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