HOME→The reason for the instability of the vertical abrasive layer, sometimes accompanied by strong impact sound
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The reason for the instability of the vertical abrasive layer, sometimes accompanied by strong impact sound
Influence of the abrasive shapeposition characteristic
2023年12月13日 Grinding is a generally utilized method, removing excess materials through effective abrasives The grinding abrasives with multiple shapeposition characteristics play a dominant role in determining the thermo 2022年2月1日 This study provides an analysis of the neutral stability condition and of the threshold to absolute instability in a vertical porous channel with isothermal sidewalls kept at Modal and absolute thermal instability in a vertical porous layer2023年8月23日 Since the boundary layer mainly hinders the abrasive movement, the abrasive velocity value with a velocity gradient of 0 before entering the boundary layer is selected as Investigation on abrasivewall collision mechanism and the 2021年9月1日 The abrasive grinding hardening is not only a high precision material removal process, but also generates metamorphic layers to improve surface strength, which is affected Grain refinement mechanism of metamorphic layers by abrasive
Abrasive machining induced surface layer damage behavior and
2023年12月1日 In this study, we subjected βGa 2 O 3 to deformation using nanoindentation and nanogrinding techniques under gradient loads and various grinding conditions The 2024年7月6日 A controlled Klebanofftype transition is initiated by imposed unstable second modes and oblique waves on the domain inlet The mean flow results indicate that BFS cause Effects of surface imperfections on the boundary layer stability in a 2020年3月31日 When inplane compression in an initially flat structure reaches a certain extent due to mechanical loading, thermal expansion mismatch, or chemical reactions, wrinkling Instabilities of Thin Films on a Compliant Substrate: Direct Nature2023年4月1日 American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 201915807 7032647500Groove Coating's Effect on Linear and Nonlinear Instability of High
Rayleigh–Taylor instabilities with anisotropic lithospheric viscosity
2008年6月1日 Our results demonstrate a dramatic effect of AV on the development of instabilities—their timing, location, and, most notably, their wavelength are strongly affected by In this study, we construct a statistical grinding theory that considers the effect of abrasive grain distribution and improves the accuracy of the theoretical analysis of the ground surface Effect of the Abrasive Grain Distribution on Ground Surface 2024年1月20日 Abrasive belt grinding is widely used for difficulttomachine materials [1,2,3,4], surface allowance removal from curved parts [], and performance enhancement owing to its elastic grinding ability and other beneficial machining properties []However, because of the contact elasticity, random direction of the cutting edge, and height distribution of abrasive Comprehensive analysis of the effects of different parameters on 2014年3月1日 The convective instability of a vertical thermal boundary layer adjacent to the sidewall of a waterfilled differentially heated cavity over a range of Rayleigh numbers (5 × 10 7 –344 × 10 9) is investigated using direct stability analysisThe results show that the dominant frequency of the convective instability changes as perturbations travel downstream due to the Convective instability of a vertical thermal boundary layer in a
Linear instability of the vertical throughflow in a horizontal
2016年8月1日 The aim of this paper is to extend the classical analysis of the onset of convective instability in a horizontal porous layer with vertical throughflow to a nonNewtonian fluid of the powerlaw type We mention that a similar analysis has been carried out for a viscoelastic fluid in a couple of papers by Shivakumara and Sureshkumar [31], [32]2014年11月1日 Horizontal roll vortices, or rolls, are frequently observed in the hurricane boundary layer (HBL) Previous studies suggest that these rolls can be generated by the inflection point instability of On the Generation of Roll Vortices due to the Inflection Point 2015年8月14日 The choice of a 2D domain is motivated by the associated reduction of computational time and is justified at moderate gas velocity by the 2D nature of the waves at their onsetInfluence of Gas Turbulence on the Instability of an AirWater Mixing Layer2007年9月1日 The restratification of the oceanic surface mixed layer that results from lateral gradients in the surface density field is studied The lateral gradients are shown to be unstable to ageostrophic (PDF) Mixed Layer Instabilities and Restratification
Centrifugal and Symmetric Instability during Ekman Adjustment
2020年5月12日 layer outside an entrainment layer near the boundary layer top, such that h ≈ H / (1 + α) An 332 example of this latter case is shown in figure 11 for simulation CONV 1, where L s / H 1, and 333Abstract Tropical cyclone (TC) structure and intensity are strongly modulated by interactions with deeplayer vertical wind shear (VWS)—the vector difference between horizontal winds at 200 and 850 hPa This paper presents a comprehensive review of more than a century of research on TC–VWS interactions The literature broadly agrees that a TC vortex becomes vertically tilted, A Review of the Interactions between Tropical Cyclones and 2024年7月22日 We consider an infinitely tall vertical layer of Brinkman porous slab with width 2d (Fig 1)The isothermal and impermeable channel walls, x = d and x = − d, are kept at different temperatures, T 1 and T 2 (T 2 > T 1), and different solute concentrations S 1 and S 2 (S 2 > S 1)A twodimensional flow occurs in the (x, z)plane, with the yaxis perpendicular to this planeInstability of doublediffusive natural convection in a vertical 2019年12月11日 In view of the defects such as material bonding, work hardening, and tensile residual stress on the ground surface due to excessive temperature during grinding of superalloys, an internalcooling grooved grinding wheel was designed and fabricated Several abrasive patterns with different geometries (random, oblique, circular staggered, and diamond Performance of the internalcooling grooved grinding wheel with
A stateoftheart review of vertical ground motion (VGM
2021年3月28日 Previous earthquake events have shown that the vertical component of strong ground motion has been proved to damage or totally destroy the structures But in seismic resistant design of structures, effects of horizontal ground motions are mainly considered and effects of vertical ground motions (VGMs) are ignored However, the field evidence of 2013年11月1日 Abstract A new theory of shear instability in a turbulent environment is applied to eight days of velocity and density profiles from the upperequatorial Pacific This period featured a regular diurnal cycle of surface forcing, together with a clear response in upperocean mixing During the day, a layer of stable stratification and shear forms at the surface During late Diurnal Shear Instability, the Descent of the Surface Shear Layer2019年7月23日 1 Introduction Oceanic fronts are known to be hot spots for biological activity They facilitate the vertical supply of nutrients for phytoplankton production (Lévy et al, 2001; Lévy, 2003; Mahadevan Archer, 2000; Effects of Oceanic Mesoscale and Submesoscale instability The critical layer is a \nearsinglularity" that can develop at the location where the background ow speed is equal to the instability phase speed We use an approximation at the critical layer based on a slowly varying vertical velocity, and a rapidly varying vorticity to formulate a new vortex sheet representation of the critical Understanding critical layers in stratified shear flow instabilities
(PDF) The Concentration’s Influence of the Abrasive Granules
Three different abrasive sizes, 45 μm, 175 μm and 180 μm, were used in a modified ASTM G65 rubber wheel abrasion test to examine the effects of abrasive size on wear in a sintered WC and a D vertical wind shear in a tropopauserelative vertical coordinate, derived from radiosonde measurements taken at Boise, Idaho (43:6 N, 116:2 W) The meridional dependency of strong vertical wind shear near the tropopause was analyzed byZhang et al(2019), based on 13 years of radiosonde measurements at 90 stations in the Northern HemisphereOn the occurrence of strong vertical wind shear in the 2022年2月1日 The conduction regime in a vertical porous layer subject to a horizontal temperature gradient is studied The boundaries are considered as isothermal, with different temperatures, and permeable to Modal and absolute thermal instability in a vertical porous layer2019年10月18日 This paper bypasses the mathematical technicalities of baroclinic instability and tries to provide a more conceptual, mechanistic explanation for a phenomenon that is fundamentally important to the dynamics of the earth’s atmosphere and oceans The standard conceptual picture of baroclinic instability is reviewed and stripped down to identify the most Balancing the Potential Vorticity Seesaw: The Bare Essentials of
The sliding instability of rock roof block induced by vertical
2021年7月1日 The dynamic disturbance is one of the major reasons to trigger rock block sliding along the discontinuities of roof rock mass during the mining excavation2016年11月19日 Here, we explore the transition from symmetric instability to ageostrophic baroclinic instability in the Eady model; an idealised representation of a submesoscale mixed layer front We revisit the linear stability problem considered by Stone (J Atmos Sci, 23, 390–400, (Stone 1966)), Stone (J Atmos Sci, 27, 721–726, (Stone 1970)), Stone (J Atmos Sci, 29, The transition from symmetric to baroclinic instability in the 2022年11月7日 Instability failures of lockedsegmenttype slopes are famous for their high startup speed, strong suddenness, and serious harm Therefore, research concerning the instability mechanism and reasonable instability prediction model of such slopes is urgently needed The Chana landslide is chosen as an example of a typical lockedsegmenttype slope, and its The unlocked mechanism and instability prediction of a typical 2023年10月4日 For strong fronts, a turbulent layer develops, but this layer is not an ML in the traditional sense because it is characterized by persistent horizontal and vertical gradients in densityVertical Exchange Induced by MixedLayer Instabilities
Finiteamplitude instability of the buoyancy boundary layer in a
The results show that only supercritical instability exists, which is consistent with the conclusion based on direct numerical simulation (Chen Chung Reference Chen and Chung 2002, Reference Chen and Chung 2003) Up to now, there has been little research on nonlinear analysis of the buoyancy layer on a vertical plate in a stratified medium2020年10月7日 According to the accident analysis of vehicles in the curve, the skidding, rollover, and lateral drift of vehicles are determined as means to evaluate the lateral stability of vehiclesStudy on the Influence of Road Geometry on Vehicle Lateral Instabilitythe ocean bottom These modes are low vertical mode baroclinic instabilities and are the source of the oceanic mesoscale eddy field These instabilities are known to exert a strong influence on the rate of lateral spreading of tracers in the upper ocean 2) Shallow MLIs: The second class of instability is composed of smaller modes, 200 m–20 Mixed Layer Instabilities and Restratification2019年10月21日 Expensive diamond grains remaining within waste diamond grinding wheels and wheel substrate need to be recycled Electroplated diamond grinding wheel was taken as an example An idea of “substrate structureinduced cracks (SSIC)” was proposed to solve the disassembly problem of waste electroplated diamond wheels An assembled substrate for Design of assembled substrate of electroplated diamond grinding
Stability of doublediffusive natural convection in a vertical fluid layer
2021年9月1日 A nonlinear instability analysis of triple diffusive convection under the timedependent heat and mass transfer boundary conditions in the presence of internal heat source is evaluated in this study2011年1月1日 where \( D\prime = D\cos \beta \) is the thickness of the object and D is the vertical projection of the thickness (Fig 21)The stress is measured in pascals (Pa) 212 Friction 2121 Basic Laws of Friction The friction force is universally present in everyday life The very actions of walking, running, or driving a car are possible because friction acts between the Friction, Cohesion, and Slope Stability SpringerLinkVertical Exchange Induced by Mixed Layer Instabilities YANGCHENG LUO a,b AND JÖRN CALLIESa a Division ofGeologicaland PlanetarySciences, California InstituteofTechnology, Pasadena,California b LMD/IPSL,SorbonneUniversité,ENS, PSL, ÉcolePolytechnique,Institut PolytechniquedeParis,CNRS,Paris, France (Manuscript received 4 April 2023, in final form 26 Vertical Exchange Induced by Mixed Layer Instabilities Ocean A wide range of scales are energized through a turbulent inverse cascade of kinetic energy that is fuelled by the submesoscale mixedlayer instability Major differences to mesoscaledriven surface frontogenesis are that mixedlayer instabilities energize the entire depth of the mixed layer and produce larger vertical velocitiesThe role of mixedlayer instabilities in submesoscale turbulence
(PDF) Faraday instability of a twolayer liquid film
2016年6月7日 Positive part of the growth rate Re(λ) vs k for a RayleighTaylor unstable twolayer liquid film The two liquids in Fig 2 are interchanged with the film thicknesses d1=5 mm and d2=6 mm and σ2 instability were initiated by Vest and Arpaci (1969) and by Gill and Davey (1969)for clear fluids Further developments were achieved by McBain and Armfield (2004) In his pioneering paper, Gill (1969) proved that this instability is prevented whenever the fluid saturates a vertical porous layer bounded by impermeable walls, and where Darcy Local Thermal Nonequilibrium Analysis of the Instability in a Vertical 2021年8月1日 One is that the ILH is generally higher than the height of boundary layers This is due to the aerosols cannot break through the IL in the vertical direction in most cases, and the IL exists at Is the atmospheric boundary layer altitude or the strong 2018年5月1日 The paper presents the analysis of the impact of vertical periodic vibrations on the longwavelength Marangoni instability in a liquid layer with poorly conducting boundaries in the presence of Parametric Excitation of Marangoni Instability in a Heated Thin Layer
Influence of localised smooth steps on the instability of a boundary layer
12 Problem definition The smooth step considered in this paper, illustrated in figure 1, is located in the unstable regime of the neutral stability curve close to the leading edgeIn the following study we consider mediumfrequency and frequencies ${\mathcal{F}}\in \{100,140,150,160\}$ 2D TS waves but also investigate a lowfrequency case with forcing ${\mathcal{F}}=4934$ for 2007年11月1日 Thus the thinlayer lubrication effect is lost due to the presence of the free surface, and inertialess instability occurs The reason for the loss of the lubrication effect and the mechanism of Effect of surfactants on the inertialess instability of a twolayer Study with Quizlet and memorize flashcards containing terms like Proper finishing, polishing, and cleaning of tooth structures and restorative materials of the restorative material 1 improves the esthetics 2 improves the tissue health 3 increases the longevity a 1, 2, 3 b 1, 2 c 1, 3 d 2, 3, Which of the following scales ranks materials by their relative resistance to abrasion?DM Chapter 13 Abrasion, Finishing, and Polishing Flashcards2007年12月1日 Wellbore instability is one of the main problems that engineers meet during drilling The causes of wellbore instability are often classified into either mechanical (for example, failure of the Wellbore instability: Causes and consequences ResearchGate
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Google's service, offered free of charge, instantly translates words, phrases, and web pages between English and over 100 other languages2022年8月1日 The vertical transport of heat, momentum, carbon, oxygen, and other tracers within the mixed layer depends on many physical processes such as winddriven inertial oscillations (Asselin and Young, 2020), Langmuir turbulence (McWilliams and Sullivan, 2000; Chor et al, 2021), winddriven reductions in stability (Thomas et al, 2008), convective Impact of symmetric instability parametrization scheme on the