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Articoli di riviste sul tema "Viscous"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 18 maggio 2024

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1

Adhikari, Sondipon. "Qualitative dynamic characteristics of a non-viscously damped oscillator". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, n. 2059 (16 giugno 2005): 2269–88. http://dx.doi.org/10.1098/rspa.2005.1485.

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This paper considers the linear dynamics of a single-degree-of-freedom non-viscously damped oscillator. It is assumed that the non-viscous damping force depends on the history of velocity via a convolution integral over an exponentially decaying kernel function. Classical qualitative dynamic properties known for viscously damped oscillators have been generalized to such non-viscously damped oscillators. The following questions of fundamental interest have been addressed: (i) under what conditions can a non-viscously damped oscillator sustain oscillatory motions? (ii) how does the natural frequency of a non-viscously damped oscillator compare with that of an equivalent undamped oscillator? and (iii) how does the decay rate compare with that of an equivalent viscously damped oscillator? Introducing two non-dimensional factors, namely, the viscous damping factor and the non-viscous damping factor, we provide answers to these questions. Wherever possible, attempts are made to relate the new results with equivalent classical results for a viscously damped oscillator.

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2

Kang, Jae-Hoon. "Closed-Form Exact Solutions for Viscously Damped Free and Forced Vibrations of Longitudinal and Torsional Bars". International Journal of Structural Stability and Dynamics 17, n. 08 (ottobre 2017): 1750093. http://dx.doi.org/10.1142/s0219455417500936.

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This paper studies the viscously damped free and forced vibrations of longitudinal and torsional bars. The method is exact and yields closed form solution for the vibration displacement in contrast with the well-known eigenfunction superposition (ES) method, which requires expression of the distributed forcing functions and displacement response functions as infinite series sums of free vibration eigenfunctions. The viscously damped natural frequency equation and the critical viscous damping equation are exactly derived for the bars. Then the viscously damped free vibration frequencies and corresponding damped mode shapes are calculated and plotted, aside from the undamped free vibration and corresponding mode shapes typically computed and used in vibration problems. The longitudinal or torsional amplitude versus forcing frequency curves showing the forced response to distributed loadings are plotted for various viscous damping parameters. It is found that the viscous damping affects the natural frequencies and the corresponding mode shapes of longitudinal and torsional bars, especially for the fundamental frequency.

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3

Irklei, V. M., G. I. Berestyuk e K. Ya Reznik. "Filtration of highly-viscous viscoses at elevated temperatures". Fibre Chemistry 18, n. 2 (1986): 111–13. http://dx.doi.org/10.1007/bf00549625.

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4

Coclici, Cristian, Gheorghe Moroşanu e Wolfgang L. Wendland. "On the viscous–viscous and the viscous–inviscid interactions in Computational Fluid Dynamics". Computing and Visualization in Science 2, n. 2-3 (dicembre 1999): 95–105. http://dx.doi.org/10.1007/s007910050032.

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5

Persaud, Donny, Josh Lepawsky e Max Liboiron. "« Viscous objects »". Techniques & culture, n. 72 (25 novembre 2019): 126–29. http://dx.doi.org/10.4000/tc.12504.

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6

Muronga, Azwinndini. "Viscous hydrodynamics". Journal of Physics G: Nuclear and Particle Physics 31, n. 6 (23 maggio 2005): S1035—S1039. http://dx.doi.org/10.1088/0954-3899/31/6/053.

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7

Bravo Medina, Sergio, Marek Nowakowski e Davide Batic. "Viscous cosmologies". Classical and Quantum Gravity 36, n. 21 (10 ottobre 2019): 215002. http://dx.doi.org/10.1088/1361-6382/ab45bb.

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8

John Newman. "Viscous Sublayer". Russian Journal of Electrochemistry 56, n. 3 (marzo 2020): 263–69. http://dx.doi.org/10.1134/s102319352003009x.

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9

Le Goff, Anne, David Quéré e Christophe Clanet. "Viscous cavities". Physics of Fluids 25, n. 4 (aprile 2013): 043101. http://dx.doi.org/10.1063/1.4797499.

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10

Jha, Aditya, Pierre Chantelot, Christophe Clanet e David Quéré. "Viscous bouncing". Soft Matter 16, n. 31 (2020): 7270–73. http://dx.doi.org/10.1039/d0sm00955e.

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11

Miller, Ross, e Cathie Searle. "Viscous cyclopentolate". Australian and New Zealand Journal of Ophthalmology 18, n. 4 (novembre 1990): 437–38. http://dx.doi.org/10.1111/j.1442-9071.1988.tb01223.x-i1.

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12

Radner, Roy. "Viscous demand". Journal of Economic Theory 112, n. 2 (ottobre 2003): 189–231. http://dx.doi.org/10.1016/s0022-0531(03)00115-7.

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13

Wuttke, J., I. Chang, F. Fujara e W. Petry. "Viscous glycerol". Physica B: Condensed Matter 234-236 (giugno 1997): 431–32. http://dx.doi.org/10.1016/s0921-4526(96)01000-9.

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14

Leighton, David, e Andreas Acrivos. "Viscous resuspension". Chemical Engineering Science 41, n. 6 (1986): 1377–84. http://dx.doi.org/10.1016/0009-2509(86)85225-3.

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15

Padmanabhan, T., e S. M. Chitre. "Viscous universes". Physics Letters A 120, n. 9 (marzo 1987): 433–36. http://dx.doi.org/10.1016/0375-9601(87)90104-6.

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16

Serra, Jean. "Viscous Lattices". Journal of Mathematical Imaging and Vision 22, n. 2-3 (maggio 2005): 269–82. http://dx.doi.org/10.1007/s10851-005-4894-2.

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17

Parizot, Cédric. "Viscous Spatialities". South Atlantic Quarterly 117, n. 1 (1 gennaio 2018): 21–42. http://dx.doi.org/10.1215/00382876-4282028.

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18

Ke, G., e T. Hashimoto. "Viscous expander". Cryogenics 34, n. 1 (gennaio 1994): 9–18. http://dx.doi.org/10.1016/0011-2275(94)90046-9.

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19

Durbin, Stephen M. "Combined demonstration of non-viscous and viscous flow". American Journal of Physics 87, n. 4 (aprile 2019): 305–9. http://dx.doi.org/10.1119/1.5086010.

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20

John, M. O., R. M. Oliveira, F. H. C. Heussler e E. Meiburg. "Variable density and viscosity, miscible displacements in horizontal Hele-Shaw cells. Part 2. Nonlinear simulations". Journal of Fluid Mechanics 721 (13 marzo 2013): 295–323. http://dx.doi.org/10.1017/jfm.2013.64.

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AbstractDirect numerical simulations of the variable density and viscosity Navier–Stokes equations are employed, in order to explore three-dimensional effects within miscible displacements in horizontal Hele-Shaw cells. These simulations identify a number of mechanisms concerning the interaction of viscous fingering with a spanwise Rayleigh–Taylor instability. The dominant wavelength of the Rayleigh–Taylor instability along the upper, gravitationally unstable side of the interface generally is shorter than that of the fingering instability. This results in the formation of plumes of the more viscous resident fluid not only in between neighbouring viscous fingers, but also along the centre of fingers, thereby destroying their shoulders and splitting them longitudinally. The streamwise vorticity dipoles forming as a result of the spanwise Rayleigh–Taylor instability place viscous resident fluid in between regions of less viscous, injected fluid, thereby resulting in the formation of gapwise vorticity via the traditional, gap-averaged viscous fingering mechanism. This leads to a strong spatial correlation of both vorticity components. For stronger density contrasts, the streamwise vorticity component increases, while the gapwise component is reduced, thus indicating a transition from viscously dominated to gravitationally dominated displacements. Gap-averaged, time-dependent concentration profiles show that variable density displacement fronts propagate more slowly than their constant density counterparts. This indicates that the gravitational mixing results in a more complete expulsion of the resident fluid from the Hele-Shaw cell. This observation may be of interest in the context of enhanced oil recovery or carbon sequestration applications.

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21

Trapman, L., G. Rosotti, A. D. Bosman, M. R. Hogerheijde e E. F. van Dishoeck. "Observed sizes of planet-forming disks trace viscous spreading". Astronomy & Astrophysics 640 (28 luglio 2020): A5. http://dx.doi.org/10.1051/0004-6361/202037673.

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Context. The evolution of protoplanetary disks is dominated by the conservation of angular momentum, where the accretion of material onto the central star is fed by the viscous expansion of the outer disk or by disk winds extracting angular momentum without changing the disk size. Studying the time evolution of disk sizes therefore allows us to distinguish between viscous stresses or disk winds as the main mechanism of disk evolution. Observationally, estimates of the size of the gaseous disk are based on the extent of CO submillimeter rotational emission, which is also affected by the changing physical and chemical conditions in the disk during the evolution. Aims. We study how the gas outer radius measured from the extent of the CO emission changes with time in a viscously expanding disk. We also investigate to what degree this observable gas outer radius is a suitable tracer of viscous spreading and whether current observations are consistent with viscous evolution. Methods. For a set of observationally informed initial conditions we calculated the viscously evolved density structure at several disk ages and used the thermochemical code DALI to compute synthetic emission maps, from which we measured gas outer radii in a similar fashion as observations. Results. The gas outer radii (RCO, 90%) measured from our models match the expectations of a viscously spreading disk: RCO, 90% increases with time and, for a given time, RCO, 90% is larger for a disk with a higher viscosity αvisc. However, in the extreme case in which the disk mass is low (Mdisk ≤ 10−4 M⊙) and αvisc is high (≥10−2), RCO, 90% instead decreases with time as a result of CO photodissociation in the outer disk. For most disk ages, RCO, 90% is up to ~12× larger than the characteristic size Rc of the disk, and RCO, 90%/Rc is largest for the most massive disk. As a result of this difference, a simple conversion of RCO, 90% to αvisc overestimates the true αvisc of the disk by up to an order of magnitude. Based on our models, we find that most observed gas outer radii in Lupus can be explained using viscously evolving disks that start out small (Rc(t = 0) ≃ 10 AU) and have a low viscosity (αvisc = 10−4−10−3). Conclusions. Current observations are consistent with viscous evolution, but expanding the sample of observed gas disk sizes to star-forming regions, both younger and older, would better constrain the importance of viscous spreading during disk evolution.

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22

Foken, Thomas. "Some aspects of the viscous sublayer". Meteorologische Zeitschrift 11, n. 4 (30 ottobre 2002): 267–72. http://dx.doi.org/10.1127/0941-2948/2002/0011-0267.

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23

Bayazitoglu, Y., e P. V. R. Suryanarayana. "Dynamics of oscillating viscous droplets immersed in viscous media". Acta Mechanica 95, n. 1-4 (marzo 1992): 167–83. http://dx.doi.org/10.1007/bf01170811.

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24

Brochard-Wyart, F., G. Debrégeas e P. G. de Gennes. "Spreading of viscous droplets on a non viscous liquid". Colloid and Polymer Science 274, n. 1 (gennaio 1996): 70–72. http://dx.doi.org/10.1007/bf00658911.

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25

Herreman, W., C. Nore, J. L. Guermond, L. Cappanera, N. Weber e G. M. Horstmann. "Perturbation theory for metal pad roll instability in cylindrical reduction cells". Journal of Fluid Mechanics 878 (18 settembre 2019): 598–646. http://dx.doi.org/10.1017/jfm.2019.642.

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We propose a new theoretical model for metal pad roll instability in idealized cylindrical reduction cells. In addition to the usual destabilizing effects, we model viscous and Joule dissipation and some capillary effects. The resulting explicit formulas are used as theoretical benchmarks for two multiphase magnetohydrodynamic solvers, OpenFOAM and SFEMaNS. Our explicit formula for the viscous damping rate of gravity waves in cylinders with two fluid layers compares excellently to experimental measurements. We use our model to locate the viscously controlled instability threshold in cylindrical shallow reduction cells but also in Mg–Sb liquid metal batteries with decoupled interfaces.

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26

Pegler, Samuel S., e M. Grae Worster. "Dynamics of a viscous layer flowing radially over an inviscid ocean". Journal of Fluid Mechanics 696 (9 marzo 2012): 152–74. http://dx.doi.org/10.1017/jfm.2012.21.

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AbstractWe present a theoretical and experimental study of a viscous fluid layer spreading over a deep layer of denser, inviscid fluid. Specifically, we study an axisymmetric flow produced by a vertical line source. Close to the source, the flow is controlled viscously, with a balance between radial compressive stresses and hoop stresses. Further out, the flow is driven by gradients in the buoyancy force and is resisted by viscous extensional and hoop stresses. An understanding of these different fluid-mechanical relationships is developed by asymptotic analyses for early times and for the near and far fields at late times. Confirmation of the late-time, far-field behaviour is obtained from a series of laboratory experiments in which golden syrup was injected into denser solutions of potassium carbonate. We use our mathematical solutions to discuss a physical mechanism by which horizontal viscous stresses in a spreading ice shelf, such as those in West Antarctica, can buttress the grounded ice sheet that supplies it.

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27

Safronov, A. A., A. A. Koroteev, N. I. Filatov e N. A. Safronova. "Capillary Hydraulic Jump in a Viscous Jet". Nelineinaya Dinamika 15, n. 3 (2019): 221–31. http://dx.doi.org/10.20537/nd190302.

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28

Song, Yiyun. "A viscous switch". Nature Chemical Biology 17, n. 12 (19 novembre 2021): 1211. http://dx.doi.org/10.1038/s41589-021-00943-y.

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29

McNeil, Brian, e Linda M. Harvey. "Viscous Fermentation Products". Critical Reviews in Biotechnology 13, n. 4 (gennaio 1993): 275–304. http://dx.doi.org/10.3109/07388559309075699.

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30

Matson, Gary P., e Andrew J. Hogg. "Viscous exchange flows". Physics of Fluids 24, n. 2 (febbraio 2012): 023102. http://dx.doi.org/10.1063/1.3685723.

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31

Polini, Marco, e Andre K. Geim. "Viscous electron fluids". Physics Today 73, n. 6 (1 giugno 2020): 28–34. http://dx.doi.org/10.1063/pt.3.4497.

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32

Batty, Christopher, Andres Uribe, Basile Audoly e Eitan Grinspun. "Discrete viscous sheets". ACM Transactions on Graphics 31, n. 4 (5 agosto 2012): 1–7. http://dx.doi.org/10.1145/2185520.2185609.

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33

Powles, Jack G., Gerald Rickayzen e David M. Heyes. "Purely viscous fluids". Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 455, n. 1990 (8 ottobre 1999): 3725–42. http://dx.doi.org/10.1098/rspa.1999.0474.

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34

GARCíA-RUIZ, J. M. "'Peacock' viscous fingers". Nature 356, n. 6365 (marzo 1992): 113. http://dx.doi.org/10.1038/356113a0.

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35

Coley, A. A., R. J. van den Hoogen e R. Maartens. "Qualitative viscous cosmology". Physical Review D 54, n. 2 (15 luglio 1996): 1393–97. http://dx.doi.org/10.1103/physrevd.54.1393.

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36

Nečas, J., e M. Šilhavý. "Multipolar viscous fluids". Quarterly of Applied Mathematics 49, n. 2 (1 gennaio 1991): 247–65. http://dx.doi.org/10.1090/qam/1106391.

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37

Koulakis, John P., e Catalin D. Mitescu. "The viscous catenary". Physics of Fluids 19, n. 9 (settembre 2007): 091103. http://dx.doi.org/10.1063/1.2775166.

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38

Shtarkman, Emile M. "Viscous spring damper". Journal of the Acoustical Society of America 80, n. 3 (settembre 1986): 997. http://dx.doi.org/10.1121/1.393873.

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39

Coad, L. Dale. "Viscous spring damper". Journal of the Acoustical Society of America 80, n. 4 (ottobre 1986): 1279. http://dx.doi.org/10.1121/1.394445.

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40

TEICHMAN, J., e L. MAHADEVAN. "The viscous catenary". Journal of Fluid Mechanics 478 (10 marzo 2003): 71–80. http://dx.doi.org/10.1017/s0022112002003038.

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A filament of an incompressible highly viscous fluid that is supported at its ends sags under the influence of gravity. Its instantaneous shape resembles that of a catenary, but evolves with time. At short times, the shape is dominated by bending deformations. At intermediate times, the effects of stretching become dominant everywhere except near the clamping boundaries where bending boundary layers persist. Finally, the filament breaks off in finite time via strain localization and pinch-off.

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41

JOSEPH, D. D. "Viscous potential flow". Journal of Fluid Mechanics 479 (25 marzo 2003): 191–97. http://dx.doi.org/10.1017/s0022112002003634.

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42

Zimdahl, Winfried. "Bulk viscous cosmology". Physical Review D 53, n. 10 (15 maggio 1996): 5483–93. http://dx.doi.org/10.1103/physrevd.53.5483.

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43

Bergou, Miklós, Basile Audoly, Etienne Vouga, Max Wardetzky e Eitan Grinspun. "Discrete viscous threads". ACM Transactions on Graphics 29, n. 4 (26 luglio 2010): 1–10. http://dx.doi.org/10.1145/1778765.1778853.

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44

SUN, CHANG-BO, JIA-LING WANG e XIN-ZHOU LI. "VISCOUS CARDASSIAN UNIVERSE". International Journal of Modern Physics D 18, n. 08 (agosto 2009): 1303–18. http://dx.doi.org/10.1142/s0218271809015102.

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The viscous Cardassian cosmology is discussed, assuming that there is a bulk viscosity in the cosmic fluid. The dynamical analysis indicates that there exists a singular curve in the phase diagram of the viscous Cardassian model. In the viscous PL model, the equation-of-state parameter wk is no longer a constant and it can cross the cosmological constant divide wΛ = -1, in contrast with the same problem of the ordinary PL model. Other models possess similar characteristics. For MP and exp models, wk evolves more near -1 than the case without viscosity. The bulk viscosity also affects the virialization process of a collapse system in the universe: R vir /R ta is increasingly large when the bulk viscosity is increasing. In other words, the bulk viscosity retards the progress of the collapse system. In addition, we fit the viscous Cardassian models to current type Ia supernova data and give the best fit value of the model parameters, including the bulk viscosity coefficient τ.

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45

Cantwell, Brian J. "Viscous starting jets". Journal of Fluid Mechanics 173 (dicembre 1986): 159–89. http://dx.doi.org/10.1017/s002211208600112x.

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This paper is concerned with the transient motion produced when a viscous incompressible fluid is forced from an initial state of rest. The applied force is time dependent in the form of an impulse, step and ramp function applied at a point and along a line. These cases have been chosen because they form a logical progression for investigating the connection between the flow Reynolds number and the sequence of events leading to the creation of a starting vortex. Much of the structure of the starting process can be revealed through a study of boundary conditions, integrals of the motion and the invariance properties of the governing equations prior to the consideration of a particular solution. The method used to bring out the flow structure is applicable to flows that can be treated as self-similar over some interval in time. The equations for unsteady particle paths are written in terms of similarity variables and then analysed as a quasi-autonomous system with the, usually time-dependent, Reynolds number treated as a parameter. The structure of the flow is examined by finding and classifying critical points in the phase portrait of this system. Bifurcations in the phase portrait are found to occur at specific values of the Reynolds number of the flow in question. When exact solutions of the Stokes equations for the low-Reynolds-number limit are examined they are found to contain two critical Reynolds numbers and three distinct states of motion which culminate in the onset of a vortex roll-up. An interesting feature of the Stokes solutions for planar unsteady jets is that they are uniformly valid over 0 < r < ∞.

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46

Ockendon, Hilary. "Viscous Fluid Flow". European Journal of Mechanics - B/Fluids 20, n. 1 (gennaio 2001): 157–58. http://dx.doi.org/10.1016/s0997-7546(00)01113-4.

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47

SAVVA, NIKOS, e JOHN W. M. BUSH. "Viscous sheet retraction". Journal of Fluid Mechanics 626 (10 maggio 2009): 211–40. http://dx.doi.org/10.1017/s0022112009005795.

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We present the results of a combined theoretical and numerical investigation of the rim-driven retraction of flat fluid sheets in both planar and circular geometries. Particular attention is given to the influence of the fluid viscosity on the evolution of the sheet and its bounding rim. In both geometries, after a transient that depends on the sheet viscosity and geometry, the film edge eventually attains the Taylor–Culick speed predicted on the basis of inviscid theory. The emergence of this result in the viscous limit is rationalized by consideration of both momentum and energy arguments. We first consider the planar geometry considered by Brenner & Gueyffier (Phys. Fluids, vol. 11, 1999, p. 737) and deduce new analytical expressions for the speed of the film edge at the onset of rupture and the evolution of the maximum film thickness for viscous films. In order to consider the expansion of a circular hole, we develop an appropriate lubrication model that predicts the form of the early stage dynamics of film rupture. Simulations of a broad range of flow parameters confirm the importance of geometry on the dynamics, verifying the exponential hole growth reported in early experimental studies. We demonstrate the sensitivity of the initial retraction speed on the film profile, and so suggest that the anomalous rate of retraction reported in these experiments may be attributed in part to geometric details of the puncture process.

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48

Kivotides, Demosthenes. "Viscous microdetonation physics". Physics Letters A 363, n. 5-6 (aprile 2007): 458–67. http://dx.doi.org/10.1016/j.physleta.2006.11.029.

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49

Hofbauer, LorenzC, e ArminE Heufelder. "Viscous hearing loss". Lancet 345, n. 8959 (maggio 1995): 1243. http://dx.doi.org/10.1016/s0140-6736(95)92027-7.

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50

SØrensen, Michael, Tine Tetzschner, Ole Ø. Rasmussen e John Christiansen. "Viscous fluid retention". Diseases of the Colon & Rectum 35, n. 4 (aprile 1992): 357–61. http://dx.doi.org/10.1007/bf02048114.

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