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Journal articles on the topic 'Isoviscose'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Rajagopalan, V., P. S. Goyal, B. S. Valaulikar, and B. A. Dasannacharya. "SANS by isoviscous micellar solutions." Physica B: Condensed Matter 180-181 (June 1992): 525–27. http://dx.doi.org/10.1016/0921-4526(92)90812-7.

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2

Thorey, Clement, and Chloé Michaut. "Elastic-plated gravity currents with a temperature-dependent viscosity." Journal of Fluid Mechanics 805 (September 16, 2016): 88–117. http://dx.doi.org/10.1017/jfm.2016.538.

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We develop a set of equations to explore the behaviour of cooling elastic-plated gravity currents for constant influx conditions. In particular, we introduce a temperature-dependent viscosity to couple the flow thermal structure with the velocity field. We show that this coupling results in important deviations from the isoviscous case. In particular, the bending and gravity asymptotic regimes, characteristic of the isoviscous case, both split into three different thermal phases: a first ‘hot’ isoviscous phase, a second phase where the spreading rate drastically decreases and the flow thickens and a third ‘cold’ isoviscous phase. The viscosity that controls the spreading rate differs in both asymptotic regimes; it is the average viscosity of a small peeling region at the current tip in the bending regime and the average flow viscosity in the gravity regime. In both regimes, we characterize the evolution of the thermal anomaly and determine the time scale of the phase changes in terms of the Péclet number and of the viscosity contrast. Finally, we show that the evolution with bending and gravity can result in six different evolution scenarios depending on the combination of dimensionless numbers considered. We provide a phase diagram which summarizes them as a function of the flow Péclet number and viscosity contrast.

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3

Shahrivar, K., E. M. Ortigosa-Moya, R. Hidalgo-Alvarez, and J. de Vicente. "Isoviscous elastohydrodynamic lubrication of inelastic Non-Newtonian fluids." Tribology International 140 (December 2019): 105707. http://dx.doi.org/10.1016/j.triboint.2019.03.065.

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4

Hooke, C. J. "The Minimum Film Thickness in Lubricated Line Contacts during a Reversal of Entrainment—Isoviscous Behaviour." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 206, no. 5 (September 1992): 337–45. http://dx.doi.org/10.1243/pime_proc_1992_206_136_02.

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In most line contacts, the film thickness can be adequately determined using a quasi-static analysis. The one exception appears to occur when the direction of entrainment changes. Here, the quasi-static approach predicts that the film will fall to zero while, in practice, there will always be a finite clearance between the surfaces. It was shown in a previous paper that this minimum clearance depends upon the rate of change of entrainment velocity, and limit expressions for the film thicknesses in the four regimes of lubrication were developed. The present paper examines the transition between the rigid-isoviscous and the elastic-isoviscous regimes and determines how the minimum film thickness behaves in this transition zone.

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5

Jang, Siyoul, and John Tichy. "Rheological Models for Thin Film EHL Contacts." Journal of Tribology 117, no. 1 (January 1, 1995): 22–28. http://dx.doi.org/10.1115/1.2830602.

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Rheological behavior in concentrated contacts has been studied extensively. In certain conditions such as a rough concentrated contact or sliding of nominally flat surfaces, films may be of molecular (nanometer) scale. The question arises as to whether the application of any viscous fluid model is appropriate. In this study, elastohydrodynamic lubrication analysis is performed on three candidate rheological models: (1) the classical case of viscosity variation with pressure, (2) an isoviscous model which idealizes porous layers on the solid surfaces representing the molecular microstructure, and (3) an isoviscous model which includes van der Waals and solvation surface forces. The latter two models predict behavior similar to classical behavior. The study is not sufficiently sensitive to determine which model best predicts experimental results, but some credence must be given to the latter two because experimental evidence suggests that Reynolds’ equation is not valid for molecularly thin films.

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6

Zhong, Shijie. "Dynamics of thermal plumes in three-dimensional isoviscous thermal convection." Geophysical Journal International 162, no. 1 (July 2005): 289–300. http://dx.doi.org/10.1111/j.1365-246x.2005.02633.x.

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7

Mahdavian, S. M., and Z. M. Shao. "Isoviscous Hydrodynamic Lubrication of Deep Drawing and Its Comparison With Experiment." Journal of Tribology 115, no. 1 (January 1, 1993): 111–18. http://dx.doi.org/10.1115/1.2920963.

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An analytical model for the isoviscous hydrodynamic lubrication of deep drawing is developed. The model covers the complete drawing stages from sheet metal blank to the drawn cup-shaped product. Equations to calculate the film thickness, radial, and drawing stresses related to the blank holder squeezing action are presented. Theoretical predictions of both film thickness and drawing force ratio for lubricated, low carbon steel are compared with experimental measurements.

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8

Hooke, C. J. "Calculation of Clearances in Soft Point Contacts." Journal of Tribology 110, no. 1 (January 1, 1988): 167–73. http://dx.doi.org/10.1115/1.3261558.

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The clearances in highly deformed contacts are formed in a narrow region on the upstream side, are convected through the contact with little change and emerge downstream where a restriction forms in a narrow exit zone. The paper describes how this behavior simplifies the lubrication analysis. Expressions for the minimum film thickness under point contacts are obtained for the elastic isoviscous regime.

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9

Hooke, C. J. "The Minimum Film Thickness in Lubricated Line Contacts during a Reversal of Entrainment—General Solution and the Development of a Design Chart." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 208, no. 1 (March 1994): 53–64. http://dx.doi.org/10.1243/pime_proc_1994_208_349_02.

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In most line contacts the load, effective radius of curvature and entraining velocity change with time. Generally this is ignored when calculating the film thickness and a quasi-steady solution is obtained. Under most conditions the errors introduced by this are either small or are not critical. However, when the entraining velocity reverses, as, for example, in some designs of cams, the quasi-steady approach predicts that the film thickness will be zero. In practice a residual film persists and can provide adequate surface separation. Previous papers by the author have shown that the minimum film thickness at entrainment reversal depends on the rate of change of the entraining velocity. Expressions for the film thickness in the four regimes of lubrication—rigid isoviscous, rigid piezoviscous, elastic isoviscous and elastic piezoviscous—were obtained and the variations of the film thickness in the transitions between adjacent regimes examined. The present paper examines the region where more than two regimes overlap. The values of film thickness obtained are then used to develop an interpolation procedure for the accurate calculation of the minimumfilm thickness under all operating conditions.

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10

Hooke, C. J. "The Elastohydrodynamic Lubrication of Elliptical Point Contacts Operating in the Isoviscous Region." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 4 (December 1995): 225–34. http://dx.doi.org/10.1243/pime_proc_1995_209_433_02.

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The elastohydrodynamic lubrication of point contacts is examined and results for the minimum film thickness are presented for a wide range of radius ratios and operating conditions. The results are compared with the predictions of the appropriate regime formulae. Although these formulae give a reasonable estimate of the contact's behaviour, the actual clearances are often substantially different, particularly close to the regime boundaries. Interpolation equations for seven values of radius ratio are given and these should be sufficient to allow the minimum clearance to be estimated for most isoviscous point contacts.

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11

Bombard, Antonio J. F., and Juan de Vicente. "Thin-Film Rheology and Tribology of Magnetorheological Fluids in Isoviscous-EHL Contacts." Tribology Letters 47, no. 1 (May 8, 2012): 149–62. http://dx.doi.org/10.1007/s11249-012-9971-2.

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12

Joneidi, A. A., C. V. Verhoosel, and P. D. Anderson. "Isogeometric boundary integral analysis of drops and inextensible membranes in isoviscous flow." Computers & Fluids 109 (March 2015): 49–66. http://dx.doi.org/10.1016/j.compfluid.2014.12.011.

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13

Huber, Markus, Ulrich Rüde, Christian Waluga, and Barbara Wohlmuth. "Surface Couplings for Subdomain-Wise Isoviscous Gradient Based Stokes Finite Element Discretizations." Journal of Scientific Computing 74, no. 2 (May 29, 2017): 895–919. http://dx.doi.org/10.1007/s10915-017-0470-3.

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14

Hall, R. W., and M. D. Savage. "Two-Dimensional Elastohydrodynamic Lubrication Part 2: Solution of the Line Contact Problem." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 5 (September 1988): 354–60. http://dx.doi.org/10.1243/pime_proc_1988_202_133_02.

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Following Part 1, this paper describes a method for solving the line contact problem in elastohydrodynamic lubrication. Using results derived in Part 1 together with the Reynolds lubrication equation and boundary conditions, an iterative scheme is designed so as to yield pressures, displacements and film thicknesses within a parabolic, lubricated contact. Converged numerical solutions are readily obtained over a parameter range which includes both isoviscous and weakly piezoviscous contacts.

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15

Jaffar, M. J. "Estimation of Minimum Thickness for Line Contacts in the Transition Region between the Isoviscous—Elastic and the Piezoviscous-Elastic Lubrication Regimes." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 203, no. 6 (November 1989): 379–86. http://dx.doi.org/10.1243/pime_proc_1989_203_131_02.

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This paper represents a solution for lubricated cylinders in line contact operating in the transition region between isoviscous-elastic and piezoviscous-elastic conditions. The computer solutions are used to generate a formula for the minimum film thickness. The approximate formula is compared with the existing formulae at the boundaries of the lubrication regimes where good agreement is obtained. Also, the influence of the starvation on pressure and film thickness is investigated.

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16

Myant, Connor, Mark Fowell, and Philippa Cann. "The effect of transient motion on Isoviscous-EHL films in compliant, point, contacts." Tribology International 72 (April 2014): 98–107. http://dx.doi.org/10.1016/j.triboint.2013.11.019.

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17

Pascovici, M. D., and I. Etsion. "The Accuracy of the Isoviscous Solution of the Reynolds Equation in Mechanical Seals." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 210, no. 2 (June 1996): 153–56. http://dx.doi.org/10.1243/pime_proc_1996_210_491_02.

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18

Fakes, Michael G., Arthur R. Mlodozeniec, and Gaylen M. Zentner. "Temperature-independent isoviscous effect in ternary systems of water, Tetronic 1307, and HEMA." Journal of Colloid and Interface Science 138, no. 2 (September 1990): 505–14. http://dx.doi.org/10.1016/0021-9797(90)90232-d.

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19

Chan, R. T. P., R. F. Martinez-Botas, and R. Gohar. "Isoviscous flow past a rigid sphere partially immersed in a thin oil film." Lubrication Science 19, no. 3 (2007): 197–212. http://dx.doi.org/10.1002/ls.42.

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20

Hamrock, B. J., Ping Pan, and Rong-Tsong Lee. "Pressure Spikes in Elastohydrodynamically Lubricated Conjunctions." Journal of Tribology 110, no. 2 (April 1, 1988): 279–84. http://dx.doi.org/10.1115/1.3261599.

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The film thickness, pressure, and flow in elastohydrodynamically lubricated conjunctions were calculated for a line contact. The main focus of the study was to get a better understanding of why a pressure spike exists in elastohydrodynamically lubricated conjunctions. Various combinations of viscous or isoviscous and compressible or incompressible situations were studied for a wide range of loads. The basic parameters were pressure, pressure gradient, film shape, and flow. It was found that the major factor causing the pressure spike to occur was the viscosity.

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21

Vilella, Kenny, and Frédéric Deschamps. "Temperature and heat flux scaling laws for isoviscous, infinite Prandtl number mixed heating convection." Geophysical Journal International 214, no. 1 (April 4, 2018): 265–81. http://dx.doi.org/10.1093/gji/ggy138.

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22

Weller, Matthew B., Adrian Lenardic, and William B. Moore. "Scaling relationships and physics for mixed heating convection in planetary interiors: Isoviscous spherical shells." Journal of Geophysical Research: Solid Earth 121, no. 10 (October 2016): 7598–617. http://dx.doi.org/10.1002/2016jb013247.

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23

Majumdar, B. C., D. E. Brewe, and M. M. Khonsari. "Stability of a Rigid Rotor Supported on Flexible Oil Journal Bearings." Journal of Tribology 110, no. 1 (January 1, 1988): 181–87. http://dx.doi.org/10.1115/1.3261562.

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This investigation deals with the stability characteristics of oil journal bearings, including the effect of elastic distortions in the bearing liner. Graphical results are presented for (1) steady-state load, (2) stiffness and damping coefficients, and (3) the stability. These results are given for various slenderness ratios, eccentricity ratios, and elasticity parameters. The lubricant is first assumed to be isoviscous. The analysis is then extended to the case of a pressure-dependent viscosity. It has been found that stability decreases with increase of the elasticity parameter of the bearing liner for heavily loaded bearings.

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24

Chen, Kuo-Kuang, and D. C. Sun. "Hydrodynamic Lubrication in Hemispherical Punch Stretch Forming." Journal of Applied Mechanics 53, no. 2 (June 1, 1986): 440–49. http://dx.doi.org/10.1115/1.3171778.

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The existence and consequence of hydrodynamic lubrication in sheet metal forming is demonstrated using a model problem of hemispherical punch stretch forming. The problem is solved by incorporating a lubrication analysis into an incremental plasticity analysis. The sheet material is assumed to be elastic plastic with strain hardening, and the lubricant is assumed isoviscous. The study identifies two dimensionless parameters controlling the condition of lubrication. The resulting variable friction at the punch-sheet interface is found to affect significantly the distribution of strains in the sheet metal and its formability.

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25

Mehenny, D. S., and C. M. Taylor. "Influence of circumferential waviness on engine bearing performance." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 214, no. 1 (January 1, 2000): 51–61. http://dx.doi.org/10.1243/0954406001522804.

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The influence of circumferential waviness of the journal on the lubrication of the inter-main bearing of an automotive engine is investigated using a theoretical analysis. The analysis is for two-dimensional thin film flow, with oil-film history. The bearing and shaft surfaces were assumed to be rigid and the lubricant isoviscous. The results show a significant influence of shaft lobing on predicted maximum film pressure and minimum film thickness, particularly as the number and size of lobes increase. It is concluded that, for satisfactory operation of engine bearings, circumferential form errors of the shaft need to be controlled.

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26

Wilson, W. R. D., and L. G. Hector. "Hydrodynamic Lubrication in Axisymmetric Stretch Forming—Part 1: Theoretical Analysis." Journal of Tribology 113, no. 4 (October 1, 1991): 659–66. http://dx.doi.org/10.1115/1.2920676.

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An improved theoretical model for the hydrodynamic lubrication of axisymmetric, sheet metal stretch forming is presented. The infinite initial film thickness problem, encountered in a previous model, is removed by accounting for the squeeze action occurring during the initial stages of the process. Both isoviscous and thermoviscous theories are developed assuming that the lubricant is a Newtonian fluid. In the thermoviscous model, the lubricant viscosity is assumed to vary exponentially with temperature. The influence of plastic heating of the sheet on the entrainment and transport of the lubricant film is examined. The effects of variable punch speed are also investigated.

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27

Bair, Scott. "An Experimental Verification of the Significance of the Reciprocal Asymptotic Isoviscous Pressure for EHD Lubricants." Tribology Transactions 36, no. 2 (January 1993): 153–62. http://dx.doi.org/10.1080/10402009308983144.

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28

Khatak, Pankaj, and HC Garg. "Investigation of the micropolar lubricant and thermal effects in the slot entry hybrid journal bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 11 (July 18, 2017): 2103–16. http://dx.doi.org/10.1177/0954406217713519.

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The present article studies the combined influence of the micropolar lubricant and thermal effects in the slot entry hybrid journal bearings. Bearing performance characteristics are computed by the concurrent solution of modified Reynolds, three-dimensional micropolar energy, and three-dimensional conduction equations. Thermohydrostatic characteristics of the slot entry hybrid journal bearings have been studied vis-à-vis isothermal characteristics. The results obtained numerically indicate that isoviscous assumption of the lubricant is incorrect and the bearing performance is significantly affected by the increase in temperature. Hence, it is essential to consider the thermal effects for the bearings operating with the micropolar lubricant for reliable performance analysis of the bearings.

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29

Scodinu, Alessandra, and John T. Fourkas. "Intermolecular Dynamics and Structure of Carbon Disulfide in Isoviscous Alkane Solutions: An Optical Kerr Effect Study." Journal of Physical Chemistry B 107, no. 1 (January 2003): 44–51. http://dx.doi.org/10.1021/jp026359m.

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30

Jalali- Vahid, D., Z. M. Jin, and D. Dowson. "Isoviscous elastohydrodynamic lubrication of circular point contacts with particular reference to metal-on-metal hip implants." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217, no. 5 (May 1, 2003): 397–402. http://dx.doi.org/10.1243/135065003322445313.

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A full numerical analysis of elastohydrodynamic lubrication (EHL) of circular point contacts was carried out in the present study under isoviscous conditions with particular reference to metal-on-metal artificial hip joints, using a modified Newton-Raphson method. It was found to be possible to incorporate directly the physiological conditions, representative of typical metal-on-metal hip implants under in-vivo walking or in-vitro simulator testing, in the present numerical solutions. The predicted minimum and central film thicknesses were compared favourably with those estimated from various formulae available in the literature. In particular, it was shown that both the minimum and the central film thickness expressions derived by Hamrock and Dowson were reasonably accurate for all the conditions considered in the present study.

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31

SHIGETOSHI, Kenji, Tadao ISAKA, Ryuta OZAWA, Tetsuya MORIZONO, and Sadao KAWAMURA. "Measurement and Analysis on Human Torque/Angular Velocity/Angle Position Characteristics Using Isoviscous Loading(Mechanical Systems)." Transactions of the Japan Society of Mechanical Engineers Series C 75, no. 750 (2009): 343–48. http://dx.doi.org/10.1299/kikaic.75.343.

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32

Balan, Mihaela Rodica, Vasile Ciprian Stamate, Luc Houpert, Ana Tufescu, and Dumitru Olaru. "Influence of the Geometry on the Rolling Friction Torque in Lubricated Ball-Race Contacts." Applied Mechanics and Materials 658 (October 2014): 271–76. http://dx.doi.org/10.4028/www.scientific.net/amm.658.271.

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Based on a theoretical model and an experimental methodology for defining the friction torque in a modified thrust ball bearing having only 3 balls and presented in [2], the authors experimentally investigated the influence of the ball diameter on friction torque when operating in mixed and full film lubrication conditions and maintaining the normal load, the race curvature and oil viscosity constant. The experiments were realized using ball diameters between 7.938 mm and 3 mm corresponding to maximum Hertzian pressure between 0.264 GPa and 1 GPa and a rotational speed between 60 rpm to 240 rpm. The experiments confirmed that the measured friction torque can be explained using hydrodynamic rolling force relationships respecting the transition from IsoViscous Rigid (IVR) to ElastoHydrodynamic Lubrication (EHL) regime presented in [2].

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33

Singh, Niranjan, and RK Awasthi. "Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 11 (March 31, 2020): 1712–25. http://dx.doi.org/10.1177/1350650120915053.

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In the present work, theoretical investigation has been performed to predict the influence of spherical textures on the performance characteristics of two-lobe journal bearing system. The flow of lubricant in the clearance space between the bearing and the journal is governed by the Reynolds equation assuming the flow is Newtonian and isoviscous. The Reynolds equation is solved using a finite element method and the static performance parameters of circular/two-lobe smooth/textured journal bearing system have been computed with variation in eccentricity ratio, dimple depth and its location. The numerically simulated results reveal that the partial surface texturing can provide better performance when the textures are created in the pressure build-up region of 126°–286° and the dimple aspect ratio is nearly 1.0.

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34

Ashman, D. "Investigation of the Failure of Heavily Loaded Journal Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 208, no. 3 (September 1994): 167–71. http://dx.doi.org/10.1243/pime_proc_1994_208_367_02.

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This paper gives details of a combined theoretical and experimental investigation of a plain journal bearing under heavily loaded conditions together with a metrological study of the bearing geometry. It was found that under high loading conditions a simplified analytical expression relating the Sommerfeld number to the non-dimensional minimum film thickness, using a hydrodynamic solution of the isoviscous form of the Reynolds equation, could be developed. An alternative theoretical solution based on elastohydrodynamic lubrication was also considered. In addition, experimental work determined a variety of operating conditions that produced metal-to-metal contact. These operating conditions were then compared with the theoretical minimum film thickness calculations and bearing manufacturing data. This process was used to determine combined failure criteria based on operating conditions and machining capability.

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35

Mishra, S. K., H. Chandra, and A. Arora. "Effects on Heat Transfer and Radial Temperature Profile of Non-Isoviscous Vibrational Flow with Varying Reynolds Number." Journal of Applied Fluid Mechanics 12, no. 1 (January 1, 2019): 135–44. http://dx.doi.org/10.29252/jafm.75.253.28952.

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36

ITOH, KUNIHIKO, KATSUMI MITA, KUMI AKATAKI, MAKOTO WATAKABE, TOSHIMI SOEDA, HISAKO NONAKA, and ATSUO KATOH. "MECHAICAL PROPERTIES OF DYNAMIC MUSCLE CONTRACTION AGAINST VISCOSITY RESISTANCE (ISOVISCOUS CONTRACTION) ITS COMPARISON WITH ISOTONIC AND ISOKINETIC CONTRACTION." Japanese Journal of Physical Fitness and Sports Medicine 46, no. 2 (1997): 211–19. http://dx.doi.org/10.7600/jspfsm1949.46.211.

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37

De Pellegrin, Dennis V., and Douglas J. Hargreaves. "An isoviscous, isothermal model investigating the influence of hydrostatic recesses on a spring-supported tilting pad thrust bearing." Tribology International 51 (July 2012): 25–35. http://dx.doi.org/10.1016/j.triboint.2012.02.008.

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38

Hsiao, Hsing-Sen S., Bharat Bhushan, and Bernard J. Hamrock. "Ultrathin Liquid Lubrication of Magnetic Head-Rigid Disk Interface for Near-Contact Recording: Part I—A Closed-Form Solution to the Reynolds Equation." Journal of Tribology 118, no. 2 (April 1, 1996): 388–95. http://dx.doi.org/10.1115/1.2831314.

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A closed-form approximate solution to ultrathin and near-zero-pitch liquid lubrication of magnetic head-rigid disk interfaces for near-contact recording is derived. This study focuses on the steady state at the fully flooded rail-disk contact condition. It is assumed that the lubricant in the interface is isoviscous and the slider is in the no-roll and no-yaw situation. Simple dimensionless groups of operating factors are identified to facilitate the parametric study of performance. Results of interface geometry effects on load, location of pressure center, friction force, and friction coefficient are presented. Typical distributions of pressure and shear stress at rail surface are also presented. The important effects such as shear thinning and thermal thinning are incorporated by introducing shear thinning and thermal thinning factors. Implementation of these correction factors will be presented in Part II.

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39

Cai, Lingzhi, Joel Marthelot, and P. T. Brun. "An unbounded approach to microfluidics using the Rayleigh–Plateau instability of viscous threads directly drawn in a bath." Proceedings of the National Academy of Sciences 116, no. 46 (October 28, 2019): 22966–71. http://dx.doi.org/10.1073/pnas.1914270116.

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We study the droplet-forming instability of a thin jet extruded from a nozzle moving horizontally below the surface of an isoviscous immiscible fluid bath. While this interfacial instability is a classic problem in fluid mechanics, it has never been studied in the context of the deposition of a thread into a reservoir, an open-sky version of microfluidics. As the nozzle translates through the reservoir, drops may form at the nozzle (dripping) or further downstream (jetting). We first focus on rectilinear printing paths and derive a scaling law to rationalize the transition between dripping and jetting. We then leverage the flexibility of our system and study the dynamics of breakup when printing sinusoidal paths. We unravel a methodology to control both the size of the drops formed by the instability and the distance that separates them.

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40

Fowler, A. C., Raquel Toja, and Carlos Vázquez. "Temperature-dependent shear flow and the absence of thermal runaway in valley glaciers." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2114 (October 28, 2009): 363–82. http://dx.doi.org/10.1098/rspa.2009.0335.

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We propose a two-dimensional model of a valley glacier in order to reconsider the question of whether thermal runaway could be a viable mechanism for the onset of creep instability in surging glaciers. We do this by providing an approximate solution for the temperature field based on the idea that shear is concentrated at the glacier bed. With this assumption, we show that a closed-form evolution equation for the glacier profile exists. While this is well known for isoviscous flows, it has not been previously derived for variable viscosity flows. During the process of deriving this equation, we show that thermal runaway does not occur. We provide numerical solutions of the model, and are led to infer that enhanced basal heating owing to refreezing of surface meltwater is an essential constituent in raising the bed temperature to the melting point.

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41

Besanjideh, M., and S. A. Gandjalikhan Nassab. "Effect of Lubricant Compressibility on Hydrodynamic Behavior of Finite Length Journal Bearings Running under Heavy Load Conditions." Journal of Mechanics 32, no. 1 (July 15, 2015): 101–11. http://dx.doi.org/10.1017/jmech.2015.51.

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ABSTRACTThe journal bearings which are designed for heavy-duty operations could experience different lubricant density due to high bearing loads. In the present work, hydrodynamic behaviour of finite length journal bearings under laminar and isoviscous flow with variable density are investigated. For this purpose, three-dimensional continuity and momentum equations along with a proper density-pressure relation are solved numerically, using CFD technique. Also, an appropriate cavitation model based on mass conservation is involved in the computation. Because of complex geometry of journal bearing, a conformal mapping is employed to generate an orthogonal grid and the governing equations are transformed in the computational domain. Since the degree of oil compressibility can be depended to the type of lubricant, typical mineral and synthetic oils treatments are modelled, separately. Results indicate that the oil compressibility effect leads to increasing load carrying capacity such that this increase is slightly more for the synthetic oil.

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42

HATAKENAKA, Kiyoshi, and Daisuke KONDO. "111 Comparison between Measured and Predicted Stability of Floating Bush Journal Bearings : In Case of Isoviscous Hydrodynamic Lubrication Model." Proceedings of Conference of Kyushu Branch 2010.63 (2010): 21–22. http://dx.doi.org/10.1299/jsmekyushu.2010.63.21.

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43

Lee, Rong-Tsong, and B. J. Hamrock. "Squeeze and Entraining Motion in Nonconformal Line Contacts. Part I—Hydrodynamic Lubrication." Journal of Tribology 111, no. 1 (January 1, 1989): 1–7. http://dx.doi.org/10.1115/1.3261873.

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Abstract:

An analytical solution to the problem of combined entraining and normal squeeze motion in nonconformal line contacts hydrodynamically lubricated with an isoviscous, incompressible lubricant has been obtained without any limitations on dimensionless load, dimensionless entraining velocity, and dimensionless velocity parameter. The dimensionless load and entraining velocity are fixed for a complete range of operating parameters for both normal approach and separation. Results show that the lubrication of the outlet boundary and the location of the maximum pressure move upstream into the inlet region as the central film thickness decreases or the dimensionless velocity parameter increases from negative (normal approach) to positive (normal separation). All the dynamic performance parameters relating to the steady-state bearing performance parameters have been found to be functions of only the dimensionless velocity parameter with constant load and entraining velocity. The dimensionless velocity parameter significantly influenced those dynamic performance parameters. The results of this study will be used as the initial guess for the elastohydrodynamic lubrication of nonconformal line contacts.

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44

Bair, Scott, Yuchuan Liu, and Q. Jane Wang. "The Pressure-Viscosity Coefficient for Newtonian EHL Film Thickness With General Piezoviscous Response." Journal of Tribology 128, no. 3 (March 3, 2006): 624–31. http://dx.doi.org/10.1115/1.2197846.

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There has been a long-standing need for a piezoviscous parameter αfilm that, together with the ambient viscosity μ0, will completely quantify the Newtonian rheology so that the film thickness for liquids that do not shear-thin in the inlet may be calculated as h=h(μ0,αfilm,…), regardless of the details of the pressure-viscosity response. It seems that Blok’s reciprocal asymptotic isoviscous pressure has certain advantages over the conventional pressure-viscosity coefficient, which is poorly suited for this purpose. The first detailed review of piezoviscous models for low pressures is provided. A simulation code that is apparently stable for all realistic pressure-viscosity response was utilized with diverse piezoviscous models and model liquids to develop a satisfactory definition of αfilm that reads αfilm=[1−exp(−3)]∕[∫03∕α*μ(0)dp∕μ(p)]; 1∕α*=∫0∞μ(0)dp∕μ(p). In the case of μ=μ0exp(αp),αfilm=α and formulas are provided for other models.

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45

Janca, Josef. "Three-Dimensional Isoviscous Flow Velocity Profiles and Resolution in Channels with Modulated Cross-Sectional Permeability for Focusing Field-Flow Fractionation." Journal of Liquid Chromatography & Related Technologies 14, no. 18 (November 1, 1991): 3317–30. http://dx.doi.org/10.1080/01483919108049393.

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SHIGETOSHI, Kenji, Sadao KAWAMURA, and Tadao ISAKA. "B32 The potential of high speed training using a mechanical impedance display device : investigation into combination of isoviscous and inertia load." Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics 2008 (2008): 347–52. http://dx.doi.org/10.1299/jsmesports.2008.0_347.

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47

Janča, J., M. Hoyos, and M. Martin. "Comparison of approximate and exact description of isoviscous flow velocity profile formed in rectangular cross-section channel for field-flow fractionation." Chromatographia 33, no. 5-6 (March 1992): 284–86. http://dx.doi.org/10.1007/bf02276196.

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48

Houpert, L. "Piezoviscous-Rigid Rolling and Sliding Traction Forces, Application: The Rolling Element–Cage Pocket Contact." Journal of Tribology 109, no. 2 (April 1, 1987): 363–70. http://dx.doi.org/10.1115/1.3261367.

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Abstract:

Piezoviscous Rigid (PVR) film thicknesses, rolling and sliding traction forces formulas for the line and point contact case have been derived. They have been used to study the Rolling Element (R.E.)–cage pocket contact mechanism. As the R.E. gets closer to the cage web, the lubrication regime change gradually from the PVR regime to Piezoviscous Elastic (PVE or EHD) regime when steel cages are used. If plastic cages are used, the lubrication regime moves from the Isoviscous Elastic (IVE) regime to EHD regime. For the conditions simulated herein, the transition occurs at typical film thickness values of the order of 0.5 micrometers and substantially large loads can be calculated in the R.E.–steel cage contact. They can be of the order of 100 N at the transition. In many circumstances, the PVR regime prevails and the braking moment due to hydrodynamic traction in the contact can be easily calculated. A tight osculation between the R.E. and the cage pocket will increase significantly the load and braking moment on the R.E. Starvation effects are also estimated and cause a reduction of the load, but not of the braking moment.

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Jalava, Juho Pertti. "Precipitation and properties of titania pigments in the sulfate process. 1. Preparation of the liquor and effects of iron(II) in isoviscous liquor." Industrial & Engineering Chemistry Research 31, no. 2 (February 1992): 608–11. http://dx.doi.org/10.1021/ie00002a024.

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Garel, F., E. Kaminski, S. Tait, and A. Limare. "An experimental study of the surface thermal signature of hot subaerial isoviscous gravity currents: Implications for thermal monitoring of lava flows and domes." Journal of Geophysical Research: Solid Earth 117, B2 (February 2012): n/a. http://dx.doi.org/10.1029/2011jb008698.

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