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Journal articles on the topic 'Dynamic viscosity coefficient'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Balevičius, Ramojus, and Paulius Miškinis. "THE AIR VISCOSITY COEFFICIENT AND OTHER RELATED VALUES." Mokslas - Lietuvos ateitis 12 (November 3, 2020): 1–4. http://dx.doi.org/10.3846/mla.2020.13767.

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Experimental measurements of the dynamic coefficient of air viscosity were done. Numerous other related values such as the kinematic coefficient of air viscosity, the mean free path and the mean thermal square velocity of air molecules were determined. The dependence of the air dynamic viscosity coefficient on temperature was also obtained. It allowed us to determine the Sutherland’s corrections and to estimate the dimension of air molecules and the temperature gradients of the dynamic and kinematic coefficients of the air viscosity. The determined values were compared to the similar theoretic

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2

Ioana, Stanciu. "Some Methods for Determining the Viscosity Index of Hydraulic Oil." Indian Journal of Science and Technology 16, no. 4 (2023): 254–58. https://doi.org/10.17485/IJST/v16i4.1461.

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ABSTRACT <strong>Objectives:</strong> To determine the viscosity index of hydraulic oil by three methods. These methods are: the viscosity index determined by a mathematical relationship, using a calculation program and the graphic method. The study also intends to determine the viscosity-temperature coefficient for the hydraulic oil. <strong>Methods:</strong> To determine the kinematic viscosity of the hydraulic oil, we used a calculation formula that transforms the dynamic viscosity into kinetic viscosity knowing the density of the fluid. Thus, we determined the dynamic viscos

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3

Minhas, Zill-e. Hasnain, and Sun Qin. "Evolution of the Coefficient of Dynamic Viscosity with Growing Damage in Metals." Applied Mechanics and Materials 313-314 (March 2013): 72–76. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.72.

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Coefficient of dynamic viscosity (η) for uniaxial rectangular bar of steel is calculated using creep simulation in Ansys. Norton Secondary creep law with coefficients at 600 ᵒC is used. Steel bar is then inflicted with some damage elements in order to investigate the evolution of dynamic viscosity for varying degree of fatigued specimen at constant rate and temperature. Isotropic damage parameter (D) based on the volume fraction of damaged elements is used to formulate a linear relation between the coefficient of viscosity and D. It is found that with 0.001 increase is damage parameter (D), al

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4

Bizhigitov, T., A. Sembyieva, and N. Turgymbekov. "INVESTIGATION OF THE INFLUENCE OF TEMPERATURE ON FUEL VISCOSITY COEFFICIENTS." Scientific heritage, no. 112 (May 7, 2023): 42–47. https://doi.org/10.5281/zenodo.7903704.

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The study of the temperature dependence of petroleum products at atmospheric pressure is of great practical and theoretical importance. Since the air temperature on our planet changes at long intervals, the study of the temperature dependence of the viscosity coefficients and kinematic viscosity characterizing the flow rate of fuel used as an energy source in automobiles, railways, and water transport contributes to improving the quality of technical work. In the article, as a model, the coefficients of dynamic, kinematic viscosity of diesel fuels DS (summer), DW (winter), often used in produc

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5

Пряжников, М. И., та А. В. Минаков. "Объемная вязкость суспензии наночастиц оксида кремния". Письма в журнал технической физики 46, № 12 (2020): 37. http://dx.doi.org/10.21883/pjtf.2020.12.49526.18237.

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Data on the bulk viscosity of an aqueous suspension of SiO2 nanoparticles (Ludox TM-50) were obtained using an acoustic spectrometer for the first time. A wide range of mass concentrations of nanoparticles (from 1 to 50 wt.%) was considered. The spectra of the attenuation coefficient of ultrasound and the coefficients of longitudinal and dynamic viscosity were measured. The dependences of the dynamic and bulk viscosity coefficients of the suspensions on the nanoparticle concentration were obtained.

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6

Rudyak, Valeriy. "Modern Status Of Researches Of Nanofluids Viscosity." Siberian Journal of Physics 10, no. 1 (2015): 5–22. http://dx.doi.org/10.54362/1818-7919-2015-10-1-5-22.

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In present paper the regular review of researches of nanofluids viscosity is made. Known experimental data and data of molecular dynamic simulation are considered. It is shown, that nanofluid viscosity is not described by the classical theories. All experimental data and molecular dynamics simulations suggest that at a fixed volume concentration of nanoparticles, the nanofluid viscosity is significantly higher than the viscosity of conventional suspensions. Generally it depends not only on concentration наночастиц, but also from their size. The viscosity coefficients increase with decreasing n

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7

Kubich, V. I. "YNAMIC VISCOSITY OF THE LUBRICANT AND ITS EFFECT ON STEEL MATERIALS WITH BORON." Eurasian Physical Technical Journal 20, no. 1(43) (2023): 27–33. http://dx.doi.org/10.31489/2023no1/27-33.

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In this work, the regularities of the change in the shear strength of the adhesive bond τ0and the piezoelectric coefficient β in the metal systems "12Kh2N4 (45KhN2MFA) -steel 45 + B", "12Kh2N4 (45KhN2MFA) -steel 45 + VS" were obtained during physical modeling of the shear of surfaces of small-sized samples and changes in dynamic viscosity environment of their interaction with the use of additional equipment of the SMTs-2 friction machine. It has been established that boridingand boron carburizing of the surface of steel 45 leads to the absence of adhesion to the surfaces of steels 12Kh2N4 and

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8

Bogdevicius, Marijonas, and Jolanta Janutėnienė. "Influence of Dynamic Viscosity on Automatic Dynamic Balance." Solid State Phenomena 164 (June 2010): 127–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.127.

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The paper deals with analysis of dynamic stability and behavior of automatic dynamic balance (ADB) by applying theoretical approach. Differential equations of the considered system were established using Lagrange equation. Numerical analysis of the dynamic equations was performed and influence of dynamic viscosity coefficient on self-balancing process was estimated. It is demonstrated that the balancing time decreases in non-linear character. The optimal value of dynamic viscosity for achieving minimal balancing time can be determined for the analyzed system.

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9

Kumar, Ashutosh, and SK Kakoty. "Effect of couple stress parameter on steady-state and dynamic characteristics of three-lobe journal bearing operating on TiO2 nanolubricant." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 4 (2019): 528–40. http://dx.doi.org/10.1177/1350650119866028.

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Steady-state and dynamic performance parameters of three-lobe fluid film bearing, operating on TiO2 nanolubricant have been obtained. The effective viscosity for a given volume fraction of TiO2 nanoparticle in base fluid is obtained by using Krieger–Dougherty viscosity model. Various bearing performance parameters are obtained by solving remodeled Reynolds equation, which includes couple stress parameter. The stiffness and damping coefficients are also obtained for different values of the couple stress parameter. Results show a significant rise in the nondimensional load-carrying capacity and

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10

Bizhigitov, T., A. Sembyieva, and A. Khojagalieva. "INVESTIGATION OF THE TEMPERATURE DEPENDENCE OF THE VISCOSITY COEFFICIENTS OF HYDROCARBONS." Scientific heritage, no. 112 (May 7, 2023): 47–50. https://doi.org/10.5281/zenodo.7903708.

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In the article, for the first time, the dependence of the viscosity coefficients of an organic mixture consisting of carbon and hydrogen, which are part of the most commonly used petroleum products in practice, on the temperature at atmospheric pressure was investigated and determined by experimental measurements and calculations using laws and formulas known from physics in the temperature range (300-380) K. The experimental setup was implemented by improving the classical the Stokes method, which determines the coefficient of dynamic viscosity of liquids at room temperature, atmospheric pres

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11

Aliasgari, Mojgan, Nahid Maleki-Jirsaraei, and Shahin Rouhani. "The effect of liquid viscosity on sliding friction coefficient of wet granular materials." EPJ Web of Conferences 249 (2021): 08003. http://dx.doi.org/10.1051/epjconf/202124908003.

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The mechanical properties of wet granular materials are different to those of dry granular matter. If the wet granular medium is not completely saturated, the capillary bridges form and the surface tension changes the elastic properties of the medium. We studied the sliding friction of a sledge over wet granular media and found that surface tension and viscosity have crucial effect on the dynamic friction coefficient of the wet granular media. Higher the viscosity of the interstitial liquid results in higher dynamic friction coefficient. Furthermore, viscous interstitial liquid shows time depe

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12

Nikolaev, Alexander, and Kristina Plotnikova. "Study of the Rheological Properties and Flow Process of High-Viscosity Oil Using Depressant Additives." Energies 16, no. 17 (2023): 6296. http://dx.doi.org/10.3390/en16176296.

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This article analyzes the dependence of the choice of the method of transportation of high-viscosity oil on the rheological characteristics of the oil in question. An analysis of existing rheological models of high-viscosity oil was carried out, and it was found that a number of models have certain features (model coefficients, their purpose, quantity) that affect the choice of a rheological model of oil. The dependences for determining the coefficient of dynamic viscosity when pumping high-viscosity oil with the addition of pour-point depressants were studied, and the dependence of the hydrau

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13

Bizhigitov, T., and E. Madaliyeva. "METHODS FOR STUDYING THE DEPENDENCE OF MOLECULES ON PHYSICAL PARAMETERS CHARACTERIZING THEIR ACTIVATION ENERGY." Bulletin of Dulaty University 1, no. 13 (2024): 242–47. http://dx.doi.org/10.55956/anws4471.

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The article describes the principles of operation of devices that practically determine the activation energies of molecules of liquids, discusses their advantages and disadvantages from each other. Methods for calculating the activation energy by measuring parameters that determine the dynamic and kinematic viscosity coefficients of liquids are shown. The physical meanings of formulas describing the empirical dependence of the relaxation time of molecules using the activation energies, the dynamic viscosity coefficient on the temperature with the activation energy are discussed in detail and

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14

Stanciu, Ioana. "Temperature-dependent Changes in the Dynamic Viscosity of Oxidized and Non-oxidized Olive Oils." Oriental Journal Of Chemistry 40, no. 6 (2024): 1836–40. https://doi.org/10.13005/ojc/400636.

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The Azian equation was used to analyze how dynamic viscosity changed with temperature. The Azian equation, which may be used to explain how dynamic viscosity depends on temperature, is found to better approximate the actual data when the correlation coefficient values of the two equations are examined. At every speed and temperature at which the oils were tested, the analysis of the experimental data revealed that olive oil had the least amount of temperature-dependent dynamic viscosity increase. Since oils with a high degree of dynamic viscosity stability are required in industrial applicatio

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15

WIERZCHOLSKI, Krzysztof, and Andrzej MISZCZAK. "IMPACT OF ADHESION AND VISCOSITY FORCES ON FRICTION VARIATIONS IN BIO-TRIBOLOGICAL SYSTEMS." Tribologia 278, no. 2 (2018): 139–51. http://dx.doi.org/10.5604/01.3001.0012.6987.

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The classical theory of lubrication holds that the lubricant dynamic viscosity increments cause the increments of hydrodynamic pressure, as well as friction forces and wear. In the case of high values of hydrodynamic pressure, it very often has a significant impact on the friction coefficient. New achievements in the field of micro-and nano-tribology provide for new hypotheses on the decrements and increments of the friction coefficient in the case of the lubricant viscosity increments. Experimental investigations have shown that, even in the case of decrements of the friction coefficient with

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16

Villamayor, Antía, María J. G. Guimarey, Fátima Mariño, et al. "High-Pressure Thermophysical Properties of Eight Paraffinic, Naphthenic, Polyalphaolefin and Ester Base Oils." Lubricants 11, no. 2 (2023): 55. http://dx.doi.org/10.3390/lubricants11020055.

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In this work, the thermophysical properties of four mineral (paraffinic and naphthenic) and four synthetic (polyalphaolefin and ester) base oils are measured. Knowledge of these properties is of vital importance for the correct and optimal formulation and design of lubricants, and for the development of equations of state and transport models that adequately represent their properties. Density, isothermal compressibility, thermal expansion coefficient, dynamic viscosity, pressure–viscosity coefficient, and contact angle were determined. To carry out this work, a pρT apparatus, a rotational vis

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17

Gromkov, A. S., N. M. Ignatenko, G. A. Melnikov, V. V. Suchilkin, and O. A. Manzhos. "Density, thermal expansion, dynamic viscosity of halogenated arenes." Proceedings of the Southwest State University. Series: Engineering and Technology 14, no. 3 (2024): 87–104. http://dx.doi.org/10.21869/2223-1528-2024-14-3-87-104.

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Purpose. Experimental study of the density, thermal expansion and dynamic viscosity of halogenated arenes at temperatures from 293.15 to 343.15 K and atmospheric pressure 97.992 kPa.Methods. Density was determined by the pycnometric method, viscosity by the capillary method. A quartz pycnometer type PZh2 with a nominal capacity of 10 ml and a glass capillary viscometer type VPZh-2 with a nominal capillary diameter of 0.34 mm were used. The mass of liquids was measured using an electronic scale VSL-200/0.1A with a division value of 0.0001 g. Numerical methods were used to process the experiment

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18

Tabassum, R., Rashid Mehmood, O. Pourmehran, NS Akbar, and M. Gorji-Bandpy. "Impact of viscosity variation on oblique flow of Cu–H2O nanofluid." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 5 (2017): 622–31. http://dx.doi.org/10.1177/0954408917732759.

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The dynamic properties of nanofluids have made them an area of intense research during the past few decades. In this article, flow of nonaligned stagnation point nanofluid is investigated. Copper–water based nanofluid in the presence of temperature-dependent viscosity is taken into account. The governing nonlinear coupled ordinary differential equations transformed by partial differential equations are solved numerically by using fourth-order Runge–Kutta–Fehlberg integration technique. Effects of variable viscosity parameter on velocity and temperature profiles of pure fluid and copper–water n

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19

Ślęzak, Marta, and Marek Warzecha. "Investigations of Liquid Steel Viscosity and Its Impact as the Initial Parameter on Modeling of the Steel Flow through the Tundish." Materials 13, no. 21 (2020): 5025. http://dx.doi.org/10.3390/ma13215025.

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The paper presents research carried out to experimentally determine the dynamic viscosity of selected iron solutions. A high temperature rheometer with an air bearing was used for the tests, and ANSYS Fluent commercial software was used for numerical simulations. The experimental results obtained are, on average, lower by half than the values of the dynamic viscosity coefficient of liquid steel adopted during fluid flow modeling. Numerical simulations were carried out, taking into account the viscosity standard adopted for most numerical calculations and the average value of the obtained exper

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20

Hajibalayev, E. R. "Dynamic Viscosity of Gases at Temperature and Pressure." Herald of Azerbaijan Engineering Academy 15, no. 2 (2023): 64–68. https://doi.org/10.52171/2076-0515_2023_15_02_64_68.

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The following issues are considered in the article: the concept of viscosity in liquids andgases; the effect of pressure and temperature changes on the process. Dependence of viscosity ofnatural gas on pressure and temperature. Based on laboratory studies, the analysis was performedusing the small squares method and an empirical equation was obtained. Determining the error ina given value of the correlation coefficient.

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21

Zhuo, Rui Hua, Shu Wang Yan, and Lei Yu Zhang. "Dynamic Stability Analysis of Viscoelastic Beam under the Follower Forces." Advanced Materials Research 413 (December 2011): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.413.283.

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The unification differential equation of buckling and motion of viscoelastic beam subjected to the uniformly distributed follower forces in time domain was established by differential operators including extension viscosity, shearing viscosity and moment of inertia. According to the unification differential equation, dynamic stability of three-parameter model of viscoelastic beams subjected to follower forces with clamped-free supported boundary condition was firstly analyzed by power series. The relations of the follower force versus vibration frequency and decay coefficient were obtained, so

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22

Prążyńska, Aleksandra, and Zbigniew Mikołajczyk. "Identification of the Process of Dynamic Stretching of Threads in Warp-Knitting Technology." Autex Research Journal 17, no. 4 (2017): 334–43. http://dx.doi.org/10.1515/aut-2016-0039.

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Abstract The publication presents a theoretical study of the susceptibility of rheological models of threads to dynamic stretching in the context of modern, highly efficient textile technologies. Input parameters of the four analyzed models, the Kelvin-Voigt model, the Maxwell model, Standard model 2, and the Zener model, corresponded to the actual values of the coefficients of viscosity, elasticity, kinematic and dynamic loading, and stretching speed for the analyzed polyester silk threads produced in a knitting process, with knitting speeds from 700 to 1,600 courses/min. The research proves

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23

Kumbár, Vojtěch, and Jiří Votava. "Excessive Additive Effect On Engine Oil Viscosity." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no. 5 (2014): 1015–20. http://dx.doi.org/10.11118/actaun201462051015.

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The main goal of this paper is excessive additive (for oil filling) effect on engine oil dynamic viscosity. Research is focused to commercially distribute automotive engine oil with viscosity class 15W–40 designed for vans. There were prepared blends of new and used engine oil without and with oil additive in specific ratio according manufacturer’s recommendations. Dynamic viscosity of blends with additive was compared with pure new and pure used engine oil. The temperature dependence dynamic viscosity of samples was evaluated by using rotary viscometer with standard spindle. Concern was that

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24

Rashid, B., A. H. H. Muggeridge, A. Bal, and G. Williams. "Quantifying the Impact of Permeability Heterogeneity on Secondary-Recovery Performance." SPE Journal 17, no. 02 (2012): 455–68. http://dx.doi.org/10.2118/135125-pa.

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Summary An improved heterogeneity/homogeneity index is introduced that uses the shear-strain rate of the single-phase-velocity field to characterize heterogeneity and rank geological realizations in terms of their impact on secondary-recovery performance. The index is compared with the Dykstra-Parsons coefficient (Dykstra and Parsons 1950) and the dynamic Lorenz coefficient (Shook and Mitchell 2009). The results show that the index's ranking ability is preserved for miscible and immiscible displacements at different viscosity/mobility ratios. Neither the Dykstra-Parsons coefficient (Dykstra an

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25

А.В., Федоров, Волков С.М., Мельник Г.Е., Новосёлов А.Г. та Федоров А.А. "Сравнительный анализ методик реологических исследований на основе модели структурного состояния жидкой фазы подсолнечного масла". Вестник Всероссийского научно-исследовательского института жиров, № 1-2 (21 грудня 2019): 27–30. http://dx.doi.org/10.25812/vniig.2019.90.54.011.

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В процессе реологических исследовании образцов подсолнечного масла методом ротационной вискозиметрии авторами получены результаты, свидетельствующие об образовании относительно устойчивого структурного состояния жидкой фазы подсолнечного масла, обладающего более высокой динамической вязкостью, чем в исходном состоянии. Вследствие данного эффекта при температурах менее 50°С наблюдается рост численных значений коэффициента динамической вязкости подсолнечного масла почти на 5 % по сравнению с методом Гепплера. При исследовании образцов 95 % мисцеллы подсолнечного масла методом ротационной вискози

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26

Ramin oğlu Hacıbalayev, Elvin. "DYNAMIC VISCOSITY OF GASES AT TEMPERATURE AND PRESSURE." SCIENTIFIC RESEARCH 07, no. 3 (2022): 26–28. http://dx.doi.org/10.36719/2789-6919/07/25-28.

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Məqalədə Maye və qazlarda özlülük anlayışı, təzyiq və temperaturun dəyişməsinin prosesə təsiri, təbii qazın özlülüyünün təzyiq və temperaturdan aılılığı, laboratoriya tədqiqatlarını əsas götürərək, kiçik kvadratlar metodu vasitəsilə analiz aparılmış və emprik tənlik əldə edilmişdir. Korrelyasiya əmsalının verilmiş qiymətində xəta təyin olunmuşdur. Açar sözlər:qaz, özlülük, təzyiq, temperatur, laboratoriya tədqiqatları Elvin Ramin Hajibalayev DYNAMIC VISCOSITY OF GASES AT TEMPERATURE AND PRESSURE Abstract The following issues are considered in the article: The concept of viscosity in liquids an

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Dolomatov, Mikhail Yu, Timur M. Aubekerov, Oleg S. Koledin, et al. "QSPR model for the forecast of dynamic viscosity of arenas by the topological characteristics of molecules." Butlerov Communications 62, no. 6 (2020): 1–6. http://dx.doi.org/10.37952/roi-jbc-01/20-62-6-1.

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Prediction of the dynamic viscosity of saturated hydrocarbons vapors is an important step in the calculation of various processes and apparatuses in chemical technology. In order to quickly determine the dynamic viscosity without resorting to the use of expensive equipment, methods of mathematical modeling are currently used. To predict the dynamic viscosity of saturated arenas vapors, a nonlinear multivariate regression model QSPR is proposed. The model associates with a dynamic viscosity a set of descriptors – the topological characteristics of molecular graphs: the Randic index, the Wiener

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28

Balla, Hyder, Shahrir Abdullah, Wan Faizal, Rozli Zulkifli, and Kamaruzaman Sopian. "Enhancement of heat transfer coefficient multi-metallic nanofluid with ANFIS modeling for thermophysical properties." Thermal Science 19, no. 5 (2015): 1613–20. http://dx.doi.org/10.2298/tsci121128139b.

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Cu and Zn-water nanofluid is a suspension of the Cu and Zn nanoparticles with the size 50 nm in the water base fluid for different volume fractions to enhance its Thermophysical properties. The determination and measuring the enhancement of Thermophysical properties depends on many limitations. Nanoparticles were suspended in a base fluid to prepare a nanofluid. A coated transient hot wire apparatus was calibrated after the building of the all systems. The vibro-viscometer was used to measure the dynamic viscosity. The measured dynamic viscosity and thermal conductivity with all parameters aff

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Wan, Guo Xiang, Qi Sheng Wang, and Wen Biao Zeng. "Intensity Variation of the Electromagnetic Emission (EME) of Rock Masses Failure under Dynamic Load." Advanced Materials Research 900 (February 2014): 699–702. http://dx.doi.org/10.4028/www.scientific.net/amr.900.699.

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Incident frequency of wave on the intensity variation of the EME had been studied in this paper, based on failure test under dynamic load of Granite. The results show that the intensity of EME gradually attenuates with increasing of incident frequency of wave. The intensity of EME with the joint stiffness; the intensity of EME increases with viscosity coefficient; the variation of the EME with viscosity coefficient is influenced by frequency. The research outcomes are in agreement with others experimental results.

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Yan, Ruqi, Baodui Chai, Lu Ma, Hanqing Chen, and Xuexing Ding. "Dynamic Coefficient Investigation for Supercritical Carbon Dioxide Dry Gas Seal Based on Complete Variable Perturbation Model." Lubricants 12, no. 9 (2024): 298. http://dx.doi.org/10.3390/lubricants12090298.

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In this work, a new model to analyse the dynamic characteristic coefficient of the S-CO2 dry gas seal was reported. Taking into account that the flow within the S-CO2 dry gas seal is close to adiabatic flow, the impact of the temperature change on the dynamic characteristic coefficient of the gas film cannot be ignored. To address this issue, a complete variable perturbation model (CVPM) under the adiabatic flow process was established using the frequency perturbation method while considering multiple complex effects. Then, the finite difference method was used to solve the CVPM. The gas film’

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31

Jordan, Stephen A. "Dynamic Subgrid-Scale Modeling for Large-Eddy Simulations in Complex Topologies." Journal of Fluids Engineering 123, no. 3 (2001): 619–27. http://dx.doi.org/10.1115/1.1374215.

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The dynamic eddy-viscosity relationship is a suitable choice for modeling the subgrid-scales (SGS) in a large-eddy simulation (LES) of complex turbulent flows in irregular domains. This algebraic relationship is easy to implement and its dynamic coefficient will give negligible turbulent viscosity contributions in the flow regions that are irrotational or laminar. Its fine-scale turbulence predictions can be qualitatively reasonable if the local grid resolution maintains the SGS field predominantly within the equilibrium range of turbulent energy spectra. This performance is given herein by tw

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32

Kubich, V. I. "INFLUENCE OF BORINATION, BORON CEMENTATION OF STEEL 45 AND VISCOSITY OF A LUBRICANT ON THE PARAMETERS OF ADHESION BOND IN THE STEEL 45 - 40X SYSTEM." Eurasian Physical Technical Journal 18, no. 2 (2021): 67–75. http://dx.doi.org/10.31489/2021no2/67-75.

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In the work, the regularities of changes in the shear strength of the adhesive bond τ and the piezoelectric coefficient β in the metal systems "steel 45 - 40X", "steel 45+В-40Х", "steel 45+ВС-40Х" were obtained during physical modeling of the materials I-20A, Wolf 10W-40, TAD-17i, Litol-24 with distinctive dynamic viscosities using the additional equipment of the SMTs-2 friction machine. It has been established that a twofold increase in the shear rate causes a decrease in the piezoelectric coefficient in the "steel 45+VS - 40X" system by a factor of 1.2-1.6 for Wolf 10W-40, TAD-17i, Litol-24

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Ślęzak, M. "Mathematical Models For Calculating The Value Of Dynamic Viscosity Of A Liquid." Archives of Metallurgy and Materials 60, no. 2 (2015): 581–89. http://dx.doi.org/10.1515/amm-2015-0177.

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AbstractThe objective of this article is to review models for calculating the value of liquid dynamic viscosity. Issues of viscosity and rheological properties of liquid ferrous solutions are important from the perspective of modelling, along with the control of actual production processes related to the manufacturing of metals, including iron and steel. Conducted analysis within literature indicates that there are many theoretical considerations concerning the effect of viscosity of liquid metals solutions. The vast majority of models constitute a group of theoretical or semi-empirical equati

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34

Ashizawa, Satoshi, Toshiya Watanabe, Yuki Kamiya, Hidenori Aoki, and Takeo Oomichi. "Development of the Energy Simulator for the Water Hydraulic System Under Flow Condition Changes." Journal of Robotics and Mechatronics 23, no. 3 (2011): 416–25. http://dx.doi.org/10.20965/jrm.2011.p0416.

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The new energy simulator we developed is based on a hydraulic servosystem dynamic flow model introducing flow coefficients determined by Reynolds number. One is the pipe flow coefficient flow determined by the Moody diagram and the other is the servovalve flow coefficient based on flow model experiments. The motor dynamic model is introduced to determine efficiency such as coil resistance or rotor viscosity loss. Leakage of the hydraulic servovalve was also determined by the leak model. The feasibility of the proposed simulator was verified using computer simulation and experiments, showing di

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Moshinskiy, Aleksandr I., Pavel G. Ganin, Alla V. Markova, Larisa N. Rubtsova, and Vladislav V. Sorokin. "TAKING INTO ACCOUNT DEPENDENCE OF VISCOSITY COEFFICIENT ON TEMPERATURE DURING VAPOR CONDENSATION ON A VERTICAL WALL." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 5 (2020): 94–101. http://dx.doi.org/10.6060/ivkkt.20206305.6172.

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In the present study, the problem of vapor condensation on a flat vertical surface is investigated in the case of an arbitrary dependence of the dynamic viscosity coefficient on temperature according to a fairly general law. At a constant value of this coefficient and other characteristics of a condensing liquid (heat conductivity coefficient, density) this task was considered by Nusselt in a constant gravitational field. The results obtained by Nusselt formed the basis (with certain modifications) for the computational practice of heat exchange equipment of chemical technology in the presence

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Wu, Yao, Lihua Yang, Tengfei Xu, and Haoliang Xu. "Combined Effect of Rarefaction and Effective Viscosity on Micro-Elasto-Aerodynamic Lubrication Performance of Gas Microbearings." Micromachines 10, no. 10 (2019): 657. http://dx.doi.org/10.3390/mi10100657.

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Elastic deformation and gaseous rarefaction effects are of great importance to the static and dynamic characteristics of gas microbearings. Based on the effective viscosity model of Veijola, the governing equations can be solved by the partial derivative method, finite element procedure, and relaxed iterative algorithm. The numerical results showed that the maximum gas pressure is relatively lower compared to a microbearing with a rigid liner at a local pressure peak region, owing to the film thickness of two converging-diverging profiles and the existence of bimodal pressure inside the elasti

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Kustova, Elena, Mariia Mekhonoshina, Anna Bechina, Semen Lagutin, and Yulia Voroshilova. "Continuum Models for Bulk Viscosity and Relaxation in Polyatomic Gases." Fluids 8, no. 2 (2023): 48. http://dx.doi.org/10.3390/fluids8020048.

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Bulk viscosity and acoustic wave propagation in polyatomic gases and their mixtures are studied in the frame of one-temperature and multi-temperature continuum models developed using the generalized Chapman–Enskog method. Governing equations and constitutive relations for both models are written, and the dispersion equations are derived. In the vibrationally nonequilibrium multi-component gas mixture, wave attenuation mechanisms include viscosity, thermal conductivity, bulk viscosity, diffusion, thermal diffusion, and vibrational relaxation; in the proposed approach these mechanisms are fully

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Park, Noma, Sungwon Lee, Jungil Lee, and Haecheon Choi. "A dynamic subgrid-scale eddy viscosity model with a global model coefficient." Physics of Fluids 18, no. 12 (2006): 125109. http://dx.doi.org/10.1063/1.2401626.

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Cai, Lile, Junjing Lu, Zhengming Gao, and Ziqi Cai. "Dynamic Analysis Model for the Diffusion Coefficient in High-Viscosity Polymer Solution." Industrial & Engineering Chemistry Research 57, no. 46 (2018): 15924–34. http://dx.doi.org/10.1021/acs.iecr.8b03966.

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Magomadov, A. S. "Calculation of the Dynamic Viscosity Coefficient of Heavy Crudes at High Pressure." Chemistry and Technology of Fuels and Oils 40, no. 4 (2004): 270–74. http://dx.doi.org/10.1023/b:cafo.0000041227.53681.8e.

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Nanda, R. "Unusual linear dependency of viscosity with temperature in ionic liquid/water mixtures." Physical Chemistry Chemical Physics 18, no. 37 (2016): 25801–5. http://dx.doi.org/10.1039/c6cp05257f.

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Wang, Yanshuang, Qingguo Qiu, Pu Zhang, Xudong Gao, Zhen Zhang, and Pengcheng Huang. "Correlation between Lubricating Oil Characteristic Parameters and Friction Characteristics." Coatings 13, no. 5 (2023): 881. http://dx.doi.org/10.3390/coatings13050881.

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In order to help one to judge the friction properties of lubricating oils without tests, this paper intends to establish the correlation between the characteristic parameters of lubricating oils and the friction properties. The elastohydrodynamic and boundary friction properties of poly alpha olefin (PAO) synthetic oil, polyol ester oil and paraffin-based mineral oil were tested using a Mini-Traction Machine. Fourier transform infrared microscopy is used to identify material changes before and after friction tests. The kinematic and dynamic viscosities of the three lubricating oils were measur

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Chandler, W. L., and G. Schmer. "Evaluation of a new dynamic viscometer for measuring the viscosity of whole blood and plasma." Clinical Chemistry 32, no. 3 (1986): 505–7. http://dx.doi.org/10.1093/clinchem/32.3.505.

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Abstract We evaluated a new type of dynamic viscometer, the Sonoclot Coagulation Analyzer, for use in measuring the viscosity of whole-blood and plasma. Such information can be useful in monitoring patients with hyperviscosity syndromes, e.g., from multiple myeloma. A vibrating Teflon or plastic probe continuously measures dynamic viscosity. The instrument can be calibrated to measure a range of viscosities from 0.69 to 23 cP (mN X s X m-2) or more. The coefficient of variation at 0.69 cP was 3-4% for measurements with the Teflon probe, 7-9% with the plastic probe. Viscosity measured at 37 deg

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Tian, Xiang, and Wei Sheng. "Study on the Dynamic Characteristics of a SiC-Based Capacitive Micro-Accelerometer in Rarefied Air." Materials 15, no. 13 (2022): 4692. http://dx.doi.org/10.3390/ma15134692.

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In this study, we investigated the viscosity, squeeze-film damping, and a SiC-based capacitive micro-accelerometer in rarefied air. A specific expression for the effective viscosity coefficient of the air was derived, and when the air pressure drops from the standard atmospheric pressure, the viscosity of the air will decrease accordingly. Decreases in the air pressure and the viscosity of the air lead to the change in the squeeze-film air damping in the micro-accelerometer, and both the viscous damping force and the elastic damping force of the air film between the moving electrode plate and

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Wang, Zhen Qing, Ji Bin Wang, Wen Yan Liang, and Juan Su. "The Asymptotic Elastic-Viscoplastic Field at Mode I Dynamic Propagating Crack-Tip." Key Engineering Materials 348-349 (September 2007): 817–20. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.817.

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The viscosity of material is considered at propagating crack-tip. Under the assumption that the artificial viscosity coefficient is in inverse proportion to the power law of the plastic strain rate, an elastic-viscoplastic asymptotic analysis is carried out for moving crack-tip fields in power-hardening materials under plane-strain condition. A continuous solution is obtained containing no discontinuities. The variations of the numerical solution are discussed for mode I crack according to each parameter. It is shown that stress and strain both possess exponential singularity. The elasticity,

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Sun, Ge, Lin Yang, Weiwei Wang, et al. "An Algorithm for the Noninvasive and Personalized Measurement of Microvascular Blood Viscosity Using Physiological Parameters." BioMed Research International 2020 (September 1, 2020): 1–7. http://dx.doi.org/10.1155/2020/7013212.

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Blood viscosity is one of the important parameters to characterize hemorheological properties of the human body. Its real-time and dynamic measurement has important physiological significance for studying the development and prevention of chronic diseases. This study researched noninvasive and personalized measurement of microvascular blood viscosity. In the microcirculation capillary network blood flow model, combined with pulse wave parameters, multiple regression analysis was used to fit the simulated radius of personalized physiological blood vessels to calculate the microvascular blood vi

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O., H. Reidemeister, and V. Kivisheva A. "DEPENDENCE OF AIR SPRING PARAMETERS ON THROTTLE RESISTANCE." Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, no. 2(62) (April 25, 2016): 157–64. https://doi.org/10.15802/stp2016/67339.

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<strong>Purpose.</strong> In this paper it is necessary to conduct: 1) research and analyse the influence of throttle element pneumatic resistance on elastic and damping parameters of air spring; 2) to obtain the dependence of air spring parameters on throttle element pneumatic resistance value. <strong>Methodology.</strong> The work presents the elaborated model of the air spring as a dynamic system with three phase coordinates (cylinder pressure, auxiliary reservoir pressure, cylinder air mass). Stiffness and viscosity coefficients were determined on the basis of system respon

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Maulik, Romit, and Omer San. "Dynamic modeling of the horizontal eddy viscosity coefficient for quasigeostrophic ocean circulation problems." Journal of Ocean Engineering and Science 1, no. 4 (2016): 300–324. http://dx.doi.org/10.1016/j.joes.2016.08.002.

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Piekart, Jakub, and Justyna Łuczak. "Transport properties of microemulsions with ionic liquid apolar domains as a function of ionic liquid content." RSC Advances 6, no. 95 (2016): 92605–20. http://dx.doi.org/10.1039/c6ra13061e.

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The conductivity, dynamic viscosity and diffusion coefficient of aqueous ionic liquid microemulsions were measured as a function of ionic liquid content. The conclusions from transport properties were supported by UV-Vis as well as FTIR measurements.

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AKHAVAN, R., A. ANSARI, S. KANG, and N. MANGIAVACCHI. "Subgrid-scale interactions in a numerically simulated planar turbulent jet and implications for modelling." Journal of Fluid Mechanics 408 (April 10, 2000): 83–120. http://dx.doi.org/10.1017/s0022112099007582.

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The dynamics of subgrid-scale energy transfer in turbulence is investigated in a database of a planar turbulent jet at Reλ ≈ 110, obtained by direct numerical simulation. In agreement with analytical predictions (Kraichnan 1976), subgrid-scale energy transfer is found to arise from two effects: one involving non-local interactions between the resolved scales and disparate subgrid scales, the other involving local interactions between the resolved and subgrid scales near the cutoff. The former gives rise to a positive, wavenumber-independent eddy-viscosity distribution in the spectral space, an

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