Temat: zmienna lepkość - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of lubricant compressibility and variable viscosity on the performance of three-lobe journal bearing
Autorzy:: Mahdi, Mushrek A.
Abass, Basim Ajeel
Powiązania:: https://bibliotekanauki.pl/articles/2172770.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hydrodynamic lubrication
journal bearing
compressibility effect
variable viscosity
smarowanie hydrodynamiczne
łożysko
zmienna lepkość
Opis:: Different configurations of journal bearings have been extensively used in turbo- machinery and power generating equipment. Three-lobe bearing is used due to its lower film temperature and stable operation. In this study, static performance of such a bearing has been investigated at different eccentricity ratios considering lubricant compressibility and variable viscosity. The effect of variable viscosity was considered by taking the viscosity as a function of the oil film thickness while Dowson model is used to consider the effect of lubricant compressibility. The effect of such parameters was considered to compute the oil film pressure, load-carrying capacity, attitude an- gle and oil side leakage for a bearing working at (ε from 0.6 to 0.8) and (viscosity coefficient from 0 to 1). The mathematical model as well as the computer program prepared to solve the governing equations were validated by comparing the pressure distribution obtained in the present work with that obtained by EL-Said et al. A good agreement between the results has been observed with maximum deviation of 3%. The obtained results indicate a decrease in oil film pressure and load-carrying capacity with the higher values of viscosity coefficient while the oil compressibility has a little effect on such parameters.
Źródło:: Archive of Mechanical Engineering; 2022, LXIX, 2; 203--219
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simultaneous effects of heat transfer and variable viscosity on peristaltic transport of casson fluid flow in an inclined porous tube
Autorzy:: Manjunatha, G.
Rajashekhar, C.
Vaidya, H.
Prasad, K. V.
Powiązania:: https://bibliotekanauki.pl/articles/266265.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: liczba Darcy'ego
zmienna lepkość
granica plastyczności
Darcy number
thermal slip
velocity slip
variable viscosity
yield stress
Opis:: The present study investigates the combined effects of varying viscosity and heat transfer on a Casson fluid through an inclined porous axisymmetric tube in the presence of slip effects. The modeled governing equations are solved analytically by considering the long wavelength and small Reynolds number approximations. The numerical integration is employed to obtain pressure rise and frictional force. A parametric analysis has been presented to study the effects of the Darcy number, angle of inclination, varying viscosity, velocity slip, thermal slip, yield stress, amplitude ratio, Prandtl number and Eckert number on the pressure rise, pressure gradient, streamlines, frictional force and temperature. The study reveals that an increase in the angle of inclination and viscosity parameter has a proportional increase in the pressure rise. Also, an increase in the porosity causes a significant reduction in the pressure rise.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 309-328
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of variable viscosity on free flow of non-Newtonian power-law fluids along a vertical surface with thermal stratification
Autorzy:: Moorthy, M.
Senthilvadivu, K.
Powiązania:: https://bibliotekanauki.pl/articles/240778.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ośrodek porowaty
stratyfikacja termiczna
swobodna konwekcja
zmienna lepkość
free convection
non-Newtonian
porous medium
thermal stratification
variable viscosity
Opis:: The aim of this paper is to investigate the effect of thermal stratification together with variable viscosity on free convection flow of non-Newtonian fluids along a nonisothermal semi infinite vertical plate embedded in a saturated porous medium. The governing equations of continuity, momentum and energy are transformed into nonlinear ordinary differential equations using similarity transformations and then solved by using the Runge-Kutta-Gill method along with shooting technique. Governing parameters for the problem under study are the variable viscosity, thermal stratification parameter, non-Newtonian parameter and the power-law index parameter.The velocity and temperature distributions are presented and discussed. The Nusselt number is also derived and discussed numerically.
Źródło:: Archives of Thermodynamics; 2012, 33, 4; 109-121
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Mixed convective flow with variable viscosity and variable thermal conductivity in a channel in the presence of first order chemical reaction with heat generation or absorption
Autorzy:: Shobha, K. C.
Biradar, Mahadev
Mallikarjun B, Patil
Powiązania:: https://bibliotekanauki.pl/articles/1839861.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: mixed convection
variable viscosity
variable thermal conductivity
first order chemical reaction
heat generation/absorption
konwekcja mieszana
zmienna lepkość
zmienna przewodność cieplna
wytwarzanie ciepła
absorpcja ciepła
Opis:: A study has been made on the flow and heat transfer of a viscous fluid in a vertical channel with first order chemical reaction and heat generation or absorption assuming that the viscosity and thermal conductivity are dependent on the fluid temperature. The temperature of the walls is maintained constant. Under these assumptions, the governing balance equations of mass, momentum and energy are formulated. The dimensionless forms of the governing equations are coupled and non-linear, which cannot be solved analytically and therefore require the use of the Runge-Kutta fourth order along with shooting technique. Graphs for velocity and temperature under different values of parameters involved are plotted and discussed. The skin friction and Nusselt number on the channel walls are also computed and discussed. Furthermore, the investigation found that variable viscosity and variable thermal conductivity enhance the velocity and temperature of the flow.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 91-102
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effects of variable fluid properties and mixed convection on biomagnetic fluid flow and heat transfer over a stretching sheet in the presence of magnetic dipole
Autorzy:: Murtaza, M. G.
Alam, Jahangir
Tzirtzilakis, E. E.
Shamshuddin, Md.
Ferdows, M.
Powiązania:: https://bibliotekanauki.pl/articles/41191498.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Warszawska, Instytut Techniki Cieplnej
Tematy:: stretching sheet
biomagnetic fluid
magnetohydrodynamic
ferrohydrodynamic
magnetic dipole
magnetization
variable viscosity
thermal conductivity
rozciąganie arkusza
płyn biomagnetyczny
magnetohydrodynamika
ferrohydrodynamika
dipol magnetyczny
namagnesowanie
zmienna lepkość
przewodność cieplna
Opis:: This investigations covers the numerical analysis of a steady biomagnetic fluid flow (BFD) that passed through a two dimensional stretching sheet under the influence of magnetic dipole. The effect of fluid variable viscosity and thermal conductivity are also taken into consideration as assumed to vary as linear function of temperature. Our model mathematically formulated for BFD namely blood which consist of principles of magnetohydrodynamic (MHD) and ferrohydrodynamic (FHD), where blood treated as an electrically conducting fluid as well as polarization. Using similarity transformations, the governing system of partial differential equations are transferred into system of ordinary differential equations (ODE). The resulting coupled non linear ODE is numerically solved by employing bvp4c function technique available in MATLAB software. The effects of pertinent parameters namely ferromagnetic interaction parameter, magnetic field parameter, mixed convection parameter, viscosity variation parameter, Prandtl number, thermal conductivity parameter etc are plotted and discussed adequately for velocity and temperature profile as well as skin friction coefficient and rate of heat transfer. The results revels that velocity profile decreases as enhanced values of ferromagnetic number whereas temperature profile increased. Also found that skin friction coefficient reduces and rate of heat transfer increases by increasing values of thermal conductivity parameter and viscosity variation parameter. For numerical validation a comparisons has been made for some specific values with previous investigators. We hope that the present analysis will present in bio-medical and bio-engineering sciences.
Źródło:: Journal of Power Technologies; 2023, 103, 4; 193-208
1425-1353
Pojawia się w:: Journal of Power Technologies
Dostawca treści:: Biblioteka Nauki

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