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1
Prof. Eugeniusz Kamiński (1923-1995)
Kamiński J., Pokorski J.
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
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2015
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z. 4/104
5--7
2
Content available Pomiary właściwości płynów nienewtonowskich lepkosprężystych metodą mikroreologii optycznej
Pela J., Prokopek M., Dziubiński M.
Inżynieria i Aparatura Chemiczna
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2014
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Nr 5
360--362
PL
W pracy przedstawiono podstawy teoretyczne pomiarów właściwości reologicznych płynów metodą mikroreologii optycznej. Wykonano pomiary właściwości reologicznych wody oraz roztworu PAA Praestol. Uzyskano zadowalającą zgodność między wynikami pomiarów metodą mikroreometrii optycznej i reometrii rotacyjnej.
EN
Theoretical basis of measurements of rheological properties of liquid by optical microrheology method have been presented. An experimental results of rheological properties of water and solution of PAA Praestol were carried out. A satisfactory agreement between experimental results concerning rheological properties of water and PAA Praestol by two methods optical microrheology and rotational rheometer have been obtained.
3
Content available remote Thermal instability of Rivlin-Ericksen elasto-viscous rotating fluid permeating with suspended particles under variable gravity field in porous medium
Rana G. C., Kumar S.
Studia Geotechnica et Mechanica
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2010
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Vol. 32, nr 4
39-54
EN
The problem of thermal instability of the Rivlin-Ericksen elasto-viscous fluid in a porous medium is considered in the presence of uniform rotation, suspended particles and variable gravity field. The rotation, gravity field, suspended particles and viscoelasticity introduce oscillatory modes. It is found that the principle of the exchange of stabilities is valid, provided that some condition is fulfilled. In a stationary convection, suspended particles are found to have destabilizing effect on the system, while rotation has stabilizing effect on the system under certain conditions. The effect of rotation, suspended particles, and medium permeability have also been shown graphically.
4
Content available remote Stability of stratified Oldroydian fluid in hydromagnetics in presence of suspended particle in porous medium
Singh V., Dixit S.
Studia Geotechnica et Mechanica
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2010
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Vol. 32, nr 4
55-65
EN
In the present note, the stability of stratified Oldroyd viscoelastic fluid in the presence of suspended particles and variable magnetic field in porous medium has been studied. The case of exponentially varying density, viscosity, magnetic field and suspended particles is considered. The system is found to be unstable for the disturbances of all wave numbers for potentially unstable stratification. The effect of variable horizontal, magnetic field has been discussed in the note. The growth rate decreases or increases with the increase in particle density and kinematic viscosity; similarly, the growth rate increases or decreases with an increase in medium permeability and strain retardation time.
5
Content available remote Stability of stratified elasto-viscous Walters' (Model B') fluid in the presence of horizontal magnetic field and rotation
Sharma V., Gupta U.
Studia Geotechnica et Mechanica
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2010
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Vol. 32, nr 2
41-53
EN
The effect of horizontal magnetic field is considered on the stability of stratified viscoelastic Walters' (Model B') fluid in the presence of rotation. In contrast to the Newtonian fluids, the system is found to be unstable for small wavelength perturbations for the case of stable stratification. It is also found that the magnetic field stabilizes the certain wave-number band for unstable stratification in the presence of rotation and this wave - number range increases with the increase in magnetic field and decreases with the increase in kinematic visco-elasticity.
6
Content available remote On the stability of two stratified Walters B' viscoelastic superposed fluids
Kumar P., Singh G. J.
Studia Geotechnica et Mechanica
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2010
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Vol. 32, nr 4
29-37
EN
The stability of the plane interface separating two Walters B' viscoelastic fluids has been studied. The density, viscosity and viscoelasticity are assumed to be exponentially varying. For stable stratifications, the system is found to be stable or unstable under certain conditions. The system is found to be unstable for unstable stratifications. Also the growth rates are found to decrease as well as increase with the increase in kinematic viscosity and kinematic viscoelasticity. The effect of a variable horizontal magnetic field is also considered. For the stable stratifications, in the hydromagnetic case also, the system is found to be stable or unstable under certain conditions. However, for the unstable stratifications, the magnetic field has got stabilizing effects.
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