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Wyszukujesz frazę "thermal instability" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Thermal instability of a heterogeneous Oldroydian viscoelastic fluid heated from below in porous medium
Termiczna niestabilność niejednorodnej lepko-sprężystej cieczy Oldroyda w ośrodku porowatym ogrzewanym od spodu
Autorzy:
Kumar, P.
Mohan, H.
Powiązania:
https://bibliotekanauki.pl/articles/281686.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thermal instability
heterogeneous Oldroydian viscoelastic fluid
porous medium
linear stability theory
Opis:
The thermal instability of an Oldroydian heterogeneous viscoelastic fluid in a porous medium is considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For stationary convection, the medium permeability and density distribution are found to have a destabilizing effect. The dispersion relation is also analyzed numerically. Sufficient conditions for non-existence of overstability are also obtained.
W artykule przedstawiono zagadnienie termicznej niestabilności niejednorodnej cieczy Oldroyda wypełniającej ośrodek porowaty.W wyniku zastosowania zlinearyzowanej teorii stateczności i analizy postaci normalnych określono funkcję dyspersji. Dla stacjonarnej konwekcji stwierdzono, że przepuszczalność ośrodka oraz rozkład gęstości destabilizują ciecz. Funkcję dyspersji wyznaczono także numerycznie. Znaleziono również warunki wystarczające do wykluczenia nadstabilności układu.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 4; 943-951
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the onset of thermal convection in a layer of Oldroydian visco-elastic fluid saturated by Brinkman–Darcy porous medium
Autorzy:
Chand, R.
Powiązania:
https://bibliotekanauki.pl/articles/178803.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
thermal instability
Oldroydian viscoelastic fluid
Brinkman–Darcy number
Prandtl–Darcy number
Opis:
Thermal instability in a horizontal layer of Oldroydian visco-elastic fluid in a porous medium is investigated. For porous medium the Brinkman–Darcy model is considered. A linear stability analysis based upon perturbation method and normal mode technique is used to find solution of the fluid layer confined between two free-free boundaries. The onset criterion for stationary and oscillatory convection is derived analytically. The influence of the Brinkman–Darcy, Prandtl–Darcy number, stress relaxation parameter on the stationary and oscillatory convection is studied both analytically and graphically. The sufficient condition for the validity of PES has also been derived.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 4; 3-10
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of magnetic field on thermal instability of Oldroydian viscoelastic rotating fluid in porous medium
Autorzy:
Thakur, R. C.
Rana, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/265340.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnatyczne
materiały porowate
rotacja
niestabilność termiczna
magnetic field
Oldroydian viscoelastic fluid
porous medium
rotation
thermal instability
Opis:
In this paper, we investigate the effect of a vertical magnetic field on thermal instability of an Oldroydian visco-elastic rotating fluid in a porous medium. By applying the normal mode analysis method, the dispersion relation governing the effects of rotation, magnetic field and medium permeability is derived and solved analytically and numerically. For the case of stationary convection, the Oldroydian viscoelastic fluid behaves like an ordinary Newtonian fluid and it is observed that rotation has a stabilizing effect while the magnetic field and medium permeability have a stabilizing/destabilizing effect under certain conditions on thermal instability of the Oldroydian viscoelastic fluid in a porous medium. The oscillatory modes are introduced due to the presence of rotation, the magnetic field and gravity field. It is also observed that the ‘principle of exchange of stability’ is invalid in the presence of rotation and the magnetic field.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 555-569
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hall effect on thermal instability of viscoelastic dusty fluid in porous medium
Autorzy:
Singh, M.
Gupta, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/265280.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
niestabilność termiczna
płyn lepkosprężysty
porowatość
thermal instability
Rivlin-Ericksen viscoelastic fluid
suspended particles
Hall current effect
porous medium
Opis:
The effect of Hall currents and suspended dusty particles on the hydromagnetic stability of a compressible, electrically conducting Rivlin-Ericksen elastico viscous fluid in a porous medium is considered. Following the linearized stability theory and normal mode analysis the dispersion relation is obtained. For the case of stationary convection, Hall currents and suspended particles are found to have destabilizing effects whereas compressibility and magnetic field have stabilizing effects on the system. The medium permeability, however, has stabilizing and destabilizing effects on thermal instability in contrast to its destabilizing effect in the absence of the magnetic field. The critical Rayleigh numbers and the wave numbers of the associated disturbances for the onset of instability as stationary convection are obtained and the behavior of various parameters on critical thermal Rayleigh numbers are depicted graphically. The magnetic field, Hall currents and viscoelasticity parameter are found to introduce oscillatory modes in the systems, which did not exist in the absence of these parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 871-886
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a couple-stress Rivlin-Ericksen ferromagnetic fluid heated from below with varying gravity, rotation, magnetic field and suspended particles flowing through a porous medium
Autorzy:
Rahul
Sharma, Naveen
Powiązania:
https://bibliotekanauki.pl/articles/2174204.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
niestabilność termiczna
pole magnetyczne
płyn ferromagnetyczny
naprężenie
thermal instability
magnetic field
couple-stress fluid
ferromagnetic fluid
suspended particles
Opis:
The thermal instability of a couple-stress Rivlin-Ericksen ferromagnetic fluid with varying gravity field, suspended particles, rotation and magnetic field flowing through a porous medium is investigated. The dispersion relation has been developed and solved analytically using the normal mode approach and linear stability theory. The effect of suspended particles, rotation, couple stress, permeability and magnetic field on the fluid layer has been investigated. For stationary conventions, it is found that suspended particles always have a destabilizing effect for λ>0 and a stabilizing effect for λ<0 and couple-stress, magnetic field and permeability of the medium have a stabilizing effect on the thermal instability under certain conditions. In the absence of the rotation couple-stress has a stabilizing effect if λ >0 and a destabilizing effect if λ<0. Rotation has a stabilizing effect if λ >0 and a destabilizing effect if λ<0. In the absence of rotation permeability has a stabilizing effect if λ<0 and a destabilizing effect if λ>0. Magnetisation always has a stabilizing effect ( λ>0 or λ<0).
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 177--198
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromagnetic thermal instability of compressible Walters' (Model B') rotating fluid permeated with suspended particles in porous medium
Autorzy:
Rana, G. C.
Jamwal, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/178884.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lepkosprężyste ciecze Walters B
cząstki zawieszone
ośrodek porowaty
niestabilność termiczna
Walters B' viscoelastic fluid
suspended particles
porous medium
thermal instability
Opis:
In this paper, the thermal instability of compressible Walters’ (Model B′) rotating fluid permeated with suspended particles (fine dust) in porous medium in hydromagnetics is considered. By applying normal mode analysis method, the dispersion relation has been derived and solved analytically. It is observed that the rotation, magnetic field, suspended particles and viscoelasticity introduce oscillatory modes. For stationary convection, Walters’ (Model B′) elastico-viscous fluid behaves like an ordinary Newtonian fluid and it is observed that rotation has stabilizing effect, suspended particles are found to have destabilizing effect on the system, whereas the medium permeability has stabilizing or destabilizing effect on the system under certain conditions. The magnetic field has destabilizing effect in the absence of rotation, whereas in the presence of rotation, magnetic field has stabilizing or destabilizing effect under certain conditions.
Źródło:
Studia Geotechnica et Mechanica; 2013, 35, 4; 75-88
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short-term and long-term variability of antenna position due to thermal bending of pillar monument at permanent GNSS station
Autorzy:
Gerhatova, L.
Hefty, J.
Spanik, P.
Powiązania:
https://bibliotekanauki.pl/articles/106753.pdf
Data publikacji:
2016
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
precise inclination sensor observations
GNSS monument instability
thermal deformations
obserwacje
czujnik pochylenia
GNSS
odkształcenia termiczne
Opis:
The variability of daily site coordinates at permanent GNSS station is a sum of many disturbing factors influencing the actual satellite observations, data processing, and bias modelling. In the paper are analysed possibilities of monitoring the instability of GNSS antenna pillar monument by the independent observations using the precise inclination sensor. Long-term series from three different types of pillars show specific features in amplitude and temporal evolution of monument bending. Correlations with daily temperature and/or solar radiation changes were proved.
Źródło:
Reports on Geodesy and Geoinformatics; 2016, 100; 67-77
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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