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Wyświetlanie 1-9 z 9
Tytuł:
Three dimensional flow and mass transfer analysis of a second grade fluid in a porous channel with a lower stretching wall
Autorzy:
Khan, N. A.
Naz, F.
Powiązania:
https://bibliotekanauki.pl/articles/265824.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równania różniczkowe
płyn lepki
pole przepływu
second grade fluid
stretching wall
suction
injection
Opis:
This investigation analyses a three dimensional flow and mass transfer of a second grade fluid over a porous stretching wall in the presence of suction or injection. The equations governing the flow are attained in terms of partial differential equations. A similarity transformation has been utilized for the transformation of partial differential equations into the ordinary differential equations. The solutions of the nonlinear systems are given by the homotopy analysis method (HAM). A comparative study with the previous results of a viscous fluid has been made. The convergence of the series solution has also been considered explicitly. The influence of admissible parameters on the flows is delineated through graphs and appropriate results are presented. In addition, it is found that instantaneous suction and injection reduce viscous drag on the stretching sheet. It is also shown that suction or injection of a fluid through the surface is an example of mass transfer and it can change the flow field.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 359-376
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow features of thermophoretic MHD viscous fluid flow past a converging channel with heat source and chemical reaction
Autorzy:
Kalita, B. K.
Choudhury, R.
Powiązania:
https://bibliotekanauki.pl/articles/2106445.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
płyn lepki
termoforeza
liczba Nusselta
MHD
viscous fluid
heat source
thermophoresis
Nusselt number
skin friction
Opis:
A boundary layer flow of an electrically conducting viscous fluid past a converging channel in the presence of thermophoresis, heat source, chemical reaction, viscous dissipation and simultaneous heat and mass transfer characteristics is studied in the paper. An external magnetic field of uniform strength is applied transversely to the channel. The similarity solution has been used to transform the partial differential equations that represent the problem into a boundary value problem of coupled ordinary differential equations, which in turn are solved numerically using MATLAB’s built in solver bvp4c. Numerical computations are carried out to solve the problem and graphical illustrations are made to get the physical insight of the same. The convergent channel flow problem of an incompressible electrically conducting viscous fluid in the presence of a magnetic field has a wide range of applicability in different areas of engineering, specially in industrial metal casting and control of molten metal flow.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 72--83
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical computation of low Reynolds number viscous flow past bluff bodies
Autorzy:
Tarafder, Md. Shahjada
Mursaline, Miad Al
Powiązania:
https://bibliotekanauki.pl/articles/1839825.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ
płyn lepki
liczba Reynoldsa
współczynnik oporu
viscous flow
low Reynolds number
SIMPLE algorithm
circular cylinder
square cylinder
drag coefficient
Opis:
This article presents a two-dimensional steady viscous flow simulation past circular and square cylinders at low Reynolds numbers (based on the diameter) by the finite volume method with a non-orthogonal body-fitted grid. Diffusive fluxes are discretized using central differencing scheme, and for convective fluxes upwind and central differencing schemes are blended using a ‘deferred correction’ approach. A simplified pressure correction equation is derived, and proper under-relaxation factors are used so that computational cost is reduced without adversely affecting the convergence rate. The governing equations are expressed in Cartesian velocity components and solution is carried out using the SIMPLE algorithm for collocated arrangement of variables. The mesh yielding grid-independent solution is then utilized to study, for the very first time, the effect of the Reynolds number on the separation bubble length, separation angle, and drag coefficients for both circular and square cylinders. Finally, functional relationships between the computed quantities and Reynolds number (Re) are proposed up to Re = 40. It is found that circular cylinder separation commences between Re= 6.5-6.6, and the bubble length, separation angle, total drag vary as Re, Re-0.5, Re-0.5 respectively. Extrapolated results obtained from the empirical relations for the circular cylinder show an excellent agreement with established data from the literature. For a square cylinder, the bubble length and total drag are found to vary as Re and Re-0.666, and are greater than these for a circular cylinder at a given Reynolds number. The numerical results substantiate that a square shaped cylinder is more bluff than a circular one.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 133-157
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady flow through a porous medium due to noncoaxial rotations of a porous disk and a fluid at infinity subjected to a periodic suction
Autorzy:
Guria, M.
Powiązania:
https://bibliotekanauki.pl/articles/265060.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ssanie
lepki płyn
tarcza porowata
periodic suction
non-coaxial
eccentric
oscillating
rotating
Opis:
The unsteady flow of a viscous incompressible fluid due to non-coaxial rotations of a porous disk and a fluid at infinity subjected to a periodic suction through a porous medium has been studied. The velocity field, shear stresses are obtained in closed form. The variations of primary and secondary velocities for different values of non dimensional parameters are depicted in figures.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 401-411
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional MHD boundary layer flow due to an axisymmetric shrinking sheet with radiation, viscous dissipation and heat source/sink
Autorzy:
Madhu, M.
Balaswamy, B.
Kishan, N.
Powiązania:
https://bibliotekanauki.pl/articles/265263.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
lepki płyn
przenoszenie ciepła
axisymmetric shrinking sheet
dual solution
radiation
viscous dissipation
FEM
Opis:
An analysis is made to study a three dimensional MHD boundary layer flow and heat transfer due to a porous axisymmetric shrinking sheet. The governing partial differential equations of momentum and energy are transformed into self similar non-linear ordinary differential equations by using the suitable similarity transformations. These equations are, then solved by using the variational finite element method. The flow phenomena is characterised by the magnetic parameter M, suction parameter S, porosity parameter Kp, heat source/sink parameter Q, Prandtl number Pr, Eckert number Ec and radiation parameter Rd. The numerical results of the velocity and temperature profiles are obtained and displayed graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 393-406
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous chemical reactions effect on dispersion of a solute in peristaltic propulsion of a Newtonian fluid in an inclined channel with wall properties
Autorzy:
Dhange, M. Y.
Sankad, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/266133.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dyspersja
lepki płyn
napęd perystaltyczny
dispersion
inclined channel
viscous fluid
peristaltic propulsion
wall properties
Opis:
In this paper, the dispersion of a solute in the peristaltic propulsion of an incompressible and viscous fluid through a permeable medium under the influence of wall properties with simultaneous homogeneous, heterogeneous chemical reactions in an inclined uniform channel has been studied. The issue is studied through conditions of Taylor’s limit and long wavelength hypothesis. The mean effective coefficient of scattering expression is computed and outcomes are interpreted physically through graphs.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 527-538
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady/steady natural convection flow of reactive viscous fluid in a vertical annulus
Autorzy:
Jha, B. K.
Samaila, A. K.
Ajibade, A. O.
Powiązania:
https://bibliotekanauki.pl/articles/265663.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja naturalna
lepki płyn
egzotermiczna otulina
unsteady/steady natural convection flow
reactive viscous fluid
exothermic
open ended vertical annulus
Opis:
This paper presents both analytical and numerical analyses of a fully developed unsteady/steady natural convection flow of a reactive viscous fluid in an open ended vertical annulus. Analytical expressions for velocity, temperature, skin-friction and rate of heat transfer are obtained after simplifying and solving the governing differential equations with reasonable approximations. The interesting result found in this study is that an increase in non-dimensional time (t) , increases both temperature and velocity profiles until a steady-state value is attained. Subsequent results obtained by numerical calculations show excellent agreement with analytical results.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 73-83
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rotation on the onset of electrohydrodynamic instability of an elastico-viscous dielectric fluid layer
Autorzy:
Rana, G. C.
Chand, R.
Sharma, V.
Powiązania:
https://bibliotekanauki.pl/articles/199843.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Walters' fluid
(model B’ fluid
rotation
AC electric field
electrohydrodynamics
viscosity
viscoelasticity
rotacja
pole elektryczne
elektrohydrodynamika
lepkość
lepkosprężystość
płyn Waltersa
elasto-lepki płyn Waltersa
Opis:
In this paper the combined effect of uniform rotation and AC electric field on the onset of instability in a horizontal layer of an elastico-viscous fluid stimulated by the dielectrophoretic force due to the variation of dielectric constant with temperature is studied. Walters’ (model B’) fluid model is used to describe rheological behaviour of an elastico-viscous fluid. The onset criterions for stationary and oscillatory convection are derived for the case of free-free boundaries. It is observed that Walters’ (model B’) fluid behaves like an ordinary Newtonian fluid and rotation has stabilizing influence whereas AC electric field has destabilizing influence on the stability of the system. The necessary condition for the occurrence of oscillatory convection is also obtained. The present results are in good agreement with the earlier published results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 143-149
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of vortex wake patterns of laminar flow around two side-by-side cylinders
Autorzy:
Nguyen, Van Luc
Ho, Duy Khanh
Powiązania:
https://bibliotekanauki.pl/articles/27309846.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
viscous fluid
vortex shedding
vortex wake pattern
vortex-in-cell method
two side-by-side cylinders
lepki płyn
wir
wzór budzenia wirowego
metoda wirowania w komórce
Opis:
The laminar flow around two side-by-side circular cylinders was numerically investigated using a vortex-in-cell method combined with a continuous-forcing immersed boundary method. The Reynolds number (Re) of the flow was examined in the range from 40 to 200, and the distance between the cylinders varies from 1.2D to 6D, where D is the cylinder diameter. Simulation results show that the vortex wake is classified into eight patterns, such as single-bluff-body, meandering-motion, steady, deflected-in-one-direction, flip-flopping, anti-phase-synchronization, in-phase-synchronization, and phase-difference-synchronization, significantly depending on the Re, the cylinder distance, and the initial external disturbance effects. The anti-phase-synchronization, in-phase-synchronization, and phase-difference-synchronization vortex patterns can be switched at a low Re after a long time evolution of the flow. In particular, the single-bluff-body and flip-flopping vortex patterns excite the oscillation amplitude of the drag and lift coefficients exerted on the cylinders
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 3; 541--565
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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