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Wyświetlanie 1-15 z 51
Tytuł:
Effect of induced magnetic field on MHD mixed convection flow in vertical microchannel
Autorzy:
Jha, B. K.
Aina, B.
Powiązania:
https://bibliotekanauki.pl/articles/265764.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
microchannel
transverse magnetic field
induced magnetic field
velocity slip
temperature jump
pole magnetyczne
skok temperatury
mikrokanał
Opis:
The present work presents a theoretical investigation of an MHD mixed convection flow in a vertical microchannel formed by two electrically non-conducting infinite vertical parallel plates. The influence of an induced magnetic field arising due to motion of an electrically conducting fluid is taken into consideration. The governing equations of the motion are a set of simultaneous ordinary differential equations and their exact solutions in dimensionless form have been obtained for the velocity field, the induced magnetic field and the temperature field. The expressions for the induced current density and skin friction have also been obtained. The effects of various non-dimensional parameters such as rarefaction, fluid wall interaction, the Hartmann number and the magnetic Prandtl number on the velocity, the induced magnetic field, the temperature, the induced current density, and skin friction have been presented in a graphical form. It is found that the effect of the Hartmann number and magnetic Prandtl number on the induced current density is found to have a decreasing nature at the central region of the microchannel.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 567-582
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer effects on free convection of viscous dissipative fluid flow over an inclined plate with thermal radiation in the presence of induced magnetic field
Autorzy:
Kumar, P. Pramod
Malga, Bala Siddulu
Appidi, Lakshmi
Matta, Sweta
Powiązania:
https://bibliotekanauki.pl/articles/1839898.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie cieplne
pole magnetyczne
konwekcja swobodna
thermal radiation
induced magnetic field
magnetic Prandtl number
free convection
Galerkin finite element method
viscous dissipation
Opis:
The principal objective of the present paper is to know the reaction of thermal radiation and the effects of magnetic fields on a viscous dissipative free convection fluid flow past an inclined infinite plate in the presence of an induced magnetic field. The Galerkin finite element technique is applied to solve the nonlinear coupled partial differential equations and effects of thermal radiation and other physical and flow parameters on velocity, induced magnetic field, along with temperature profiles are explained through graphs. It is noticed that as the thermal radiation increases velocity and temperature profiles decrease and the induced magnetic field profiles increases.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 122-134
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On thermal instability of Kuvshiniski fluid with suspended particles saturated in a porous medium in the presence of a magnetic field
Autorzy:
Singh, M.
Powiązania:
https://bibliotekanauki.pl/articles/265476.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
thermal convection
Kuvshiniski fluid
suspended particles
magnetic field
porous medium
Opis:
The thermal instability of a Kuvshiniski viscoelastic fluid is considered to include the effects of a uniform horizontal magnetic field, suspended particles saturated in a porous medium. The analysis is carried out within the framework of the linear stability theory and normal mode technique. For the case of stationary convection, the Kuvshiniski viscoelastic fluid behaves like a Newtonian fluid and the magnetic field has a stabilizing effect, whereas medium permeability and suspended particles are found to have a destabilizing effect on the system, oscillatory modes are introduced in the system, in the absence of these the principle of exchange of stabilities is valid. Graphs in each case have been plotted by giving numerical values to the parameters, depicting the stability characteristics. Sufficient conditions for the avoidance of overstability are also obtained.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 981-994
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slip effects on squeezing flow of nanofluid between two parallel disks
Autorzy:
Das, K.
Jana, S.
Acharya, N.
Powiązania:
https://bibliotekanauki.pl/articles/264490.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
tarcie
poślizg
nanofluid
slip effect
squeezing flow
magnetic field
Opis:
In this study, the influence of temperature and wall slip conditions on the unsteady flow of a viscous, incompressible and electrically conducting nanofluid squeezed between two parallel disks in the presence of an applied magnetic field is investigated numerically. Using the similarity transformation, the governing coupled partial differential equations are transformed into similarity non-linear ordinary differential equations which are solved numerically using the Nachtsheim and Swigert shooting iteration technique together with the sixth order Runge-Kutta integration scheme. The effects of various emerging parameters on the flow characteristics are determined and discussed in detail. To check the reliability of the method, the numerical results for the skin friction coefficient and Nusselt number in the absence of slip conditions are compared with the results reported by the predecessors and an excellent agreement is observed between the two sets of results.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 5-20
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation effects on MHD flow past an impulsively started infinite vertical plate with mass diffusion
Autorzy:
Chandrakala, P.
Narayana Bhaskar, P.
Powiązania:
https://bibliotekanauki.pl/articles/955319.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
pole magnetyczne
płyta pionowa
radiation
magnetic field
vertical plate
finite differences
Opis:
The effects of thermal radiation on a flow past an impulsively started infinite vertical plate in the presence of a magnetic field have been studied. The fluid considered is a gray, absorbing-emitting radiation but non-scattering medium. The dimensionless governing equations are solved by an efficient, more accurate, unconditionally stable and fast converging implicit scheme. The effects of velocity and temperature for different parameters such as the thermal radiation, magnetic field, Schmidt number, thermal Grashof number and mass Grashof number are studied. It is observed that the velocity decreases in the presence of thermal radiation or a magnetic field.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 17-26
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of magnetic field on thermosolutal instability of rotating ferromagnetic fluid under varying gravity field
Autorzy:
Pundir, S. K.
Nadian, P. K.
Pundir, R.
Powiązania:
https://bibliotekanauki.pl/articles/1839899.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyn ferromagnetyczny
pole magnetyczne
namagnesowanie
thermosolutal instability
ferromagnetic fluid
rotation
magnetic field
magnetization
Opis:
This paper deals with the theoretical investigation of the effect of a magnetic field, rotation and magnetization on a ferromagnetic fluid under varying gravity field. To find the exact solution for a ferromagnetic fluid layer contained between two free boundaries, we have used a linear stability analysis and normal mode analysis method. For the case of stationary convection, a stable solute gradient has a stabilizing effect, while rotation has a stabilizing effect if 0λ > and destabilizing effect if 0λ < . Further, the magnetic field is discovered to have both a stabilizing and destabilizing effect for both 0λ > and 0λ < . It is likewise discovered that magnetization has a stabilizing effect for both 0λ > and 0λ < in the absence of the stable solute gradient. Graphs have been plotted by giving numerical values of various parameters. In the absence of rotation, magnetic field and stable solute gradient, the principle of exchange of stabilities is found to hold true for certain conditions.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 201-214
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferrofluid flow due to a rotating disk in the presence of a non-uniform magnetic field
Autorzy:
Bhandari, A.
Kumar, V.
Powiązania:
https://bibliotekanauki.pl/articles/265387.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
siła magnesowania
pole magnetyczne
ciecz ferromagnetyczna
magnetization force
ferrofluid
rotating disk
magnetic field
Opis:
The flow of a ferrofluid due to a rotating disk in the presence of a non-uniform magnetic field in the axial direction is studied through mathematical modeling of the problem. Contour and surface plots in the presence of 10 kilo-ampere/meter, 100 kilo-ampere/meter magnetization force are presented here for radial, tangential and axial velocity profiles, and results are also drawn for the magnetic field intensity. These results are compared with the ordinary case where magnetization force is absent.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 273-283
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Possibility to Use Modified Flight Ash as a Neutralizer in the Acid Soils Reclamation Processes
Możliwość zastosowania pyłu lotnego jako neutralizatora w procesach rekultywacji gleb kwaśnych
Autorzy:
Ćwiąkała, M.
Greinert, A.
Kostecki, J.
Rafalski, L.
Powiązania:
https://bibliotekanauki.pl/articles/396282.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fly ash
magnetic activator
reclamation
soil neutralization
pył lotny
aktywator magnetyczny
rekultywacja
neutralizacja gleb
Opis:
Using the alkaline fly ash after combustion of lignite as the acid soils neutralizer is a technique known for decades. Due to many disadvantages of the direct fly ash application it is sought to modify this material prior to its use. The process of fly ash modification in the magnetic activator involved breaking up fly ash to small grain sizes in order to obtain a material with a very large specific surface and modified properties. The purpose of the research was to compare the properties of unmodified fly ash with those of ash modified in the magnetic activator in terms of its usefulness in the neutralization of acidic soils. Unmodified fly ash was classified as a medium-grained calciferous material. The basic components of ash were silicates (33.28% of SiO2) and calcium compounds (31.26% of CaO). It has a low heavy metal content falling within a range characteristic of coal ash and meeting soil quality standard requirements. As a result of activation, the following changes were obtained in the properties of modified ash compared with unmodified ash: sand fraction content – reduced to 0.40, silt fraction content – increased by 1.40, silt fraction content – increased by 1.68, content of the sum of the dust and silt fractions – increased by 1.49, specific surface – increased by 1.65, fineness – reduced by 0.48. Modification of fly ash in the magnetic activator was found to have improved the physical properties of ash as acidic soil neutralizer, and its chemical properties make such an application possible.
Wykorzystanie alkalicznego popiołu lotnego po spalaniu węgla brunatnego jako neutralizatora gleb kwaśnych to technika znana od dziesięcioleci. Ze względu na wiele wad bezpośredniego stosowania popiołu lotnego dąży się do modyfikacji tego materiału przed jego użyciem. Proces modyfikacji popiołów lotnych w aktywatorze magnetycznym polegał na rozbiciu popiołów lotnych na małe ziarna w celu uzyskania materiału o bardzo dużej powierzchni właściwej i zmodyfikowanych właściwościach. Celem badań było porównanie właściwości niezmodyfikowanego popiołu lotnego z właściwościami modyfikowanego popiołu w aktywatorze magnetycznym pod względem jego przydatności do neutralizacji kwaśnych gleb. Niezmodyfikowany popiół lotny został sklasyfikowany jako średnio ziarnisty materiał wapienny. Podstawowymi składnikami popiołu były krzemiany (33,28% SiO2) i związki wapnia (31,26% CaO). Odznacza się niską zawartością metali ciężkich, mieszczącą się w zakresie charakterystycznym dla popiołu węglowego spełniając wymagania normy jakości gleby. W wyniku aktywacji uzyskano następujące zmiany we właściwościach zmodyfikowanego popiołu w porównaniu z popiołem niemodyfikowanym: zawartość frakcji piaskowej – zmniejszona do 0,40, zawartość frakcji pylistej – zwiększona o 1,40, zawartość frakcji pylastej – zwiększona o 1,68, zawartość sumy frakcji pyłu i mułu – zwiększona o 1,49, powierzchnia właściwa – zwiększona o 1,65, rozdrobnienie – zmniejszona o 0,48. Stwierdzono, że modyfikacja popiołu lotnego w aktywatorze magnetycznym poprawiła właściwości fizyczne popiołu jako środka neutralizującego glebę, a jego właściwości chemiczne umożliwiają takie zastosowanie.
Źródło:
Civil and Environmental Engineering Reports; 2018, No. 28(4); 88-104
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of modulation on heat transport by a weakly nonlinear thermal instability in the presence of applied magnetic field and internal heating
Autorzy:
Manjula, S. H.
Kiran, Palle
Narsimlu, G.
Roslan, R.
Powiązania:
https://bibliotekanauki.pl/articles/1839705.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modulacja
pole magnetyczne
ogrzewanie
Ginzburg-Landau equation
temperature modulation
applied magnetic field
internal heating
Opis:
The present paper deals with a weakly nonlinear stability problem under an imposed time-periodic thermal modulation. The temperature has two parts: a constant part and an externally imposed time-dependent part. We focus on stationary convection using the slow time scale and quantify convective amplitude through the real Ginzburg-Landau equation (GLE). We have used the classical fourth order Runge-Kutta method to solve the real Ginzburg-Landau equation. The effect of various parameters on heat transport is discussed through GLE. It is found that heat transport analysis is controlled by suitably adjusting the frequency and amplitude of modulation. The applied magnetic field (effect of Ha) is to diminish the heat transfer in the system. Three different types of modulations thermal, gravity, and magnetic field have been compared. It is concluded that thermal modulation is more effective than gravity and magnetic modulation. The magnetic modulation stabilizes more and gravity modulation stabilizes partially than thermal modulation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 96-115
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soret and Dufour effects on MHD micropolar fluid flow over a linearly stretching sheet, through a non-Darcy porous medium
Autorzy:
Reddy, G. V. R.
Krishna, Y. H.
Powiązania:
https://bibliotekanauki.pl/articles/265236.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ magnetohydrodynamiczny
parametr magnetyczny
warstwa graniczna
MHD flow
magnetic parameter
Dufour number
Soret number
Opis:
In this paper, we discuss the Soret and Dufour effects on an MHD micropolar fluid flow over a linearly stretching sheet, through a non-Darcy porous medium, where stretching velocity of the sheet varies linearly with distance from the origin, and, temperature and concentration vary non-linearly in the boundary layer region. By suitable similarity transformations, the governing boundary layer equations are transformed to ordinary differential equations. These equations are solved by numerical computations with bvp4c along with the shooting technique method. The effects of the magnetic parameter, Soret number and Dufour number on velocity profiles, microrotation profile, heat transfer, and concentration, skin-friction, Nusselt number and Sherwood number are computed, discussed and analysed numerically and presented through tables and graphs.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 485-502
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of magnetic field dependent viscosity on ferromagnetic convection in a rotating sparsely distributed porous medium - revisited
Autorzy:
Prakash, J.
Kumar, P.
Manan, S.
Sharma, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/265547.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ferrofluid
konwekcja
pole magnetyczne
materiał porowaty
convection
rotation
magnetic field dependent viscosity
porous medium
Opis:
The effect of magnetic field dependent (MFD) viscosity on the thermal convection in a ferrofluid layer saturating a sparsely distributed porous medium has been investigated by using the Darcy-Brinkman model in the simultaneous presence of a uniform vertical magnetic field and a uniform vertical rotation. A correction is applied to the study of Vaidyanathan et al. [11] which is very important in order to predict the correct behavior of MFD viscosity. A linear stability analysis has been carried out for stationary modes and oscillatory modes separately. The critical wave number and critical Rayleigh number for the onset of instability, for the case of free boundaries, are determined numerically for sufficiently large values of the magnetic parameterM1 . Numerical results are obtained and are illustrated graphically. It is shown that magnetic field dependent viscosity has a destabilizing effect on the system for the case of stationary mode and a stabilizing effect for the case of oscillatory mode, whereas magnetization has a destabilizing effect.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 142-158
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modeling of convective heat and mass transfer of a rotating nano-fluid bounded by stretching and stationary walls in a vertical conduit
Autorzy:
Haritha, B.
Umadevi, C.
Dhange, M. Y.
Powiązania:
https://bibliotekanauki.pl/articles/1839699.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
termoforeza
ruchy Browna
Brownian motion
magnetic field
stretching wall
vertical conduit
thermophoresis
Opis:
The influence of thermal emission and unvarying magnetic field of convective heat and mass transfer of a rotating nano-liquid in an upright conduit constrained by a stretching and motionless wall is studied. The temperature, concentration profile, primary and secondary velocities have been computed through similarity transformation and fourth-order Runge-Kutta shooting technique. The objective of this article is to measure the impact of emission constraint, Brownian movement constraint and Eckert number, thermophoresis constraint, Prandtl number, space, and temperature-dependent heat source constraint on velocity. The results are presented in tables and graphs. Further, various constraint impacts on the skin friction coefficient, heat and mass transfer rates are also explored. This work is pertinent to biotechnological and engineering uses, like mass and heat transfer enhancement of microfluids and design of bioconjugates.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 69-83
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MHD flow of Walters’ liquid B over a nonlinearly stretching sheet
Autorzy:
Siddheshwar, P. G.
Mahabaleshwar, U. S.
Chan, A.
Powiązania:
https://bibliotekanauki.pl/articles/265047.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analytical solution
magnetic field
nonlinear stretching sheet
Walters' liquid B
pole magnetyczne
blacha
rozciąganie blachy
Opis:
The paper discusses the boundary layer flow of a weak electrically conducting viscoelastic Walters’ liquid B over a nonlinearly stretching sheet subjected to an applied transverse magnetic field, when the liquid far awal from the surface is at rest. The stretching is assumed to be a quadratic function of the coordinate along the direction of stretching. An analytical expression is obtained for the stream function and velocity components as a function of the viscoelastic parameter, the Chandrasekhar number and stretching related parameters. The results have possible technological applications in liquid based systems involving stretchable materials.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 589-603
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laminar mixed convection flow from a vertical surface with induced magnetic field and convective boundary
Autorzy:
Chaudhary, K.
Sharma, A.
Jha, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/264352.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie cieplne
absorpcja promieniowania
pole magnetyczne
thermal radiation
radiation absorption
convective boundary
induced magnetic field
Opis:
The objective of this investigation is to study the influence of thermal radiation and radiation absorption parameter on a mixed convection flow over a continuously moving porous vertical plate under the action of transverse applied magnetic field taking into account the induced magnetic field with convective boundary. Under certain assumptions, the solutions for the velocity field, temperature distribution and induced magnetic field are obtained. The influences of various parameters on the velocity, temperature fields and on induced magnetic fields are studied graphically. It is also found that the dimensionless Prandtl number, Grashof number, Schmidt number and magnetic parameter have an appreciable influence on the independent variables.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 307-326
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Newtonian momentum transfer past an isothermal stretching sheet with applied suction
Autorzy:
Veena, P. H.
Suresh, B.
Pravin, V. K.
Goud, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/264590.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
non-Newtonian fluid
magnetic field
permeability
effect of viscoelasticity
płyn nieniutonowski
pole magnetyczne
przepuszczalność
lepkosprężystość
Opis:
The paper discusses the flow of an incompressible non-Newtonian fluid due to stretching of a plane elastic surface in a saturated porous medium in the approximation of boundary layer theory. An exact analytical solution of non-linear MHD momentum equation governing the self-similar flow is given. The skin friction co-efficient decreases with an increase in the visco-elastic parameter k1 and increase in the values of both the magnetic parameter and permeability parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 665-674
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

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