Wszystkie pola: convection - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effects of rotation on Jeffrey nanofluid flow saturated by a porous medium
Autorzy:: Rana, Gian C.
Powiązania:: https://bibliotekanauki.pl/articles/1839839.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: nanofluid
Jeffrey model
convection
porous medium
rotation
nanopłyn
model Jeffreya
konwekcja
medium porowate
rotacja
Opis:: In this paper, the effects of rotation on a Jeffery nanofluid flow in a porous medium which is heated from below is studied. Darcy model is employed for porous medium and the Jeffrey fluid model is used as a base fluid. The Navier-Stokes equations of motion of fluid are modified under the influence of the Jeffrey parameter, naoparticles and rotation. The basic perturbation technique based on normal modes is applied to derive the dispersion relation for a Rayleigh number. The effects of the Taylor number, Jeffrey parameter, Lewis number, modified diffusivity ratio, nanoparticles Rayleigh number and medium porosity on the stationary convection of the physical system have been analyzed analytically and graphically. It is observed that the rotation parameter has a stabilising influence for both bottom/top-heavy configurations.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 17-29
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Thermo-diffusion MHD convection in enclosure using heat and mass lines visualization techniques
Autorzy:: Kushawaha, Durgesh
Yadav, Sushil
Singh, Dwesh K.
Behera, Pravata Kumar
Powiązania:: https://bibliotekanauki.pl/articles/2175525.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: thermodiffusion
heatlines
masslines
magnetic field
overall heat
mass transfer
termodyfuzja
pole magnetyczne
transport masy
Opis:: The numerical study of two-dimensional laminar thermo-diffusion natural convection in an exponentially heated and concentrated square enclosure of unit length in the presence of a uniform horizontal magnetic field is presented in this paper. The left and right vertical walls are assumed to have higher and lower temperatures and concentrations, respectively, and are governed by exponential functions, whereas the horizontal walls are assumed to be adiabatic and non-diffusive. The mathematical formulation of heat and mass functions has been completed, and heat and mass line contours have been drawn based on these functions to investigate the behavior of heat and mass in the cavity. The flow governing equations were solved using a finite difference method in conjunction with the Successive Over-Relaxation (SOR) technique and then converted to a vorticity-stream function form. A detailed comparison of isotherms with heatlines and isosolutes with masslines has been performed. Furthermore, the reduction for lower Rayleigh numbers Ra surpassing the reduction for higher values of Ra. The maximum reduction in overall heat and mass transfer has been observed for higher Hartmann (Ha = 8).
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 2; 63--76
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigation of the influence of liquid phase motion on the solidification process in the three-dimensional region
Autorzy:: Węgrzyn-Skrzypczak, Ewa
Powiązania:: https://bibliotekanauki.pl/articles/1839853.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: Finite Element Method
numerical modelling
solidification
fluid flow
convection
Metoda Elementów Skończonych
modelowanie numeryczne
zestalenie
przepływ cieczy
konwekcja
Opis:: In this paper, the numerical model of solidification process with the motion of the liquid phase is presented. The mathematical description of the considered problem is based on the heat conduction equation with convective term and the Navier-Stokes equations with continuity equation. The numerical model uses the Finite Element Method (FEM). The simulations of the solidification process with or without the fluid motion effect are presented and discussed.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 103-111
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Unsteady mixed convection nonlinear radiative Casson nanofluid flow with convective boundary condition, heat source and inclined magnetic field effects
Autorzy:: Unyong, Bundit
Govindaraju, Mathialagan
Gunasekaran, Nallappan
Vadivel, Rajarathinam
Powiązania:: https://bibliotekanauki.pl/articles/2141509.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: Casson nanofluid
inclined magnetic field
convective boundary conditions
nonlinear thermal radiation
Opis:: In this paper, we have studied the effect of heat source/sink on unsteady Casson nanofluid past a stretching surface with mixed convection inclined magnetic field and nonlinear thermal radiation numerically. Brownian and thermophoresis effects are studied in this nanofluid model (Buongiorno’s). The governing momentum, energy, and concentration equations are PDEs that are changed into ordinary differential equations by means of suitable transformations. The fourth-order R-K method with shooting technique is adapted to yield the results of this work. The velocity, thermal, and concentration profiles are discussed with the several physical parameters. Also, skin friction, the Nusselt number, and the Sherwood number are examined with the help of the table. It is found that the enhancing value of the unsteady parameter and heat sink parameters reduce the fluid temperature, and the enhancing value of the Casson parameter and heat source parameters increase the fluid temperature. The increasing value of the inclined magnetic field parameter enhances the thermal boundary layer thickness.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 65-76
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:: The impact of variable fluid properties on natural convection flow past a vertical cone
Autorzy:: Srinivasacharya, Darbhasayanam
Rajender, Bhanoth
Powiązania:: https://bibliotekanauki.pl/articles/2202044.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: viscous fluid
vertical isothermal cone
successive linearization
Chebyshev collocation method and frequency equation
ciecz lepka
pionowy stożek izotermiczny
linearyzacja sukcesywna
metoda kolokacji Czebyszewa
Opis:: A free convective flow of an incompressible viscous fluid past an isothermal vertical cone is investigated with variable viscosity and variable thermal conductivity. The constant wall temperature (CWT) and constant wall heat flux (CHF) conditions are used as temperature boundary conditions at the surface of the cone. The successive linearization method is applied to linearize the governing nonlinear differential equations of the flow. The numerical solution for the resulting linear equations is attained through the Chebyshev spectral collocation method. The impact of significant parameters on the velocity and temperature, in addition to heat and mass transfer rates, is evaluated and represented graphically for the CWT and CHF situations. The local heat transfer rate decreases, and the coefficient of the skin friction increases with an increase in the viscosity and thermal conductivity parameters for CWT conditions, but the reverse trend is noticed for CHF conditions.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 4; 73--85
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Unsteady MHD natural convective boundary layer flow and heat transfer over a truncated cone in the presence of pressure work
Autorzy:: Ajay, C. K.
Srinivasa, A. H.
Powiązania:: https://bibliotekanauki.pl/articles/122607.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: convection
pressure work
truncated cone
MHD
Prandtl number
przepływ konwekcyjny
konwekcja
stożek ścięty
liczba Prandtla
wymiana ciepła
Opis:: The aim of the present paper is to analyse the effect of MHD on unsteady natural convection boundary layer flow and heat transfer over a truncated cone in the presence of pressure work. Suitable transformation is utilized to form a system of coupled non-linear partial differential equations for governing both the flow and heat transfer. These equations have been solved numerically by utilizing an implicit finite difference scheme along with quasilinearization method. Here, the computed numerical results are displayed graphically in terms of the local Nusselt number, skin friction, temperature distribution, and velocity distribution for various values of the magnetic and pressure work parameters along with the fixed Prandtl number
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 1-16
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Unsteady MHD natural convective boundary layer flow and heat transfer over a truncated cone in the presence of pressure work
Autorzy:: Ajay, C. K.
Srinivasa, A. H.
Powiązania:: https://bibliotekanauki.pl/articles/1839804.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: convection
pressure work
truncated cone
MHD
Prandtl number
przepływ konwekcyjny
konwekcja
stożek ścięty
liczba Prandtla
wymiana ciepła
Opis:: The aim of the present paper is to analyse the effect of MHD on unsteady natural convection boundary layer flow and heat transfer over a truncated cone in the presence of pressure work. Suitable transformation is utilized to form a system of coupled non-linear partial differential equations for governing both the flow and heat transfer. These equations have been solved numerically by utilizing an implicit finite difference scheme along with quasilinearization method. Here, the computed numerical results are displayed graphically in terms of the local Nusselt number, skin friction, temperature distribution, and velocity distribution for various values of the magnetic and pressure work parameters along with the fixed Prandtl number
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 5-16
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Magnetoconvection of nanofluid in a partially heated cavity with isothermal blockage
Autorzy:: Nagaraj, Suresh
Nagarajan, Nithyadevi
Powiązania:: https://bibliotekanauki.pl/articles/2175528.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: Al2O3 nanofluid
finite volume method
inclined magnetic field
isothermal square body
natural convection
partial bottom heating
nanopłyn Al2O3
metoda objętości skończonych
nachylone pole magnetyczne
konwekcja naturalna
Opis:: Natural convection characteristics of Al2O3-water nanofluid in a cavity is investigated numerically under the influence of a inclined magnetic field. The bottom wall is partially heated, and the top wall is cooled and the remaining regions of the cavity are kept adiabatic. An isothermally heated square blockage of the different rectangular size is placed at the centre of the cavity. The schematic model is converted into mathematical form, and the non-dimensional equations are discretized by the finite volume method using power law scheme and solved by Semi-Implicit Method for Pressure Linked Equation algorithm. The relevant parameters such as Rayleigh number (104-106), Hartmann numer (10-500), size of blockage ratio (0.25-0.75), length of the heat source (0.25-1.0) and inclination angle of the magnetic field (0°-90° on the flow and temperature fields are examined. Results are presented in terms of streamlines, isotherms, velocity profile, local and average Nusselt number. It was found that for low Hartmann numbers, the average heat transfer rate attained the maximum at the inclined magnetic field of γ = 45°. In addition, the blockage ratio of B = 0.75 enhanced the higher heat transfer rate for all values of γ.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 2; 77--90
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Heat transfer analysis of non-Newtonian natural convective fluid flow using Homotopy Perturbation and Daftardar-Gejiji & Jafari Methods
Autorzy:: Adeleye, Olurotimi
Yinusa, Ahmed
Powiązania:: https://bibliotekanauki.pl/articles/122431.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: non-Newtonian fluid
natural convection
vertically infinite plates
Daftardar-Gejiji & Jafari Method
DJM
Homotopy Perturbation Method
HPM
ciecz nieniutonowska
konwekcja naturalna
metoda Daftardar-Gejiji i Jafari
metoda perturbacji homotopii
Opis:: In this paper, the analytical solution of natural convective heat transfer of a non-Newtonian fluid flow between two vertical infinite plates using the Homotopy Perturbation Method (HPM) and Daftardar-Gejiji & Jafari Method (DJM) is presented. The heat transfer problem of natural convection is observed in many engineering fields including geothermal systems, heat exchangers, petroleum reservoirs, nuclear waste reserves, etc. The problem which is modelled as fully coupled nonlinear ordinary differential equations requires special analytical techniques for its solution. The solutions are obtained using an exact analytical method: the Homotopy Perturbation Method (HPM) and a semi-analytical method: the Daftardar-Gejiji & Jafari Method (DJM). These solutions are compared with solutions obtained from the Runge-Kutta numerical method. The results are in good agreement with the numerical solutions. The effects of the Eckert number, Prandtl number and the non-Newtonian fluid viscosity parameter on the non-dimensional temperature and velocity of the fluid are investigated. The results obtained from the analytical method show that the method can be applied to predict excellent results of the problem and can be used for parametric studies of the problem. From the results, it is shown that when the Prandtl number and the Eckert number are increased, there is an increase in both temperature and fluid flow velocity.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 2; 5-18
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

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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