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    Wyświetlanie 1-15 z 15
    Tytuł:
    Radiative flow past a parabolic started isothermal vertical plate with uniform mass diffusion
    Autorzy:
    Muthucumaraswamy, R.
    Lakshmi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/955181.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    promieniowanie
    izoterma
    płyta pionowa
    wymiana ciepła
    wymiana masy
    parabolic
    radiation
    isothermal
    vertical plate
    heat and mass transfer
    Opis:
    A theoretical solution of thermal radiation effects on an unsteady flow past a parabolic starting motion of an infinite isothermal vertical plate with uniform mass diffusion has been studied. The plate temperature as well as the concentration level near the plate are raised uniformly. The dimensionless governing equations are solved using the Laplace-transform technique. The fluid considered here is a gray, absorbing-emitting radiation but a non-scattering medium. The effects of velocity profiles are studied for different physical parameters such as the thermal radiation parameter, thermal Grashof number, mass Grashof number and Schmidt number. It is observed that the velocity increases with increasing values the thermal Grashof number or mass Grashof number. The trend is just reversed with respect to the thermal radiation parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 195-202
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient free convective radiative flow between vertical parallel plates heated/cooled asymmetrically with heat generation and slip condition
    Autorzy:
    Gaur, P. K.
    Sharma, R. P.
    Jha, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/264930.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    wytwarzanie ciepła
    promieniowanie cieplne
    MHD
    slip flow
    heat generation
    thermal radiation
    Opis:
    Investigation of an MHD convective flow of viscous, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel porous plates is carried out. Forchheimer-Brinkman extended Darcy model is assumed to simulate momentum transfer within the porous medium. A magnetic field of uniform strength is applied normal to the plates. The analytical results are evaluated numerically and the presented graphically to discuss in detail the effects of different parameter entering into the problem.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 365-384
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemically reacting ionized radiative fluid flow through an impulsively started vertical plate with induced magnetic field
    Autorzy:
    Ahmed, T.
    Alam, M. M.
    Ferdows, M.
    Tzirtzilakis, E. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/264343.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    warstwa graniczna
    promieniowanie
    pole magnetyczne
    gaz zjonizowany
    boundary layer
    radiative flow
    strong magnetic field
    ionized gas
    flow field
    Opis:
    Numerical studies have been performed to examine the chemically reacting ionized fluid flow through a vertical plate with induced magnetic field. This study is performed for the cooling problem. To obtain the nondimensional non-similar momentum, the induced magnetic field, energy and concentration equations, usual nondimensional variables have been used. The numerical solutions for the velocity fields, induced magnetic fields, temperature distribution as well as concentration distribution are obtained for associated parameters using the explicit finite difference method. The local and average shear stresses, current densities, Nusselt number as well as the Sherwood number are also investigated. The obtained results are discussed with the help of graphs to observe effects of various parameters entering into the problem. Also the stability conditions of the explicit finite difference method are analyzed. Finally, a qualitative comparison of the present results with previously published results has been made.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 5-36
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A numerical study of dissipative chemically reactive radiative MHD flow past a vertical cone with nonuniform mass flux
    Autorzy:
    Sambath, P.
    Sankar, D. S.
    Viswanathan, K. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265381.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    swobodna konwekcja
    promieniowanie cieplne
    lepkość
    magnetohydrodynamika
    free convection
    finite difference
    vertical cone
    MHD
    thermal radiation
    viscous dissipation
    Opis:
    A computational model is presented to explore the properties of heat source, chemically reacting radiative, viscous dissipative MHD flow of an incompressible viscous fluid past an upright cone under inhomogeneous mass flux. A numerical study has been carried out to explore the mass flux features with the help of Crank-Nicolson finite difference scheme. This investigation reveals the influence of distinct significant parameters and the obtained outputs for the transient momentum, temperature and concentration distribution near the boundary layer is discussed and portrayed graphically for the active parameters such as the Schmidt number Sc, thermal radiation Rd, viscous dissipation parameter […], chemical reaction parameter […], MHD parameter M and heat generation parameter ]…]. The significant effect of parameters on shear stress, heat and mass transfer rates are also illustrated.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 159-176
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic and radiative Casson fluid flow over a permeable vertical Riga-plate
    Autorzy:
    Loganathan, Parasuraman
    Deepa, Krishnamurthy
    Powiązania:
    https://bibliotekanauki.pl/articles/281626.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Casson fluid
    Riga plate
    wall parallel Lorentz force
    electromagnetism
    Opis:
    The convective Casson fluid flow past a Riga plate is investigated theoretically. The flow properties are elucidated through the analytical solutions of transport equations which are acquired by adopting the Laplace transform technique. This study mainly focuses on nonlinear flow characteristics under radiation, permeability and the wall parallel Lorentz force. The positive modified Hartmann number refers to the aiding flow which enhances the flow speed. The comparison between Newtonian and non-Newtonian fluid flow subject to the wall parallel Lorentz force has also been done graphically. Further, the results of this Casson fluid flow model correlated with the vertical flow under buoyancy effect.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 987-998
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady MHD thermal diffusive and radiative fluid flow past a vertical porous plate with chemical reaction in slip flow regime
    Autorzy:
    Ravi Kumar, D.
    Jayarami Reddy, K.
    Raju, M. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/265452.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    swobodna konwekcja
    magnetohydrodynamika
    przenoszenie ciepła
    dyfuzja termiczna
    promieniowanie
    reakcja chemiczna
    poślizg
    MHD
    free convection
    heat and mass transfer
    slip flow regime
    thermal diffusion
    radiation
    chemical reaction
    Opis:
    An analytical solution of an MHD free convective thermal diffusive flow of a viscous, incompressible, electrically conducting and heat-absorbing fluid past a infinite vertical permeable porous plate in the presence of radiation and chemical reaction is presented. The flow is considered under the influence of a magnetic field applied normal to the flow. The plate is assumed to move with a constant velocity in the direction of fluid flow in slip flow regime, while free stream velocity is assumed to follow the exponentially increasing small perturbation law. The velocity, temperature, concentration, skin friction, Nusselt number and Sherwood number distributions are derived and have shown through graphs and tables by using the simple perturbation technique.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 117-129
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiative Falkner-Skan flow of Walter-B fluid with prescribed surface heat flux
    Autorzy:
    Hayat, T.
    Qayyum, S.
    Imtiaz, M.
    Alsaedi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949144.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Walter-B fluid
    Falkner-Skan flow
    prescribed surface heat flux
    thermal radiation
    Opis:
    This article addresses the Falkner-Skan flow of an incompressible Walter-B fluid. Fluid flow is caused by a stretching wedge with thermal radiation and prescribed surface heat flux. Appropriate transformations are used to obtain the system of nonlinear ordinary differen- tial equations. Convergent series solutions are obtained by the homotopy analysis method. Influence of pertinent parameters on the velocity, temperature and Nusselt number are in- vestigated. It is observed that by increasing the viscoelastic parameter, the fluid velocity decreases. There is an enhancement of the heat transfer rate for the viscoelastic parameter and power law index. It is also found that the Prandtl number and radiation parameter decrease the heat transfer rate.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 117-127
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Investigations of Couette flow unsteady radiative convective heat transfer in a vertical channel using the generalized method of lines (MOL)
    Autorzy:
    Sowayan, Ahmed S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174210.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    promieniowanie
    konwekcja naturalna
    metoda Runge-Kutty
    vertical channel
    radiation
    natural convection
    method of lines (MOL)
    Runge-Kutta method
    Opis:
    This study describes a very efficient and fast numerical solution method for the non-steady free convection flow with radiation of a viscous fluid between two infinite vertical parallel walls. The method of lines (MOL) is used together with the Runge-Kutta ODE Matlab solver to investigate this problem numerically. The presence of radiation adds more stiffness and numerical complexity to the problem. A complete derivation in dimensionless form of the governing equations for momentum and energy is also included. A constant heat flux condition is applied at the left wall and a transient numerical solution is obtained for different values of the radiation parameter (R). The results are presented for dimensionless velocity, dimensionless temperature and Nusselt number for different values of the Prandtl number (Pr), Grashof number (Gr), and the radiation parameter (R). As expected, the results show that the convection heat transfer is high when the Nusselt number is high and the radiation parameter is low. It is also shown that the solution method used is simple and efficient and could be easily adopted to solve more complex problems.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 199--211
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of chemical reaction on magneto-micropolar fluid flow from a radiative surface with variable permeability
    Autorzy:
    Sharma, B. K.
    Singh, A. P.
    Yadav, K.
    Chaudhary, R. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/264925.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    reakcja chemiczna
    płyn mikropolarny
    magnetohydrodynamika
    wymiana ciepła
    chemical reaction
    micropolar fluid
    microrotation
    magnetohydrodynamics
    heat and mass transfer
    Opis:
    This paper presents a study of a hydromagnetic free convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with a heat source, taking into account the homogeneous chemical reaction of first order. A uniform magnetic field has also been considered in the study which acts perpendicular to the porous surface of the above plate. The analysis has been done by assuming varying permeability of the medium and the Rosseland approximation has been used to describe the radiative heat flux in the energy equation. Numerical results are presented graphically in the form of velocity, micro- rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters. The study clearly demonstrates how a chemical reaction influences the above parameters under given conditions.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 833-851
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of slip velocity in a magneto-micropolar fluid flow from a radiative surface with variable permeability: a numerical study
    Autorzy:
    Sharma, B. K.
    Tailor, V.
    Goyal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265273.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    slip velocity
    chemical reaction
    micropolar fluid
    MHD
    heat and mass transfer
    FDM
    poślizg
    reakcja chemiczna
    płyn mikropolarny
    magnetohydrodynamika
    przenoszenie ciepła
    Opis:
    An analysis is presented to describe the hydromagnetic mixed convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with radiation and slip flow regime. A uniform magnetic field has been considered in the study which absorbs the micropolar fluid with a varying suction velocity and acts perpendicular to the porous surface of the above plate. The governing non-linear partial differential equations have been transformed into linear partial differential equations, which are solved numerically by applying the explicit finite difference method. The numerical results are presented graphically in the form of velocity, micro-rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 637-651
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD natural convection flow with radiative heat transfer past an impulsively moving vertical plate with ramped temperature in the presence of hall current and thermal diffusion
    Autorzy:
    Seth, G. S.
    Mahato, G. K.
    Sarkar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/955266.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja naturalna
    dyfuzja termiczna
    promieniowanie cieplne
    MHD natural convection
    Hall current
    ramped temperature
    thermal diffusion
    thermal radiation
    Opis:
    An investigation on an unsteady MHD natural convection flow with radiative heat transfer of a viscous, incompressible, electrically conducting and optically thick fluid past an impulsively moving vertical plate with ramped temperature in a porous medium in the presence of a Hall current and thermal diffusion is carried out. An exact solution of momentum and energy equations, under Boussinesq and Rosseland approximations, is obtained in a closed form by the Laplace transform technique for both ramped temperature and isothermal plates. Expressions for the skin friction and Nusselt number for both ramped temperature and isothermal plates are also derived. The numerical values of fluid velocity and fluid temperature are displayed graphically versus the boundary layer coordinate y for various values of pertinent flow parameters for both ramped temperature and isothermal plates. The numerical values of the skin friction due to primary and secondary flows are presented in tabular form for various values of pertinent flow parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1201-1220
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of radiative heat transfer impact in cross-flow tube and fin heat exchangers
    Autorzy:
    Hanuszkiewicz-Drapała, M.
    Bury, T.
    Widziewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240216.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat exchangers
    radiative heat transfer
    numerical model
    experimental validation
    wymienniki ciepła
    radiacyjna wymiana ciepła
    model numeryczny
    weryfikacja doświadczalna
    Opis:
    A cross-flow, tube and fin heat exchanger of the water – air type is the subject of the analysis. The analysis had experimental and computational form and was aimed for evaluation of radiative heat transfer impact on the heat exchanger performance. The main element of the test facility was an enlarged recurrent segment of the heat exchanger under consideration. The main results of measurements are heat transfer rates, as well as temperature distributions on the surface of the first fin obtained by using the infrared camera. The experimental results have been next compared to computational ones coming from a numerical model of the test station. The model has been elaborated using computational fluid dynamics software. The computations have been accomplished for two cases: without radiative heat transfer and taking this phenomenon into account. Evaluation of the radiative heat transfer impact in considered system has been done by comparing all the received results.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 1; 99-112
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie przepływu strumienia ciepła od promieniowania słonecznego przez szyby o różnych charakterystykach radiacyjnych
    Solar radiation heat flow measurement through different radiative properties glazing
    Autorzy:
    Nowak, Ł.
    Nowak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/362868.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    przepływ ciepła przez szyby
    charakterystyki radiacyjne szyb
    szkło barwione
    powłoki na szybach
    badania doświadczalne
    heat flow by windows panel
    radiational characteristic of window panel
    stained glass
    coat in windows panel
    experimental studies
    Opis:
    Wymiana ciepła przez część przezierną przegród przezroczystych stanowi istotny element bilansu cieplnego budynku, zarówno jako składnik pożądanych zysków cieplnych w okresie zimowym jak i zysków niepożądanych, które mogą prowadzić do przegrzewania się pomieszczeń w okresie letnim [1]. Różne rodzaje szyb charakteryzują się różnym poziomem przepuszczanie energii słonecznej do wnętrza budynku. W artykule przedstawiono analizę wyników pomiarów gęstości strumienia ciepła przepływającego przez przegrodę przezroczystą pochodzącą głównie z promieniowania słonecznego, a także zmiany temperatury wewnątrz kaset pomiarowych w zależności od typu zastosowanego oszklenia.
    Heat flow through visible part of glazed facades is an important part of whole building energy balance. It could be a part of preferable solar heat gains in the winter but could also lead to room overheating in the summer. Different radiative properties of glazing have an important influence of transmitted solar energy amount to the building interior. The description of heat flow measurements, effects on measuring box air temperature and its conclusions are presented in the paper.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2009, T. 4; 147-152
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oscillatory fluid flow and heat transfer through porous medium between parallel plates with inclined magnetic field, radiative heat flux and heat source
    Autorzy:
    Mehta, T.
    Mehta, R.
    Mehta, A
    Powiązania:
    https://bibliotekanauki.pl/articles/265399.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    ciało porowate
    promieniowanie
    źródło ciepła
    oscillatory
    inclined magnetic field
    porous medium
    radiation
    heat source
    skin-friction coefficient and Nusselt number
    Opis:
    The aim of the paper is to investigate an oscillatory fluid flow and heat transfer through a porous medium between parallel plates in the presence of an inclined magnetic field, radiative heat flux and heat source. It is assumed that electrical conductivity of the fluid is small and the electromagnetic force produced is very small. The governing coupled equations of motion and energy are solved analytically. Numerical results for the velocity and temperature profiles, local skin friction coefficient and local Nusselt number for various values of physical parameters are discussed numerically and presented graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 88-102
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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