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1
Analiza usuwania aerozoli z obudowy bezpieczeństwa reaktora jądrowego
100%
Adamski J.
Prace Naukowe Politechniki Warszawskiej. Konferencje
|
2005
|
tom z. 24
5--16
PL
Przedstawiono analizę zachowania się radioaktywnych cząsteczek-aerozoli, wewnątrz obudowy bezpieczeństwa po awarii reaktora jądrowego typu LOCA. Badania dotyczą głównie zachowania się aerozoli pod wpływem koagulacji, oraz usuwania i kondensacji pary na cząsteczkach aerozolowych. Analizowano koagulację Browna, grawitacyjną i turbulentną. Rozważano mechanizmy osadzania, jak sedymentację, osadzanie spowodowane przez dyfuzję, termoforezę i dyfuzjoforezę.
EN
The main phenomena connected with transport and retention of aerosols have been described. The basic data on Brownian, gravitational and turbulent coagulation have been presented. The principal mechanism of deposition of aerosol particles on surfaces, including sedimentatioon, Brownian and Turbulent diffusion, and thermophoresis have been considered. The results of calculation have been shown. In the presented analysis the source term of radinuclide aerosols is due to LOCA accident.
2
Content available Effect of viscous dissipation and thermoporesis on the flow over an exponentially stretching sheet
100%
Srinivasacharya D. , Jagadeeshwar P.
International Journal of Applied Mechanics and Engineering
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2019
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tom Vol. 24, no. 2
425--438
EN
This article analyses the influence of viscous dissipation and thermoporesis effects on the viscous fluid flow over a porous sheet stretching exponentially by applying convective boundary condition. The numerical solutions to the governing equations are evaluated using a local similarity and non-similarity approach along with a successive linearisation procedure and Chebyshev collocation method. The influence of the pertinent parameters on the physical quantities are displayed through graphs.
3
Content available Flow features of thermophoretic MHD viscous fluid flow past a converging channel with heat source and chemical reaction
84%
Kalita B. K. , Choudhury R.
International Journal of Applied Mechanics and Engineering
|
2021
|
tom Vol. 26, no. 3
72--83
EN
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.
4
Content available Heat and mass transfer flow of nanofluids in presence of chemical reaction with partial slip conditions
84%
Narender G. , Govardhan K. , Sreedhar-Sarma G.
Journal of Applied Mathematics and Computational Mechanics
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2020
|
tom Vol. 19, nr 3
71-84
EN
A mathematical model is presented for analyzing the convective fluid over a stretching surface in the presence of nanoparticles. The analysis of heat and mass transfer of converted fluid with slip boundary condition is investigated. To convert the governing Partial Differential Equations (PDEs) into a system of nonlinear Ordinary Differential Equations (ODEs) we use similarity transformations. The shooting method is used to solve the system of ODEs numerically, and obtained numerical results are compared with the published results and found that both are in excellent agreement. The numerical values obtained for the velocity, temperature and concentration profiles are presented through graphs and tables. A discussion on the effects of various physical parameters and heat transfer characteristics is also included.
5
Content available remote Thermophoresis free convection from a vertical cylinder embedded in a porous medium
84%
Chamkha A. J. , Jaradat M. , Pop I.
International Journal of Applied Mechanics and Engineering
|
2004
|
tom Vol. 9, no 3
471-481
EN
This paper deals with the steady free convection over an isothermal vertical circular cylinder embedded in a fluid-saturated porous medium in the presence of the thermophoresis particle deposition effect. The governing partial differential equations are transformed into a set of non-similar equations, which are solved numerically using an implicit finite-difference method. Comparisons with the previously published work are performed and the results are found to be in excellent agreement. Many results are obtained and a representative set of these results is displayed graphically to illustrate the influence of the various physical parameters on the wall thermophoretic deposition velocity and concentration profiles.
6
Content available Mathematical modeling of convective heat and mass transfer of a rotating nano-fluid bounded by stretching and stationary walls in a vertical conduit
84%
Haritha B. , Umadevi C. , Dhange M. Y.
|
2020
|
tom Vol. 25, no. 4
69--83
EN
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.
7
Dynamika aerozoli w obudowie bezpieczeństwa reaktora jądrowego po awarii LOCA
67%
Adamski J.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
|
2006
|
tom Vol. 315, z. 56
19-32
PL
Przedstawiono analizę zachowania się radioaktywnych cząsteczek aerozoli, wewnątrz obudowy bezpieczeństwa, po awarii typu LOCA reaktora jądrowego. Badania dotyczą głównie zachowania się aerozoli pod wpływem koagulacji oraz usuwania i kondensacji pary na cząsteczkach aerozolowych. Analizowano koagulację Browna, grawitacyjną i turbulentną. Badano mechanizmy osadzania, spowodowane przez dyfuzję, termoforezę i dyfuzjoforezę.
EN
The main phenomena connected with transport and retention of aerosols have been described in the paper. The basic data on Brownian, gravitational, and turbulent coagulation have been presented. The principal mechanism of deposition of aerosol particles on surfaces, including sedimentation, Brownian diffusion, turbulent diffusion, and thermophoresis have been considered. Results of calculation have been shown. In the presented analysis the source term of radionuclide aerosols is due to LOCA accident.
8
Content available Melting heat transfer and MHD boundary layer flow of Eyring-Powell nanofluid over a nonlinear stretching sheet with slip
67%
Reddy N. V. B. , Kishan N. , Reddy C. S.
International Journal of Applied Mechanics and Engineering
|
2019
|
tom Vol. 24, no. 1
161--178
EN
The steady laminar incompressible viscous magneto hydrodynamic boundary layer flow of an Eyring- Powell fluid over a nonlinear stretching flat surface in a nanofluid with slip condition and heat transfer through melting effect has been investigated numerically. The resulting nonlinear governing partial differential equations with associated boundary conditions of the problem have been formulated and transformed into a non-similar form. The resultant equations are then solved numerically using the Runge-Kutta fourth order method along with the shooting technique. The physical significance of different parameters on the velocity, temperature and nanoparticle volume fraction profiles is discussed through graphical illustrations. The impact of physical parameters on the local skin friction coefficient and rate of heat transfer is shown in tabulated form.
9
Content available remote A revised model for the effect of nanoparticle mass flux on the thermal instability of a nanofluid layer
67%
Alharbi O. S. , Abdullah A. A.
Demonstratio Mathematica
|
2021
|
tom Vol. 54, nr 1
488--499
EN
A revised model of the nanoparticle mass flux is introduced and used to study the thermal instability of the Rayleigh-Benard problem for a horizontal layer of nanofluid heated from below. The motion of nanoparticles is characterized by the effects of thermophoresis and Brownian diffusion. The nanofluid layer is confined between two rigid boundaries. Both boundaries are assumed to be impenetrable to nanoparticles with their distribution being determined from a conservation condition. The material properties of the nanofluid are allowed to depend on the local volume fraction of nanoparticles and are modelled by non-constant constitutive expressions developed by Kanafer and Vafai based on experimental data. The results show that the profile of the nanoparticle volume fraction is of exponential type in the steady-state solution. The resulting equations of the problem constitute an eigenvalue problem which is solved using the Chebyshev tau method. The critical values of the thermal Rayleigh number are calculated for several values of the parameters of the problem. Moreover, the critical eigenvalues obtained were real-valued, which indicates that the mode of instability is via a stationary mode.
10
Content available Influence of chemical reaction on the heat and mass transfer of nanofluid flow over a nonlinear stretching sheet: a numerical study
67%
Misra S. , Govardhan K.
|
2020
|
tom Vol. 25, no. 2
103--121
EN
A numerical study on a steady, laminar, boundary layer flow of a nanofluid with the influence of chemical reaction resulting in the heat and mass transfer variation is made. The non-linear governing equations with related boundary conditions are solved using Adam’s predictor corrector method with the effect of a Brownian motion and thermophoresis being incorporated as a model for the nanofluid, using similarity transformations. Validation of the current numerical results has been made in comparison to the existing results in the absence of chemical reaction on MHD flows. The numerical solutions obtained for the velocity, temperature and concentration profiles for the choice of various parameters are represented graphically. Variations of heat and mass transfer across a Brownian motion and thermophoresis are studied and analyzed.
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