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1
Content available Computer modelling of the dynamic system «porous medium – moisture – chemical substance» in the case of soil desalinization by rainfalls (a three-dimensional case)
Kozhushko Oksana D, Martyniuk Petro M.
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
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2018
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nr 21
47--60
EN
Mathematical model of moisture transport taking into account variable porosity has been investigated numerically. Changes in porosity are caused by dissolution of chemical substances associated with soil skeleton. The finite element solution of the problem in the case of regular rainfall has been found. Program realization of the corresponding algorithms has been implemented in FreeFem++ computational environment. Numerical experiments have been carried out and the impact of rainfall on desalinization of soil with high concentration of salts in the solid component has been determined.
PL
Numerycznie badano model matematyczny transportu wilgoci o zmiennej porowatości. Zmiany porowatości są spowodowane rozpuszczaniem substancji chemicznych związanych ze szkieletem gruntu. Znaleziono numeryczne rozwiązanie problemu w przypadku regularnych opadów. Programowa realizacja odpowiednich algorytmów została zaimplementowana w środowisku obliczeniowym FreeFem++. Przeprowadzono eksperymenty numeryczne i określono wpływ opadów na odsalanie gruntu przy wysokim stężeniu soli w twardym komponencie.
2
Content available Initial unsteady free convective flow past an infinite vertical plate with radiation and mass transfer effects
Khan A., Solanki R.
International Journal of Applied Mechanics and Engineering
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2017
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Vol. 22, no. 4
931--943
EN
An exact solution and analysis of an initial unsteady two dimensional free convection flow, heat and mass transfer in the presence of thermal radiation along an infinite fixed vertical plate when the plate temperature is instantaneously raised, is presented. The fluid considered is a gray, absorbing emitting radiation but a nonscattering medium. Three cases have been discussed, in particular, namely, (i) when, the plate temperature is instantaneously raised to a higher constant value, (ii) when, the plate temperature varies linearly with time and (iii) when, the plate temperature varies non-linearly with time. A close form general solution for all the cases has been obtained in terms of repeated integrals of error functions. In two particular cases, the solutions in terms of the repeated integrals of error functions have been further simplified to forms containing only error functions. It is observed that for an increase in the radiation parameter N or a decrease in the Grashof number Gr or Gm, there is a fall in the velocity or temperature, but compared to the no radiation case or no diffusing species, there is a rise in the velocity and temperature of the fluid.
3
Content available Badanie przenoszenia ciepła i masy w chłodziarkach adsorpcyjnych
Gwadera M., Kupiec K.
Inżynieria i Aparatura Chemiczna
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2014
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Nr 4
245--246
PL
W pracy przedstawiono wyniki badań doświadczalnych dotyczących adsorpcji w ziarnach adsorbentu naniesionych na powierzchnię rurki metalowej. Taka konstrukcja jest stosowana w adsorpcyjnych urządzeniach chłodniczych. Badania prowadzono w układzie silikażel – para wodna. Stosowano różne natężenia przepływu fazy gazowej i różne wielkości ziaren. Stwierdzono znaczny wpływ prędkości przepływu fazy gazowej na przebieg procesu.
EN
The experimental study results on adsorption in adsorbent pellets spread directly on a metal pipe surface are presented in the paper. Such construction is used in adsorption chillers. A silica gel - water vapour system was studied. Different gas phase flow rates and different sizes of silica gel pellets were used. It was found that gas phase velocity significantly influenced the process.
4
Content available Closed form solutions of heat and mass transfer in the flow of a MHD visco-elastic fluid over a porous stretching sheet
Ashokkunar K., Veena P. H., Pravin V. K.
International Journal of Applied Mechanics and Engineering
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2013
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Vol. 18, no. 4
989--1002
EN
The problem of heat and mass transfer in a visco-elastic fluid flow over a stretching sheet in the presence of a uniform magnetic field is examined. The important physical quantities such as the skin friction coefficient, heat transfer co-efficient and the mass transfer co-efficient are determined. It is found that the heat and mass transfer distribution decreases with the increasing values of the visco-elastic parameter k1.
5
Content available remote Wpływ natężenia przepływu gazu na maksymalną temperaturę ziaren adsorbentu
Gwadera M., Kupiec K., Komorowicz T.
Czasopismo Techniczne. Chemia
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2012
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R. 109, z. 1-Ch
29--40
PL
W artykule wyznaczano maksymalne temperatury osiągane przez ziarna adsorbentu w trakcie pochłaniania składnika mieszaniny gazowej. Do obliczeń wykorzystano trzy modele procesu o różnym stopniu złożoności. Otrzymane wyniki obliczeń porównano z wartościami wyznaczonymi eksperymentalnie. Przeanalizowano wpływ natężenia przepływu gazu na maksymalną temperaturę, jaką osiągają ziarna adsorbentu. Stwierdzono różny kierunek wpływu natężenia przepływu gazu dla ziaren pojedynczych i dla ziaren znajdujących się w złożu.
EN
Maximal temperatures reached by adsorbent pellets during adsorption of a gas mixture component have been determined in this work. Three process models of varying complexity have been used for calculations. The obtained results have been compared with values determined experimentally. The influence of a gas flow rate on the maximal temperature reached by adsorbent pellets was analysed. It was found that this influence is different for single pellets and pellets in a bed.
6
Content available remote Similarity analysis in MHD heat and mass transfer of non-Newtonian power law fluids past a semi-infinite flat plate
Patel M., Timol M. G.
International Journal of Applied Mechanics and Engineering
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2010
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Vol. 15, no 4
1205-1214
EN
A steady three dimensional MHD free convection and mass transfer flow past a semi-infinite surface in the presence of heat generation has been studied numerically for non-Newtonian power law fluids. The governing partial differential equations are reduced to a system of an ordinary differential equation using similarity transformation.
7
Content available remote Non-Darcy mixed convection heat and mass transfer from a vertical wavy surface in porous media
Mohamed R. A., Mahdy A.
International Journal of Applied Mechanics and Engineering
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2009
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Vol. 14, no 3
813-827
EN
This paper reports a study of mixed convection heat and mass transfer from a vertical wavy surface embedded in a homogeneous fluid-saturated porous medium using the Forchheimer flow model. The buoyancy effect is due to the variation of temperature and concentration across the boundary layer. We consider the boundary-layer regime where the Péclet number is very lager, […]. Appropriate transformations are employed to transform the governing partial differential equations into the boundary layer equations. The transformed equations have been solved numerically employing the Runge Kutta integration scheme with the shooting technique. Extensive computations are presented for a wide range of wave amplitudes the mixed convection parameter inertial parameter […] the Lewis number and the buoyancy ratio The numerical results illustrating the effects of all previously involved parameters on the velocity profiles[…] temperature […] mass […] the local Nusselt number […] and the local Sherwood number […] are presented and discussed in detail.
8
Content available remote Effects of heat and mass transfer on a moving vertical cylinder with chemically reactive species diffusion
Ganesan P., Loganathan P.
International Journal of Applied Mechanics and Engineering
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2003
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Vol. 8, no 2
195-205
EN
A numerical analysis is carried out to examine the combined heat and mass transfer along with chemical reaction characteristics in a free convective flow over a moving semi-infinite vertical cylinder. The governing equations are solved using an implicit finite difference scheme of Crank-Nicolson type. The effects of the chemical reaction in transient velocity, temperature, concentration, local and average skin-friction, Nusselt number and Sherwood number profiles are illustrated and discussed for various physical parametric values. It is observed that with an increase in the chemical reaction parameter K or the Schmidt number Sc, velocity decreases, but velocity increases with an increasing thermal Grashof number Gr or mass Grashof number Gc. The surface mass transfer strongly depends on the Schmidt number and the chemical reaction and it decreases with their increasing values.
9
Modelowanie migracji zanieczyszczeń w gruncie z uwzględnieniem procesu adsorpcji
Aniszewski A.
Prace Naukowe Politechniki Szczecińskiej. Katedra Inżynierii Środowiska Wodnego
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2001
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Nr 559(2)
5-95
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