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1
Content available Omezení prašnosti na důlních pracovištích
Gibesová B., Urban P., Hrůzek Z., Košňovský V.
Systemy Wspomagania w Inżynierii Produkcji
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2016
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z. 1 (13)
65--72
EN
An important and most frequently used means of dust disposal in mines is water spray. Recently, it was found that its efficient operation depends on the relation between the size of the dust grains and water drops. The article gives examples showing that at the current level of water jet design, this requirement is not met. This leads to the conclusion that it is necessary to develop a new type of nozzles.
CS
Jako důležitý a nejčastěji využívaný prostředek ke zneškodňování prachu na důlních pracovištích je vodní postřik. V poslední době bylo zjištěno, že pro jeho efektivní působení musí být relace mezi velikosti prachových zrn a vodních kapek. V článku jsou uvedeny příklady, že při stávající úrovni konstukce vodních trysek, není tento požadavek zajištěn. To vede k závěru o nutnosti vyvinout nový typ trysek.
2
Content available Effect of hall currents on thermal instability of dusty couple stress fluid
Aggarwal A. K., Verma A.
Archives of Thermodynamics
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2016
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Vol. 37, no. 3
3--18
EN
In this paper, effect of Hall currents on the thermal instability of couple-stress fluid permeated with dust particles has been considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For the case of stationary convection, dust particles and Hall currents are found to have destabilizing effect while couple stresses have stabilizing effect on the system. Magnetic field induced by Hall currents has stabilizing/destabilizing effect under certain conditions. It is found that due to the presence of Hall currents (hence magnetic field), oscillatory modes are produced which were non-existent in their absence.
3
Content available An analysis on the velocity of dust particles in the plate-type electrostatic precipitators used in thermoelectric power plants
Popa G. N., Şora I., Dinis C. M., Deaconu S. I.
Environment Protection Engineering
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2014
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Vol. 40, nr 1
85--102
EN
Experimental data collected from different plate-type electrostatic precipitators used in a thermoelectric power plant has been analyzed. The following parameters were considered: the collection efficiency, average migration velocity of dust particles, velocity distribution of the gas in the input and output channels of precipitators. The average migration velocity of dust particles can be estimated using various mathematical models, and the gas velocity can be computed using the velocity distributions from the input channels of the precipitators. The traveling time of dust particles between the electrodes is smaller than the traveling time along the precipitator sections.
4
Content available remote Effect of dust particles on a Soret- driven ferrothermohaline convection in a rotating medium
Hemalatha R., Sekar R., Vaidyanathan G.
International Journal of Applied Mechanics and Engineering
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2012
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Vol. 17, no. 2
367-381
EN
In ferrofluids three components namely, the core, surfactant and carrier fluids coexist. Thermal convection in a multicomponent fluid has wide applications in industrial, ionospheric and geothermal systems. In this paper the effect of dust particles on a Soret-driven ferrothermohaline convection in a rotating system heated and soluted from below subjected to a transverse uniform magnetic field is examined using linear stability analysis. An exact solution is obtained for the case of two free boundaries. Both stationary and oscillatory instabilities are investigated. The oscillatory modes are introduced due to the presence of dust particles, the stable solute gradient and rotation and the oscillatory modes are not allowed in their absence. In the case of stationary convection, the non-buoyancy magnetization parameter, the dust particle parameter destabilize the system. The Soret-coefficient, rotation and the stable solute gradient stabilize the system. The results are presented graphically.
5
Content available remote Effect of rotation on a Soret-driven thermohaline convection in dusty ferrofluids saturating a porous medium
Hemalatha R., Sekar R., Vaidyanathan G.
International Journal of Applied Mechanics and Engineering
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2011
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Vol. 16, no 4
1021-1036
EN
Soret driven thermoconvective instability in multicomponent fluids has wide applications in heat and mass transfer. This paper deals with the theoretical investigation of the effect of rotation on a Soret-driven ferrothermohaline convection heated and soluted from below subjected to a transverse uniform magnetic field in the presence of dust particles saturating a porous medium. Brinkmann model is used. An exact solution is obtained for the case of two free boundaries. Both stationary and oscillatory instabilities are investigated using the linear stability analysis and normal mode technique. The oscillatory modes are introduced due to the presence of dust particles, the stable solute gradient and rotation and the oscillatory modes are not allowed in their absence. For the case of stationary convection, the non-buoyancy magnetization parameter, the dust particle parameter and large values of permeability of the porous medium destabilize the system. The soret coefficient, rotation and the stable solute gradient stabilize the system. The results are presented graphically.
6
Content available remote Effect of presence of dust particles on soret-driven ferrothermohaline convection
Sekar R., Vaidyanathan G., Hemalatha R.
International Journal of Applied Mechanics and Engineering
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2009
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Vol. 14, no 2
509-522
EN
Soret driven thermoconvective instability in multicomponent fluids has wide applications in heat and mass transfer. This paper deals with the theoretical investigation of the effect of dust particles on Soret-driven thermohaline convection in a ferrofluid, heated and soluted from below subjected to a transverse uniform magnetic field. An exact solution is obtained for the case of two free boundaries. A linear stability analysis is used. A normal mode technique is applied. Both stationary and oscillatory instabilities are investigated. It is found that the system stabilizes through stationary mode. The non-buoyancy magnetization parameter and the dust particle parameter are found to destabilize the system. The Soret coefficient and the stable solute gradient tend to stabilize the system. The results are presented graphically.
7
Content available remote Soret-driven thermohaline convection in dusty ferrofluids saturating a porous medium
Sekar R., Vaidyanathan G., Hemalatha R.
International Journal of Applied Mechanics and Engineering
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2008
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Vol. 13, no 4
1003-1018
EN
The Soret driven thermoconvective instability in multicomponent fluids has wide applications in heat and mass transfer. This paper deals with the theoretical investigation of the effect of dust particles on a Soret-driven ferro thermohaline convection heated and soluted from below subjected to a transverse uniform magnetic field in a porous medium. The Brinkmann model is used. An exact solution is obtained for the case of two free boundaries. Both stationary and oscillatory instabilities are investigated using the linear stability analysis and normal mode technique. It is found that the system stabilizes only through stationary mode. The non-buoyancy magnetization parameter, the dust particle parameter and large values of permeability of the porous medium are found to destabilize the system. The Soret coefficient and the stable solute gradient stabilize the system. The results are presented graphically.
8
Content available remote Effect of magnetic field dependent viscosity and rotation on ferrothermohaIine convection in the presence of dust particIes
Sunil, Sharma A., Shandil R. G.
International Journal of Applied Mechanics and Engineering
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2007
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Vol. 12, no 1
197-213
EN
This paper deals with the theoretical investigation of the combined effect of magnetic field dependent (MFD) viscosity and rotation on ferrothermohaline convection in the presence of dust particles subjected to a transverse uniform magnetic field. For a flat fluid layer contained between two free boundaries, an exact solution is obtained using a linearized stability theory and normal mode analysis method. The cases of stationary convection and oscillatory modes have been discussed. In this paper, an attempt is also made to obtain the sufficient conditions for the non-existence of overstability.
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