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Modelling of mass transport in watercourses considering mass transfer between phases in unsteady states. Part II. Mass transport during absorption and adsorption processes

Bielski A.

Environment Protection Engineering

2011

Vol. 37, nr 4

71-89

Equations describing the rate of adsorption and absorption processes and those based on Whitman's model have been analyzed. In the case of unstable states, the mass flux penetrating to the layer of the river sediment and calculated by means of these equations differs from the mass flux calculated from the mass diffusion equation. In order to minimize the discrepancies between the flux determined by Whitman's model and a real flux, the correction factor has been introduced into the concentration gradient equation originated from Whitman's model. This correction factor can be expressed as a time dependence of the product of a certain parameter and the concentration derivative at the phase boundary (solid phase side). The corrected equation for the concentration gradient has been used to derive another equation, describing a general rate of the absorption and adsorption processes at the linear interfacial equilibrium and the chemical reactions occurring in the liquid and solid phases; the chemical reactions follow the first order monomolecular mechanism in unstable states with reference to the liquid phase. Knowing the general rate of the earlier mentioned processes it is possible to construct an advective-dispersion model of mass transport in a river including these particular processes. Such a model contains a term defined as a correction factor referring to the time dependence of the concentration derivative with respect to time. The described model may be also used for simulation of the transport of pollutants undergoing adsorption and absorption in the layer river sediment; the processes occur with a finite and infinitely large rate through the equilibrium states.

Vibration analysis of running-up turbine engine GTD-350

Cioch W., Krzyworzeka P.

Diagnostyka

2007

nr 4(44)

125-130

The article contains the example of practical application of the procedure for non-stationary signals processing developed at Department of Mechanics and Vibroacoustics University of Science and Technology (AGH). The developed method - Procedure of Linear Decimation (PLD) was applied for signal analysis of vibrations of GTD-350 turbine engine in unstable operating conditions. As a reference signal the rotational speed of driving shaft was adapted. The results were enclosed for turbine running-up and coasting state.

W artykule przedstawiono przykład praktycznego zastosowania opracowanej w Katedrze Mechaniki i Wibroakustyki Akademii Górniczo-Hutniczej procedury przetwarzania sygnałów niestacjonarnych. Opracowaną metodę - Procedurę Liniowej Decymacji (PLD) zastosowano do analizy sygnałów drgań silnika turbinowego GTD-350 w nieustalonych stanach pracy. Jako sygnał referencyjny przyjęto prędkość obrotową wału napędowego. Wyniki przedstawiono dla stanu rozbiegu i wybiegu turbiny.