Wyniki wyszukiwania - BazTech

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Modelowa analiza pracy systemu sczerpywania wolnych produktów naftowych przy różnych wartościach współczynnika filtracji

Knez J.

Gaz, Woda i Technika Sanitarna

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2015

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Nr 12

432--434

PL

Oczyszczanie środowiska gruntowo-wodnego w przypadku występowania zanieczyszczeń dwufazowych woda – produkt naftowy jest dość skomplikowanym procesem. Z tego względu wskazane jest wykonanie badań modelowych, pozwalających oszacować i dobrać odpowiednią pracę systemu technologicznego tak aby zoptymalizować proces oczyszczania. Podczas projektowania systemu technologicznego należy uwzględnić budowę geologiczną, warunki hydrogeologiczne oraz stopień zanieczyszczenia badanego obszaru. Jednym z kluczowych parametrów wpływających na wielkość uzysku produktów naftowych jest współczynnik filtracji warstwy wodonośnej. Uwzględnienie tego parametru przy projetkowaniu systemu technologicznego pozwoli na zwiększenie efektywności pracy całego systemu sczerpywania LNAPL. Celem pracy jest przeprowadzenie analizy wielkości sczerpywanych produktów naftowych w studniach depresyjnych w zależności od różnych wartości współczynnika filtracji. Obliczenia modelowe przeprowadzono przy użyciu programu MARS (Multiple ArealRemediation Simulator). W obliczeniach uwzględniono wielofazowy przepływ powierzchniowy woda-produkt naftowy.

EN

The purification of the soil and water environment in the case of the two-phase water/oil product contamination is a complex process. For this reason, it is advisable to perform the model research, allowing the estimation and selection of an appropriate performance of the technological system to optimize the purification process. The following factors should be taken into consideration while designing the technological system: the geological structure, hydrogeological conditions and the degree of contamination of the study area. One of the key parameters affecting the size of the yield of oil products is a filtration coefficient of the aquifer. The inclusion of this parameter in the design of the technological system will increase the efficiency of the entire LNAPL bailing system. The aim of the study is the model analysis of the oil products bailed out of wells with regard to different values of the permeability coefficient. Model calculations were performed using MARS (Multiple Area Remediation Simulator). The calculations took into account a multiphase surface flow of the water/oil product.

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The influence of chosen calculation parameters on the total volume of the LNAPL product estimated in a mathematical model

Knez J., Knez D.

AGH Drilling, Oil, Gas

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2014

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Vol. 31, no. 4

463--469

EN

There is a number of mathematical models applied to simulate the migration of oil-derived pollution, with the LNAPL (Light non-aqueous phase liquid) volumes in the saturation and aeration zones being analysed in two-phase modeling. A number of hydrogeological parameters and the parameters describing the second phase consisting of oil derivatives are assumed for the sake of the simulation. A part of the data predetermined for the mathematical model is applied on the basis of direct investigations in the field or laboratory, whereas some data are based on a literature analysis or are used by analogy to similar areas. The model data should be additionally verified and validated in the mathematical model. In the case of the LNAPL remediation system being simulated, it is the parameters related to the ground-water environment and the parameters defining the free product of oil that are very important in determining the volume of the recovered LNAPL. With a good deal of data applied for the remediation process simulation one may expect model solutions of different levels of reliability.

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Rheological investigations and two-phase modeling on semi-solid metal suspensions

Koke J., Modigell M., Petera J.

Applied Mechanics and Engineering

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1999

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Vol. 4, no spec.

345-350

EN

Semi-solid metal alloys, as used in the modern forming process Thixoforming, consist of a special microstructure of spherical grains suspended in the liquid metal matrix. The complex rheological properties are strongly influenced by the local solid fraction, particle shape, particle size and state of agglomeration. The material under investigation is a tin-lead alloy (Sn-15%Pb), that is initially cooled down from the liquid state to the semi-solid range under constant shearing and then kept under isothermal conditions. Rheological experiments such as step-changes of shear rate and shear stress ramps were performed for different fractions of solid. The alloy exhibits a yield stress and highly thixotropic flow behavior. A model is presented which can predict the thixotropic behaviour in addition to the phase segregation owing to inclusion of the solid fraction with proper balance equations. The model equations are employed into FEM software and a characteristic flow case is simulated and validated by experiments