Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: adsorption layer

Sortuj według:

Ogranicz wyniki do:

Monitoring of contamination of coal processing plants and environmental waters using bubble velocity measurements – advantages and limitations

Zawala J., Malysa E., Krzan M., Malysa K.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 1

143--157

The paper presents fundamentals of a simple physicochemical method (SPMD) and analysis of results obtained when the method was applied for detection of organic contaminations (surface-active substances SAS) in samples of environmental and industrial waters. The method is based on measurements of variations of air bubble local velocities, which can be significantly changed in presence of surface-active contaminants. Lowering of the bubble velocity is a consequence of a motion induced dynamic adsorption layer (DAL) formed over surface of the rising bubble. The DAL formation retards the surface fluidity and the bubble rising velocity can be lowered by over 50% when the bubble surface is completely immobilized. We showed that the SPMD is a very sensitive tool (detection limit even below 1 ppm) for detection of various kinds of surface-active substances (ionic, non-ionic) in water samples. On the basis of results obtained using precise laboratory set-up, an accuracy of the SPMD is discussed. Moreover, effect of inert electrolyte addition on the bubble velocity lowering and value of detection limit of the SPMD is discussed. Simple approach, enabling quantitative analysis of the surface-active contaminants in samples collected, based on “equivalent concentrations” determination, is proposed. Results obtained for industrial (Jankowice and Knurow coal processing plants, Jaslo Refinery channel) and environmental waters (Wisloka and Ropa river) are used for detailed analysis and critical discussion of advantages and limitations of the SPMD.

Lubricity of organic deposits on friction surface at elevated temperature

Konchits V.V., Korotkevich S.V., Kirpichenko Yu.E., Myshkin N.K.

Tribologia

2003

nr 1

53--62

The lubricity of organic deposits (D-layer) formed when the lubricant contacts the hot metallic surface has been studied. The load carrying capacity and frictional properties of the D-layers produced by the oil with an additive of the ZnDTP type on platinum have been investigated by electrophysical probing. The emphasis was placed on the effect of temperature in the contact zone on behavior of the D-layers; their possible role in the mechanism of boundary lubrication is discussed.

Autorzy badali smarność warstewek utworzonych ze związków organicznych (tzw. warstewki D) na skutek kontaktu środka smarowego z gorącą powierzchnią tarcia. Wyznaczono przeciwzatarciowe i przeciwcierne właściwości takich warstewek dla powierzchni platyny smarowanej olejem z dodatkiem ZDDP. Szczególną uwagę poświęcono wpływowi temperatury w strefie styku na właściwości warstewek D oraz ich rolę w smarowaniu granicznym.