Wyniki wyszukiwania - BazTech

1

Effects of Hindrance Factors on a Squeeze Film of a Porous Bearing Lubricated With a Dehaven Fluid

Walicka A., Walicki E., Jurczak P., Falicki J.

Machine Dynamics Research

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2018

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Vol. 42, No. 1

15--33

EN

In the paper the influence of the hindrance factors on the pressure distribution and loadcarrying capacity of a curvilinear thrust porous bearing is discussed. The equations of motion of a pseudo-plastic fluid of DeHaven are used to derive the Reynolds equation. The general considerations on the flow in a bearing clearance were presented. The analytical considerations on the flow in a thin porous layer composed of capillaries were also presented. Two models of the porous region were used, e.g.: capillary tube with constant cross-section and capillary tube with variable cross-section with rectilinear generatrices. Next, using the Morgan-Cameron approximation the modified Reynolds equation was obtained. As a result the formulae expressing pressure distribution and load-carrying capacity were obtained. Thrust radial bearing with a squeeze film of DeHaven fluid was considered as an example.

2

Modelowanie ruchu cieczy w kapilarze po oderwaniu się pęcherza gazowego

Mosdorf R., Wyszkowski T.

Modelowanie Inżynierskie

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2011

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T. 11, nr 42

275-282

PL

W pracy przedstawiono wyniki symulacji ruchu cieczy w kapilarze, z której wydostają się pęcherze powietrza. Ruch cieczy opisano nieliniowymi równaniami ruchu, opartymi na drugiej zasadzie dynamiki Newtona z uwzględnieniem równania gazu rzeczywistego, siły napięcia powierzchniowego oraz sił lepkości. Wyniki symulacji porównano z wynikami badań eksperymentalnych, w których pęcherze powietrza generowane były ze szklanych dysz umieszczonych na dnie zbiornika wypełnionego wodą. Uzyskano dobrą ilościową zgodność wyników symulacji z wynikami eksperymentalnymi.

EN

In the paper the liquid movement inside the capillary tube used for bubble generation has been numerically simulated. The liquid movement has been described by non-linear equation based on Newton role with consideration of gas equation, surface tension and viscosity force. Results of simulation has been compared with experimental results. In the experiment the liquid movement has been recorded using the high speed camera in glass capillary tube. Good agreement with experimental data has been obtained.

3

Study of capillary tube applications in a transcritical heat pump system

Królicki Z., Białko B.

Archives of Thermodynamics

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2006

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Vol. 27, no. 4

123-146

EN

Capillary tubes have been used in refrigeration systems for many years, but not with a transcritical CO[2] system. The effects of capillary tubes in a transcritical CO[2] refrigerating system have been investigated theoretically. This paper presents a non-adiabatic homogeneous model of carbon dioxide flow through a capillary tube, where the carbon dioxide undergoes a phase change from supercritical fluid flow to subcritical two-phase flow. The model is based on fundamental conservation equations of mass, momentum and energy. These equations are solved simultaneously through iterations. The in-tube flow can be divided into a single-phase region and a two-phase region. The extreme choked situation at the outlet is evaluated by local sonic velocity judgment. Relationships between gas cooler pressure, evaporating temperature, ambient heat transfer coefficient and other parameters are presented and analyzed in detail.

4

Proces dławienia dwufazowych czynników chłodniczych a zjawisko przepływu metastabilnego

Florek R., Królicki Z.

Chłodnictwo : organ Naczelnej Organizacji Technicznej

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2001

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R. 36, nr 12

10-16

PL

W artykule przedstawiono problem zjawiska metastabilności przepływu w procesie dławienia dwufazowego czynnika chłodniczego w kapilarnym elemencie dławiącym ziębiarki sprężarkowej. Zwrócono uwagę na wpływ strefy przepływu metastabilnego na parametry wylotowe ziębnika oraz na pracę i wydajność rurki kapilarnej. Przeanalizowano znaczenie zjawiska metastabilności w procesie dławienia mieszanin zeotropowych ziębni-ków niedestrukcyjnych dla warstwy ozonowej.

EN

The paper shows results of theoretical analysis of the metastable flow phenomenon during the two-phase refrigerants throttling process inside the capillary tube. The effect of the metastable flow region on outlet refrigerant parameters and real working parameters of the throttling capillary tube is noticed. The meaning of the metastable flow phenomenon during the natural zeotropic mixtures throttling process is presented.