Measurement of pressure distribution in the Plateau borders of fresh and aged foams

Autor:	K. Koczo, E. Erdös, Gy. Rácz
Rok vydání:	1982
Předmět:	Materials science Polymers and Plastics Hydrostatic pressure Mechanics Plateau (mathematics) Surface pressure law.invention Surface tension Pressure head Colloid and Surface Chemistry Pressure measurement law Materials Chemistry Laplace pressure Physical and Theoretical Chemistry Porosity
Zdroj:	Colloid & Polymer Science. 260:720-725
ISSN:	1435-1536 0303-402X
DOI:	10.1007/bf01414659
Popis:	In the interpretation of foam ageing processes it is important to know the laws of fluid motion in the Plateau borders. In foams, the rate of fluid motion is determined, in principle, by the fluid viscosity, the static and dynamic surface tension, the shape of the capillaries and the pressure distribution. An attempt is made to investigate the role of these parameters experimentally. As a first step, the pressure and the pressure distribution were measured in the Plateau borders by liquid-filled manometers kept in contact with the Plateau borders through a porous plate. The pressure is always negative, and the pressure vs. time curves show maxima at the point of the start of draining. Draining starts when pressure difference drops to zero at the bottom of the foam container. After a sufficiently long time the pressure becomes equal to the hydrostatic pressure at the given level, i. e.Δp=−ϱgh, whereϱ is the density of the liquid andh is the height of the foam column measured from the bottom of the container.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::41d6e48c899eae6f86dad16e07b3c777 https://doi.org/10.1007/bf01414659 Zobrazit plný text záznamu Full text from SpringerLink