Studium chování kapaliny umístěné na vlákenném systému
Title Alternative:Liqiud film behaviour on the fibre surface
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Date
2010
Authors
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Journal ISSN
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Publisher
Technická Univerzita v Liberci
Abstract
Táto diplomová práca sa zaoberá štúdiom rozpadu kvapalinového filmu na vláknach. Vzniknuté kvapalinové útvary sú výsledkom prejavu jednej z najdôležitejšej vlastnosti kvapalín, ktorou je schopnosť kvapaliny zmáčať nielen povrch vlákna, ale aj samovoľné vnikanie kapaliny do jadra vlákna cez póry. Práve táto vlastnosť je podstatná pre oblasti ako je zušľachťovanie textílií, farmaceutický priemysel a kozmetika. Praktická časť práce je rozdelená do dvoch častí. Prvá časť sa zaoberá dynamikou rastu Rayleighových nestabilít. Zameraná je na priblíženie všetkých faktorov, ktoré ovplyvňujú správanie sa kvapaliny v čase, vzhľadom na okolité podmienky. Hlavnými premennými v tejto fáze samotného vývoja nestabilít nazvanej dynamická časť sú vlastnosti použitej kapaliny, ako je povrchové napätie, viskozita, vlastnosti simulovaného vlákna, ktorým je PAD vlasec a jeho priemer. Druhá časť sa zaoberá pozorovaním už vzniknutých kvapiek, v tzv. kľudovom stave ich rovnovážnej polohy ako: dokonalosť tvaru nestabilít (ich obsahy priemetu plôch) a samotné vzdialenosti medzi jednotlivými kvapalinovými útvarmi.
Graduation theses dealt about study of behaviour the liqiud film stability on the fibre surface. The Rayleight instabilities can be described as final product of infulence of liquid film characteristic such are wetting of fibers and viscosity of liquid film are. That behaviour is very important for pharmacy and textile finish sector also for another charcteristic as water penetration into the center core of the fibers is. The experimental part dealing with dynamic part - beading of liquid film and evaluation the infulence of the liquid film characteristics and PAD fiber as diameters. The another one part dealing with final static situation of alredy spontaneously braked liquid film into small beads. Instability development of PVA will be observed and the initial film thickness as well as wavelenght between neighbouring droplets will be measured. Furthermore, characterising the parameters of droplets profile, namely droplet height and areas in square will be measure. The Rayleight wavelenght and initial diameter of liquid film will be also calculate using corespondet equations.
Graduation theses dealt about study of behaviour the liqiud film stability on the fibre surface. The Rayleight instabilities can be described as final product of infulence of liquid film characteristic such are wetting of fibers and viscosity of liquid film are. That behaviour is very important for pharmacy and textile finish sector also for another charcteristic as water penetration into the center core of the fibers is. The experimental part dealing with dynamic part - beading of liquid film and evaluation the infulence of the liquid film characteristics and PAD fiber as diameters. The another one part dealing with final static situation of alredy spontaneously braked liquid film into small beads. Instability development of PVA will be observed and the initial film thickness as well as wavelenght between neighbouring droplets will be measured. Furthermore, characterising the parameters of droplets profile, namely droplet height and areas in square will be measure. The Rayleight wavelenght and initial diameter of liquid film will be also calculate using corespondet equations.
Description
katedra: KNT; přílohy: 1 CD; rozsah: 78
Subject(s)
rozpad kvapalinového filmu, zmáčavosť kvapaliny, rayleighova nestabilita, povrchové napätie, viskozita, vlnová dĺžka nestabilít, beading of liqiud film, wetting of fibres by liquid, rayleigh instability, the surface forces- surface tensions, absolute viskosity, disturbance of droplets periodicity {$\lambda$}