Energy dissipation of the liquid in systems with a hydrophobic surface

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU140238" target="_blank" >RIV/00216305:26210/17:PU140238 - isvavai.cz</a>

Result on the web

<a href="https://www.epj-conferences.org/articles/epjconf/abs/2017/12/epjconf_efm2017_02022/epjconf_efm2017_02022.html" target="_blank" >https://www.epj-conferences.org/articles/epjconf/abs/2017/12/epjconf_efm2017_02022/epjconf_efm2017_02022.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/201714302022" target="_blank" >10.1051/epjconf/201714302022</a>

Result language

angličtina

Original language name

Energy dissipation of the liquid in systems with a hydrophobic surface

Original language description

The work is divided into theoretical and experimental parts. In the theoretical part the viscous forces performance for both laminar as well as turbulent flow of compressible fluids are defined. It is split into the viscous forces useful power and the power corresponding to mechanical losses. This part is expressed by the dissipation function. It is shown that the dissipation function considering hydrophobic surfaces cannot be determined from the pressure difference. It is necessary to take into account the slip of the liquid over the hydrophobic surface which depends on the value of surface energy. The values of surface energy for different types of hydrophobic surfaces, obtained by experiment, are shown within this work. The new definition of the dissipation function for hydrophobic surfaces is presented depending on the adhesion coefficient, also determined by an experiment. The theoretical part of the work is complemented by experiment. The experiment is aimed at the differential pressure measurement in a circular cross section pipe. The results are processed for both laminar and turbulent stationary flow in relation to the flow. Both hydrophilic and hydrophobic surfaces and their mutual correlation are taken into consideration. On the basis of the new mathematical model for hydrophobic surfaces the value of dissipation function is determined depending on the slip velocity of the liquid along the hydrophobic surface.

Czech name

—

Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20301 - Mechanical engineering

Project

<a href="/en/project/GA16-18316S" target="_blank" >GA16-18316S: Principles and mechanisms causing microorganism elimination by hydrodynamic cavitation</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

EFM16 – Experimental Fluid Mechanics 2016

ISBN

—

ISSN

2100-014X

e-ISSN

—

Number of pages

6

Pages from-to

1-6

Publisher name

Neuveden

Place of publication

Neuveden

Event location

Mariánské lázně

Event date

Nov 15, 2016

Type of event by nationality

CST - Celostátní akce

UT code for WoS article

000407743800024