Naslov
REYNOLDS NUMBER EFFECTS IN THE NEAR – WALL REGION OF TURBULENT FILM FLOWS

Autori
Mijović, Budimir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
3rd International Congress of Croatian Society of Mechanics Cavtat / Pavao Marović - Cavtat : Croatian Society Of Mechanics, 2000, 475 - 482

Skup
3rd International Congress of Croatian Society of Mechanics Cavtat

Mjesto i datum
Dubrovnik, Hrvatska; Cavtat, Hrvatska, 28.09.2000. - 30.09.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Turbulent wall flows; film thickness; laser – Doppler anemometer

Sažetak
The aim of the work is analysis of performance of Reynolds numbers change on turbulence of liquid film flow near the wall of open channel. Experimental data on turbulent behaviour in the area close to the wall have been presented by use of high resonance LDA techniques, which allowed the determination of the Reynolds number range above which turbulence quantities scale on the inner variables. We started firsly with open channel where, by changing flow regimen we got certain values of RE number in range from 3000 up to 5000 which characterizes turbulent circulation. Velocities in the channel were measured from 0.04 mm up to film thickness of 5 mm and more. Using values of average and local velocities shear stress was calculated on the surface of wall tw as well as shear velocity ut . These experiments show that the velocity of flow has an important role in shaping of film layer on the surface.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija

POVEZANOST RADA