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Dynamics of Taylor bubble interface in vertical turbulent counter-current flow
ID
Kren, Jan
(
Avtor
),
ID
Zajec, Boštjan
(
Avtor
),
ID
Tiselj, Iztok
(
Avtor
),
ID
El Shawish, Samir
(
Avtor
),
ID
Perne, Žiga
(
Avtor
),
ID
Tekavčič, Matej
(
Avtor
),
ID
Mikuž, Blaž
(
Avtor
)
PDF - Predstavitvena datoteka,
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(11,28 MB)
MD5: 5038D69787A12EBEBBFDE064D79B6367
URL - Izvorni URL, za dostop obiščite
https://www.sciencedirect.com/science/article/pii/S0301932223001039
Galerija slik
Izvleček
Dynamics of the Taylor bubble interface in the vertical counter-current flow was analyzed with video recordings at 100 – 800 frames per second. Taylor bubbles in air-water mixture were studied on time intervals of up to several minutes in stagnant conditions, where buoyancy is dynamically balanced by the inertial bubble drag in the downward turbulent flow. Taylor bubbles of length from 4 to 10 cm were observed in a pipe of 26 mm diameter at Reynolds numbers based on liquid superficial velocity around 6000. Algorithms, developed for analysis of the interface from the video frames were dedicated to the analysis of the cap and the body of the Taylor bubble. The long time averaging of up to 10 min samples do not end up with axisymmetric time-averaged shape of the bubble, but with an asymmetric bullet-train shape, with the thinnest liquid film observed on the belly of the bullet-train shape bubble. The main result of this study is based on high relative sensitivity of our measurements, which was sufficient to track the dynamics of the tiny disturbance waves with a tenth of mm amplitudes traveling along the interface of the Taylor bubble. Cross-correlations of time-dependent interface fluctuations measured at different spatial positions allowed us to measure propagation speeds of the interface waves. When averaged over sufficiently long time intervals of around a minute, the time averaged propagation velocities are shown to be equal to the convective velocity of the interface. Moreover, waves propagating on both sides of the two-dimensional photographs show clear correlation; crest of the wave on one side of the bubble photograph corresponds to the trough of the wave on the other side.
Jezik:
Angleški jezik
Ključne besede:
slug flow
,
Taylor bubble
,
interfacial waves
Vrsta gradiva:
Članek v reviji
Tipologija:
1.01 - Izvirni znanstveni članek
Organizacija:
FMF - Fakulteta za matematiko in fiziko
Status publikacije:
Objavljeno
Različica publikacije:
Objavljena publikacija
Leto izida:
2023
Št. strani:
20 str.
Številčenje:
Vol. 165, art. 104482
PID:
20.500.12556/RUL-148316-3f57de71-04f6-f6a1-26df-5fb3d0c11804
UDK:
621.39
ISSN pri članku:
0301-9322
DOI:
10.1016/j.ijmultiphaseflow.2023.104482
COBISS.SI-ID:
150153219
Datum objave v RUL:
11.08.2023
Število ogledov:
522
Število prenosov:
69
Metapodatki:
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Objavi na:
Gradivo je del revije
Naslov:
International journal of multiphase flow
Skrajšan naslov:
Int. j. multiph. flow
Založnik:
Elsevier
ISSN:
0301-9322
COBISS.SI-ID:
25649408
Licence
Licenca:
CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:
http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:
Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Projekti
Financer:
ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:
P2-0026
Naslov:
Reaktorska tehnika
Financer:
ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:
NC-0026
Naslov:
Eksperimentalne in numerične raziskave vertikalnih čepastih tokov
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