Temat: Dumitrescu model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of viscosity on the shape of an air Taylor bubble in a stagnant liquid under turbulent condition in falling film
Autorzy:: Lertnuwat, B.
Powiązania:: https://bibliotekanauki.pl/articles/265385.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: lepkość
metoda Taylora
turbulencja
Dumitrescu model
viscosity
Taylor bubble
turbulence
Opis:: This work aims to find the influence of the liquid viscosity on the shape of an air Taylor bubble, rising up in a pipe column which contains the liquid under conditions that the liquid is stagnant and the Froude number is approximately equal to 0.35. Five liquid viscosities (from 0.001 to 0.01 Pa · s) were selected for being computationally investigated. An appropriate shape of a Taylor bubble, corresponding to each selected viscosity, was obtained by considering a pressure distribution of the air inside the bubble. Simulation results showed that the Taylor bubble shape would be thicker if the liquid viscosity was decreased. This could be explained by using the theory of the log-law velocity profile.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 67-77
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Shapes of an air Taylor bubble in stagnant liquids influenced by different surface tensions
Autorzy:: Lertnuwat, B.
Powiązania:: https://bibliotekanauki.pl/articles/265869.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: turbulencje
napięcie powierzchniowe
model Taylora
Dumitrescu-and-Taylor model
Froude number
surface tension
Taylor bubble
turbulence
Opis:: The aim of this work is to propose an empirical model for predicting shapes of a Taylor bubble, which is a part of slug flows, under different values of the surface tension in stagnant liquids by employing numerical simulations. The k - turbulence model was used in the framework of finite volume method for simulating flow fields in a unit of slug flow and also the pressure distribution on a Taylor bubble surface. Assuming that an air pressure distribution inside the Taylor bubble must be uniform, a grid search method was exploited to find an appropriate shape of a Taylor bubble for six values of surface tension. It was found that the shape of a Taylor bubble would be blunter if the surface tension was increased. This was because the surface tension affected the Froude number, controlling the flow around a Taylor bubble. The simulation results were also compared with the Taylor bubble shape, created by the Dumitrescu-and-Taylor model and former studies in order to ensure that they were consistent. Finally, the empirical model was presented from the simulation results.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 79-90
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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