Abstract
In relation to the development of the interfacial-area transport equation, this study collected data sets on the axial development of area-averaged (one-dimensional) void fraction and interfacial-area concentration in vertical upward-developing bubbly flows using three mini pipes. The test pipe inner diameters were 0.55, 0.79 and 1.02 mm, and the lengths were 500 mm. Image processing was used to characterize the flow at five axial locations, z/D = 15.0, 75.0, 150, 250 and 450, where z and D are the axial distance from the inlet and inner pipe diameter, respectively. In the experiment, the superficial liquid velocity and the void fraction ranged from 0.395 m s-1 to 4.89 m s-1 and from 0.958 % to 28.6 %, respectively. The one-dimensional interfacial-area transport equation with a sink term due to wake entrainment was evaluated by using the newly obtained datasets. It was confirmed that the interfacial-area transport equation could reproduce the proper trend of the axial interfacial-area transport and predict the measured interfacialarea concentrations well. It was found that the present model shows promise for predicting the interfacial-area transport of mini-pipe bubbly flows in the test conditions of this study.
| Original language | English |
|---|---|
| Title of host publication | Frontier Research in Microscale and Nanoscale Thermal and Fluid Sciences |
| Publisher | Nova Science Publishers |
| Pages | 57-82 |
| ISBN (Print) | 9781536117783, 9781613246658 |
| Publication status | Published - 1 Jan 2012 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Gas-liquid bubbly flow
- Interfacial-area transport
- Microchannel
- Minichannel
- Multiphase flow
- Two-fluid model
- Wake-entrainment