Abstract
To evaluate the effect of pipe wall surface wettability on flow characteristics in a vertical upward gas-liqid two-phase flow, a visualization study was performed using three test pipes : an acrylic pipe, a hydrophilic pipe and a hydrophobic pipe. Such basic flow characteristics as flow patterns, pressure drop and void fraction were investigated in these three pipes. In the hydrophilic pipe, the slug flow to churn flow transition boundary was shifted to a higher gas velocity at a given liquid velocity, whereas the churn flow to annular flow transition boundary was shifted to a lower gas velocity at a given liquid velocity. In the hydrophobic pipe, an inverted churn flow regime was observed in the region where the churn flow regime was observed in the acrylic pipe, while a droplet flow regime was observed in the region where an annular flow regime was observed in the acrylic pipe. At a high gas flow rate, the mean void fraction in the hydrophobic pipe was higher than in the acrylic pipe. The effect of surface wettability on frictional pressure loss was confirmed to be insignificant under the present experimental conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 1502-1509 |
| Journal | Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 73 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 2007 |
| 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
- Contact angle
- Flow patterns
- Flow visualization
- Gas-liquid two-phase flow
- Pressure drop
- Void fraction
- Wettability