Abstract
The process of two-phase natural convection in an annular channel formed between a heated hemispherical vessel and a surrounding thermal insulation structure is studied theoretically and experimentally. The flow, being driven by buoyancy, is induced entirely by the boiling process taking place on the downward-facing side of the channel, i.e., on the outer surface of the heated vessel. Results of the flow analysis and the experimental observations indicate that there is a strong interaction between the induced two-phase motion and the boiling process. While the mass flow rate of the induced flow is a strong function of the wall heat flux, the rate of boiling is significant affected by the resulting flow. Relative to the case without thermal insulation, a higher boiling heat transfer is obtained in the present case, evidently due to an enhanced mass flow rate induced by the boiling process with the presence of a thermal insulation structure.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 29-36 |
| Number of pages | 8 |
| Journal | American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD |
| Volume | 361-1 |
| State | Published - Dec 1 1998 |
| Event | Proceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition - Anaheim, CA, USA Duration: Nov 15 1998 → Nov 20 1998 |
All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Fluid Flow and Transfer Processes