Loading…
Flow visualization of natural convection in a tall, air-filled vertical cavity
Natural convection of air in a tall vertical cavity was studied using a smoke patterns and interferometry. Experiments covered Rayleigh numbers of 4850 < Ra < 54,800 and aspect ratio A ≈ 40. Secondary cells were noted at Ra as low as 6228. The flow was stable at Ra < 10 4. As Ra exceeded 10...
Saved in:
Published in: | International journal of heat and mass transfer 2006-03, Vol.49 (5), p.889-904 |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | Natural convection of air in a tall vertical cavity was studied using a smoke patterns and interferometry. Experiments covered Rayleigh numbers of 4850
<
Ra
<
54,800 and aspect ratio
A
≈
40. Secondary cells were noted at
Ra as low as 6228. The flow was stable at
Ra
<
10
4. As
Ra exceeded 10
4 the flow became irregular, the core flow became increasingly unsteady and 3-D motion became evident. Interferometry showed that most of the temperature drop exists in boundary layers near the walls. The core is well mixed and of relatively uniform temperature with little or no vertical stratification. |
---|---|
ISSN: | 0017-9310 1879-2189 |
DOI: | 10.1016/j.ijheatmasstransfer.2005.06.045 |