Loading...
Please wait, while we are loading the content...
Similar Documents
Bubble Formation and Detachment in Liquid Flow Under Normal and Reduced Gravity
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nahra, Henry K. Kamotani, Yasuhiro |
| Copyright Year | 1998 |
| Abstract | 1. Abstract Two-phase flows are present in a wide variety of applications for spacecraft thermal control systems design. Bubble formation and detachment is an integral part of the two-phase flow science. The authors objective is to experimentally investigate the effects of liquid cross velocity, gas velocity, and nozzle diameter on the bubble diameter at detachment under reduced and normal gravity and under relatively low gas flow rates. Results from ground (1 g) and reduced gravity experiments will be presented in this paper. For the 1g experiment, a flow loop was designed and built to accommodate a range of liquid and gas flow rates. The reduced gravity experiment was conducted on the NASA DC-9 reduced gravity platform using the two-phase flow loop qualified for operation on the low-gravity platform. Flow visualization is accomplished using a high speed 500 frames/s camera. The results suggest that the existence of buoyancy force contributes to the faster detachment of bubbles. Buoyancy helps the detachment process which results in smaller bubbles being formed. In reduced gravity, although drag force is present, the virtual non-existence of buoyant force results in larger bubbles and longer times for detachment. Theoretical predictions are also presented in this paper and seem to agree with the experimental results. |
| File Format | PDF HTM / HTML |
| DOI | 10.2514/6.1998-732 |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19980017195.pdf |
| Alternate Webpage(s) | https://doi.org/10.2514/6.1998-732 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
