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Vortex Flow Study on Non-Newtonian Fluids in Concentric Annulus with Inner Cylinder Rotating
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yoon, Chi-Ho Park, Yong-Chan Lee, Dong-Kil Kwon, Seok-Ki |
| Copyright Year | 2006 |
| Abstract | The present paper concerns the characteristics of transitional flow of non-Newtonian fluids in a concentric annulus with a diameter ratio of 0.52, whose outer cylinder is stationary and inner one rotating. The pressure drop and skin friction coefficients have been measured for the fully developed flows of 0.2% aqueous solution of sodium carbomethyl cellulose (CMC) at inner cylinder rotational speeds of 0∼600 rpm. The pressure drop is increased in the laminar region as the rotational speed increases. The transitional flow has been examined by the measurement of pressure drops and visualization of flow fields, to reveal the relation between the Reynolds and Rossby numbers with the skin friction coefficients and to understand the flow instability mechanism. The effect of Reynolds number and rotation of the inner cylinder on the skin friction coefficient is significantly dependent on the flow regime. Consequently, the critical bulk flow Reynolds number Rec decreases as the rotational speed increases. Thus, the rotation increase of the inner cylinder promotes the onset of transition due to the excitation of Taylor vortices. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.isope.org/publications/proceedings/ISOPE/ISOPE%202006/papers/2006_JSC_206.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
