Abstract
The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 |
| State | Published - Dec 1 2007 |
| Event | 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 - Pittsburgh, PA, United States Duration: Sep 30 2007 → Oct 4 2007 |
Publication series
| Name | Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 |
|---|
Other
| Other | 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 |
|---|---|
| Country | United States |
| City | Pittsburgh, PA |
| Period | 9/30/07 → 10/4/07 |
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All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering
- Nuclear and High Energy Physics
Cite this
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Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. / Kim, Seungjin; Kojasoy, Gunol; Guo, Tangwen.
Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow
AU - Kim, Seungjin
AU - Kojasoy, Gunol
AU - Guo, Tangwen
PY - 2007/12/1
Y1 - 2007/12/1
N2 - The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.
AB - The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.
UR - http://www.scopus.com/inward/record.url?scp=80053170918&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80053170918&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:80053170918
SN - 0894480588
SN - 9780894480584
T3 - Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
BT - Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
ER -