TY - JOUR
T1 - Visualization method for cross-sectional two-phase flow structure during the condensation of steam in a tube
AU - Pusey, Andree
AU - Kim, Dongeok
AU - Park, Hyun Sik
AU - Kwon, Tae Soon
AU - Kim, Hyungdae
N1 - Funding Information:
This research was supported by the nuclear R&D program supported by the Ministry of Trade, Industry and Energy of the Korean government (No. 20141510400060). Also, it was supported by ?Human Resources Program in Energy Technology? of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20164030200990).
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Abstract: This paper describes an experimental investigation in which the cross-sectional two-phase flow structure during condensation of steam inside various inclined tubes was visualized using an axial-viewing technique and a high-speed camera. The two-phase flow structure was visualized along the axis of the condensation tube by locating the camera in front of the viewer that was fitted at the outlet of the tube where a short section of it was illuminated. This innovative technique permitted direct viewing into the flow and imaging of the cross-sectional area in a pipe of 16.55 mm inner diameter at atmospheric pressure and a saturation temperature of 100 °C. The downward inclination angle of the condensation tube in this study was varied from 3° to 75°, and three steam qualities, with values of 0.17, 0.34, and 0.78, were examined at the outlet of the pipe. A visualization test was conducted at a low steam mass flux of 3.43 kg/m2 s. Cross-sectional two-phase flow was clearly visible and identified easily over the range of inclination angles used; stratified-wavy flow was the most commonly observed flow pattern. Also, downward inclination had a significant effect on condensation parameters, such as void fraction, wetted angle, and bottom film thickness, which, in turn, showed that gravitational effects may improve condensation phenomena. Graphical abstract: [Figure not available: see fulltext.].
AB - Abstract: This paper describes an experimental investigation in which the cross-sectional two-phase flow structure during condensation of steam inside various inclined tubes was visualized using an axial-viewing technique and a high-speed camera. The two-phase flow structure was visualized along the axis of the condensation tube by locating the camera in front of the viewer that was fitted at the outlet of the tube where a short section of it was illuminated. This innovative technique permitted direct viewing into the flow and imaging of the cross-sectional area in a pipe of 16.55 mm inner diameter at atmospheric pressure and a saturation temperature of 100 °C. The downward inclination angle of the condensation tube in this study was varied from 3° to 75°, and three steam qualities, with values of 0.17, 0.34, and 0.78, were examined at the outlet of the pipe. A visualization test was conducted at a low steam mass flux of 3.43 kg/m2 s. Cross-sectional two-phase flow was clearly visible and identified easily over the range of inclination angles used; stratified-wavy flow was the most commonly observed flow pattern. Also, downward inclination had a significant effect on condensation parameters, such as void fraction, wetted angle, and bottom film thickness, which, in turn, showed that gravitational effects may improve condensation phenomena. Graphical abstract: [Figure not available: see fulltext.].
KW - Axial-viewing technique
KW - Condensation
KW - Inclination angle
KW - Two-phase flow
KW - Void fraction
UR - http://www.scopus.com/inward/record.url?scp=84996917592&partnerID=8YFLogxK
U2 - 10.1007/s12650-016-0408-0
DO - 10.1007/s12650-016-0408-0
M3 - Article
AN - SCOPUS:84996917592
VL - 20
SP - 591
EP - 605
JO - Journal of Visualization
JF - Journal of Visualization
SN - 1343-8875
IS - 3
ER -