TY - JOUR
T1 - PIV measurements of turbulent flows in a 61-pin wire-wrapped hexagonal fuel bundle
AU - Nguyen, Thien
AU - Goth, Nolan
AU - Jones, Philip
AU - Lee, Saya
AU - Vaghetto, Rodolfo
AU - Hassan, Yassin
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - The current work experimentally investigates the flow characteristics in the near-wall region of the 61-pin wire-wrapped hexagon fuel bundle via the matched-index-of-refraction technique. Particle image velocimetry (PIV) measurements were taken in the region near the surfaces of the pins, wires and enclosure wall at the Reynolds number of 19,000. From the obtained PIV velocity vector fields, flow statistics such as mean velocity and root-mean-square fluctuating velocity profiles were computed. In addition, spatial-temporal cross-correlations of velocity-velocity and pressure-velocity were analyzed. A strong correlation between the wall fluctuating pressure signal and flow structures was observed. Finally, we applied the POD analysis to the vorticity snapshots obtained in the near-wall region to reveal the dominant flow structures. It was found that the large-scale structures were elongated and aligned with the mean flow direction.
AB - The current work experimentally investigates the flow characteristics in the near-wall region of the 61-pin wire-wrapped hexagon fuel bundle via the matched-index-of-refraction technique. Particle image velocimetry (PIV) measurements were taken in the region near the surfaces of the pins, wires and enclosure wall at the Reynolds number of 19,000. From the obtained PIV velocity vector fields, flow statistics such as mean velocity and root-mean-square fluctuating velocity profiles were computed. In addition, spatial-temporal cross-correlations of velocity-velocity and pressure-velocity were analyzed. A strong correlation between the wall fluctuating pressure signal and flow structures was observed. Finally, we applied the POD analysis to the vorticity snapshots obtained in the near-wall region to reveal the dominant flow structures. It was found that the large-scale structures were elongated and aligned with the mean flow direction.
UR - http://www.scopus.com/inward/record.url?scp=85016334083&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatfluidflow.2017.03.007
DO - 10.1016/j.ijheatfluidflow.2017.03.007
M3 - Article
AN - SCOPUS:85016334083
SN - 0142-727X
VL - 65
SP - 47
EP - 59
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
ER -