TY - JOUR
T1 - Influence of secondary flow generated in a 90-deg bend on the thermal-hydraulic characteristics in a mixing tee
AU - Yuki, Kazuhisa
AU - Sugawara, Yoshimasa
AU - Hosseini, Seyed Mohammad
AU - Hashizume, Hidetoshi
AU - Toda, Saburo
AU - Tanaka, Masa Aki
AU - Muramatsu, Toshiharu
PY - 2008/2
Y1 - 2008/2
N2 - Th is study aims at clarifying a relationship between nonisothermal fluid mixing in a T-junction area with a 90-deg bend upstream and temperature fluctuations induced by the unstable mixing, by visualizing the flow fields with particle image velocimetry and measuring fluid-temperature fluctuation in the vicinity of a wall. From the visualization, it is clarified that a high-temperature jet flowing out from a branch pipe swings and sways near the wall, though the mixing patterns are basically classified into the same ones without the 90-deg bend upstream. Furthermore, there are cautionary conditions in which the temperature fluctuation is maximized in a transition regime between a stratified flow and a turn-jet flow. It seems that the principal cause is repetitional generation and disappearance of a circulating flow formed behind the jet due to an interaction between unsteady behavior of a secondary flow in a decay process after the bend and the wakes formed behind the jet, which leads to the vigorous oscillation of the jet near the wall.
AB - Th is study aims at clarifying a relationship between nonisothermal fluid mixing in a T-junction area with a 90-deg bend upstream and temperature fluctuations induced by the unstable mixing, by visualizing the flow fields with particle image velocimetry and measuring fluid-temperature fluctuation in the vicinity of a wall. From the visualization, it is clarified that a high-temperature jet flowing out from a branch pipe swings and sways near the wall, though the mixing patterns are basically classified into the same ones without the 90-deg bend upstream. Furthermore, there are cautionary conditions in which the temperature fluctuation is maximized in a transition regime between a stratified flow and a turn-jet flow. It seems that the principal cause is repetitional generation and disappearance of a circulating flow formed behind the jet due to an interaction between unsteady behavior of a secondary flow in a decay process after the bend and the wakes formed behind the jet, which leads to the vigorous oscillation of the jet near the wall.
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U2 - 10.13182/NSE08-A2746
DO - 10.13182/NSE08-A2746
M3 - Article
AN - SCOPUS:39049150010
VL - 158
SP - 194
EP - 202
JO - Nuclear Science and Engineering
JF - Nuclear Science and Engineering
SN - 0029-5639
IS - 2
ER -