TY - JOUR
T1 - The Characteristics of Turbulence in a Cylindrical Vessel with Large Scale Recirculating Regions
T2 - (Measurements of Flow Fields with Temperature Distribution)
AU - Ichikawa, Akihiko
AU - Hishida, Kohichi
AU - Maeda, Masanobu
AU - Yokobori, Seiichi
PY - 1986
Y1 - 1986
N2 - The characteristics of turbulence in the fields of velocity and temperature of the upper plenum of LMFBR have been investigated to estimate the behavior of thermal diffusion near the upper core structure (UCS). An inlet nozzle of a 1/20 scale experimental vessel provided a co-axial water jet with temperature distribution. The two component velocity measurements were carried out by 3 beam laser Doppler velocimetry, where the temperature was simultaneously measured to obtain correlations among fluctuations of velocity and temperature. The results indicated that the higher temperature jet flow did not mix with colder surroundings up to the bottom of the UCS. Remarkable thermal striping could be observed at the edge of UCS bottom. Sufficient turbulent mixing of momentum and heat was realized after the separation at the edge of UCS bottom, since the higher temperature jet flowed slantingly to the lower temperature surrounding jet.
AB - The characteristics of turbulence in the fields of velocity and temperature of the upper plenum of LMFBR have been investigated to estimate the behavior of thermal diffusion near the upper core structure (UCS). An inlet nozzle of a 1/20 scale experimental vessel provided a co-axial water jet with temperature distribution. The two component velocity measurements were carried out by 3 beam laser Doppler velocimetry, where the temperature was simultaneously measured to obtain correlations among fluctuations of velocity and temperature. The results indicated that the higher temperature jet flow did not mix with colder surroundings up to the bottom of the UCS. Remarkable thermal striping could be observed at the edge of UCS bottom. Sufficient turbulent mixing of momentum and heat was realized after the separation at the edge of UCS bottom, since the higher temperature jet flowed slantingly to the lower temperature surrounding jet.
KW - FBR (Fast Breeder Reactor)
KW - Forced Convection Turbulent Heat Flux
KW - Laser Doppler Velocimetry
KW - Recirculating Flow
KW - Temperature and Velocity Measurement
KW - Turbulence
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U2 - 10.1299/kikaib.52.898
DO - 10.1299/kikaib.52.898
M3 - Article
AN - SCOPUS:0022667646
SN - 0387-5016
VL - 52
SP - 898
EP - 903
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 474
ER -