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Experimental study of turbulent supercritical open channel water flow as applied to the CLiFF concept

Summary: Experimental study of turbulent supercritical open channel
water flow as applied to the CLiFF concept
S. Smolentsev 1, B. Freeze, N. Morley, M. Abdou
Fusion Science and Technology Group, Department of Mechanical and Aerospace Engineering, UCLA, 420 Westwood Plaza, 44-114
Engineering IV, Box 951597, Los Angeles, CA 90095-1597, USA
An experimental study of turbulent open channel water flows was conducted that simulated basic features of the flow
of molten salt in the convective liquid flow first-wall (CLiFF) concept, which is a part of the Advanced Power
Extraction (APEX) study. Unlike many other studies of open channel flows, the present one concentrates on a
supercritical flow regime, in which surface waviness and wave┴/turbulence interaction are the most important processes
that determine the heat transfer rate in CLiFF flows. The current study covers the Reynolds number and Froude
number range of 1)/104
and 150┴/250, respectively, with a fixed chute inclination angle of 308. The statistical
characteristics of the wavy interface were obtained with an ultrasound transducer. A spectral analysis of the oscillating
flow thickness shows that a major part of the spectrum is presented by long finite-amplitude waves (f0/10┴/50 Hz),
which carry a significant part of the volumetric flux. Based on dye technique observations, short waves are mostly
responsible for mixing the liquid at the surface. The surface waviness can be characterized by a parameter built through
the mean flow thickness, h, and its standard deviation (S.D.), s, as 0.5s/h, which is almost constant, 0.1, in all
experiments. The mean flow thickness variations are predicted well with the `K┴/o' model of turbulence [Int. J. Eng. Sci.


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion