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OCR for page 193

B
Symbols
p
D
DH
Fr
g
go
G
J
k-£
L
n
Heat capacity, or specific heat, J/kg-K
Diffusion coefficient, m2/s
Hydraulic diameter, m
Froude number
Acceleration due to gravity (not necessarily Earth's), m/s2
Gravity level at Earth's surface, m/s2
Artificial gravity level produced by rotation, m/s2
Inlet velocity, m/s
Turbulent kinetic energy (k) and dissipation (£)
Characteristic length scale or distance between boundaries, m
Numerical exponent (greater than unity), dimensionless
NSUB Nondimensional inlet subcooling
p Pressure in fluid, N/m2
q max Critical heat flux, W/m2
Radial position, m
Radius of pipe, m
Saturation temperature, K
Wall temperature
R
T
sat
or
lw
U
W
W
X
y
Axial velocity fluctuation, m/s
Lateral velocity fluctuation, m/s
u'v' Reynolds stress (divided by density), m2/s2
Angular velocity of general rotation (e.g., of spacecraft about a distant axis), radians/s
Flow rate, kg/s
Axial dimension, m
Radial distance (e.g., of spacecraft) from axis of general rotation, or lateral position, m
Lateral dimension, m
193

OCR for page 193

194
ock
£
V
rl
r
p
C,
—£
CO
APPENDIX B
Volume fraction of phase k
An overall difference of a property (e.g., /\p), measured or given at a certain position
Amplitude of oscillation, m
Friction number, fLIDH
Kinematic viscosity of fluid, m2/s
Single-phase pressure-drop-to-inlet-velocity ratio, N-s/m4
Two-phase pressure-drop-to-inlet-velocity ratio, N-s/m4
Mass density of fluid medium, kg/m3
Surface tension, N/m
Reynolds stress (~) and turbulent dissipation (£)
Angular velocity, radians/s