502     Fundamentals of Fluid Mechanics and Transport Phenomena 
3 components (star), 429 
n components, 414 
Thermodynamic 
fluxes, 57 
forces, 57, 58 
potentials, 23, 25 
Thrust of a rocket, 114 
Time-frequency representation, 374 
Time-invariant system, 408 
linear, 408, 410, 420 
Time-scale transform, 373 
Trajectory, 121 
Transitional regimes, 421 
Tricomi equation, 238 
Turbulence 
analysis of signals, 402 
Turbulent and acoustic pressure 
fluctuations, 403 
Two wall thermal system, 439 
V 
Variables 
Eulerian, 14, 119, 412 
extensive, 18 
intensive, 21, 25, 37, 412 
Lagrangian, 14, 119 
Vaschy-Buckingham theorem, 194 
Velocity potential, 273 
Viscometric flow, 135 
Viscosity, 132 (see also Laws for 
viscous fluids) 
bulk, 147 
definition of, 146 
dynamic, 147 
kinematic, 148 
physical origin, 133 
 
 
 
 
 
 
 
 
Viscous 
fluid, 156 
stress, 163, 173, 186 
Visualizations, 348 
Volume 
balance, 184 
source, 53 
Vortex, 275 
line, 258 
stretching, 263 
tube, 258 
velocity field, 260 
Vorticity 
diffusion of the, 265 
equation, 171, 261 
vector, 123, 257 
W 
Wall 
adiabatic, 15 
diathermic, 15 
Wall thermal problem 
constant temperature faces, 432 
shocks on the faces, 435 
Wave equation, 2 
Wavelet transform, 373 
Weak concentration, 83, 96