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I-12 Index<br />

Underflow gate, 566<br />

Uniform depth flow, 546<br />

Uniform flow:<br />

in an open channel, 535, 546<br />

in a pipe, 391<br />

potential, 287<br />

at a section, 112, 190<br />

Uniform flow field, 287<br />

U.S. standard atmosphere, see Standard atmosphere<br />

Units, 4<br />

conversion factors, 9, 725<br />

system of, 7<br />

Universal gas constant, 580<br />

Unsteady Bernoulli equation, 128<br />

Unsteady flow, 128, 152, 159, 174, 179,<br />

video V3.11, video V4.7, video V5.7<br />

Unstructured grid, 704<br />

Upstream velocity, 462<br />

Vacuum, 48<br />

Valve losses, 422<br />

Valves, 416, 423<br />

Vane, 653<br />

Vapor pressure, 23<br />

boiling, 23<br />

in barometer tubes, 49<br />

of common liquids, 12<br />

effect on cavitation, 24<br />

of water, 716<br />

Varied flow, 535<br />

Velocity:<br />

absolute, 176, 196, 218, 647<br />

average, 190<br />

friction, 406<br />

particle, 148<br />

relative, 176, 196, 218, 647<br />

time-averaged, 401<br />

Velocity distribution, see Velocity profile<br />

Velocity field, 148, 265, video V4.2, video V4.3,<br />

video V6.1, video V6.2<br />

Velocity gradient, 14<br />

Velocity head, 103, 124<br />

Velocity measurement, see Flow measurement<br />

Velocity potential, 284<br />

Velocity profile:<br />

between flat plates, 309<br />

in a boundary layer<br />

effect of pressure gradient on, 490<br />

laminar, 477, 482, 484<br />

turbulent, 484, 486<br />

in an open channel, 547<br />

in a pipe<br />

laminar, 313, 392, video V8.9<br />

power law, 406<br />

turbulent, 405, video V8.9<br />

Velocity triangle, 648<br />

Vena contracta, 111, 121, 418<br />

Venturi, G., 28<br />

Venturi discharge coefficient, 444<br />

Venturi meter, 119, 443, video V3.10<br />

Viscometer:<br />

capillary tube, 33, video V1.5<br />

rotating cylinder, 35<br />

Stormer, 37<br />

Viscosity, 14, video V1.3<br />

absolute or dynamic, 15<br />

of air, 717, 718<br />

apparent, 16<br />

of common gases, 14, 714, 715<br />

of common liquids, 12, 714, 715<br />

eddy, 405<br />

kinematic, 20<br />

of U.S. Standard Atmosphere, 719, 720<br />

of water, 716<br />

Viscous dissipation, 397<br />

Viscous flow, 306<br />

Viscous stresses, 306<br />

Viscous sublayer, 404<br />

Visualization, flow, 151, video V4.6, video V4.9,<br />

video V7.16, video V9.13<br />

Volume flowrate, 112<br />

Volume flow meter, 446<br />

Volumetric dilatation, 266<br />

Volumetric efficiency, 659<br />

Volute, 653<br />

von Kármán, T., 29, 349, 479<br />

Vortex:<br />

bound, 519, video V4.6, video V9.19<br />

combined, 291, video V4.8<br />

forced, 291<br />

free, 101, 290, video V3.6, video V6.4<br />

horseshoe, 519, 556<br />

irrotational, 291<br />

Kármán trail, 501, video V6.15, video V9.9<br />

ring, video V4.1<br />

rotational, 291<br />

strength of, 291<br />

tornado, video VA.3<br />

trailing, 519, video V3.5, video V4.6,<br />

video V9.1, video V9.19<br />

Vortex shedding, 349, 501, 526, video V4.12,<br />

video V7.5, video V7.10, video V9.9<br />

Vortex street, 501, video V6.15, video V7.5,<br />

video V9.8<br />

Vorticity, 268<br />

production of, 471<br />

restrictions on Bernoulli<br />

equation because of, 126<br />

transport equation, 328<br />

Wake, 282, 468, video V9.6<br />

flat plate, 468<br />

streamlined object, 498<br />

vortex street, 501, video V6.15, video V9.9<br />

Wall shear stress, 391, 478<br />

Water horsepower, 659<br />

Water, table of properties, 716<br />

Water table, 634<br />

Watt, 7<br />

Wave:<br />

gravity, 536, video V10.4, video V11.3<br />

shock, see Normal shock<br />

surface, 536, video V9.12, video V10.3,<br />

video V10.4, video V10.5, video V11.3<br />

Wave motion, 538<br />

Wave speed:<br />

open channel flow, 636<br />

sound, 22, video V11.2

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