| 单词 | velocity head |
| 释义 | > as lemmasvelocity head velocity head n. [head n.1 44.] the velocity pressure of a fluid expressed in terms of the height from which the fluid would have to fall to attain the velocity exerting this pressure. ΘΚΠ the world > matter > physics > mechanics > force > [noun] > pressure > fluid pressure > specific overpressure1819 head of steam1820 pressure head1856 velocity head1884 velocity pressure1904 impact pressure1919 impact head1928 1881 Encycl. Brit. XII. 462/2 v2/2g may be termed the head due to the velocity v.] 1884 A. Daniell Text-bk. Princ. Physics xi. 276 We may say that the velocity-head and the pressure-head are together equal to the total head. 1937 M. P. O'Brien & G. H. Hickox Appl. Fluid Mech. ix. 271 The true velocity head to be used in Bernoulli's equation is the average kinetic energy per unit weight of water flowing. 1979 A. L. Lydersen Fluid Flow & Heat Transfer i. 5 (caption) Pressure head (p/ρg) and velocity head (V2/2g) for frictionless flow from point 1 to point 2. < as lemmas |
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