| 单词 | head of water |
| 释义 | > as lemmashead of water b. A body of water kept at a particular height, esp. in order to provide a supply at sufficient pressure for a mill, turbine, etc.; the height of such a body of water, as a measure of the resulting pressure; (hence) pressure expressed in terms of the height of water that would produce it (cf. pressure head n. 1; see also Phrases 3q(a)). Frequently in head of water.velocity head: see the first element. ΘΚΠ the world > the earth > water > lake > pool > [noun] > artificially confined water > kept at a height head1677 1677 R. Plot Nat. Hist. Oxford-shire ix. 233 Lock-gates put down between every two of them..which will keep a head of water. 1724 D. Defoe Tour Great Brit. I. iii. 16 Here is a very large Pond, or Lake of Water, kept up to an Head, by a strong Battre d' eau, or Dam. 1791 R. Mylne 2nd Rep. Navigation Thames 15 Millers..working their Heads of Water in a spendthrift way. 1832 Examiner 289/1 He has dammed the stream to give it head. 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. 1907 H. Brown Irrigation vi. 120 A pressure due to 6¾ feet head of water. 1943 E. H. Lewitt Thermodynamics applied to Heat Engines (ed. 3) vi. 139 Water at 15° C. is injected under a constant head of 500 ft. 1986 E. Hall in A. Limon et al. Home Owner Man. (ed. 2) iii. v. 383 The cold water storage cistern is not sufficiently high above the shower sprinkler to provide the minimum 3ft (900mm) head of pressure. 2008 M. Kay Pract. Hydraulics (ed. 2) iv. 96 Atmospheric pressure drives a siphon and the absolute limit is 10 m head of water. < as lemmas |
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