| 释义 |
Redwood, n.2|ˈrɛdwʊd|
[The name of Sir Boverton Redwood (1846–1919), British chemist.]
a. Redwood viscometer: either of two types of viscometer (differing in the ranges of viscosity for which they are suitable), which were designed by Redwood and are used esp. to measure the viscosity of petroleum and its products.
[1886Jrnl. Soc. Chem. Industry 29 Mar. 131/1 He had been in the habit of using one of Mr. Redwood's instruments for determining viscosities.] 1896B. Redwood Petroleum II. ix. 605 The Redwood viscometer..is a modification, designed by the author in 1885, of the instrument formerly used at the Battersea Works of Price's Patent Candle Company. 1931G. Barr Monogr. Viscometry iv. 96 Liquids for which the Redwood No. II viscometer is specified..are difficult to free from suspended impurities. 1949A. C. Merrington Viscometry v. 58 The calibration of a Redwood viscometer with a number of oils using an apparatus of the Thorpe and Rodger type. 1972Harker & Allen Fuel Sci. vii. 98 The instrument most commonly used in the United Kingdom to measure viscosity is the Redwood Viscometer... The two standard instruments are the No. 1 and the No. 2 Redwood viscometers. The former is used for thin oils having viscosities of less than 2,000 Redwood seconds, and the latter for more viscous oils. 1973A. L. Mills in Hobson & Pohl Mod. Petroleum Technol. (ed. 4) xx. 730 These instruments are now rarely used except perhaps for black oils... In fact, the method of viscosity determination using the Redwood viscometer has been deleted from the Institute of Petroleum ‘Standard Tests’.
b. Redwood second (also second Redwood): a unit of viscosity used in conjunction with Redwood viscometers and equal to one second of the time required for a given quantity of fluid to pass through a capillary in the instrument. So Redwood time, Redwood unit, Redwood viscosity, etc., and with ellipsis of second word.
1913Petroleum World June 272/1 The remaining three columns respectively give their colour, density at 20° C. and viscosity at 20° in Redwood units. 1930Engineering 5 Sept. 308/1 The fuel used throughout this test was Mexican boiler oil with..a viscosity of 200 secs. Redwood. 1949A. C. Merrington Viscometry v. 57 The results are normally expressed as ‘Redwood seconds’ at the temperature of the test. Ibid. A Redwood time of TR seconds. 1967A. S. Brunjes in Bland & Davidson Petroleum Processing Handbk. xii. 32 The Kinematic, Saybolt, Universal, redwood [sic] No. 1, and Engler scales. 1973P. J. King et al. in Hobson & Pohl Mod. Petroleum Technol. (ed. 4) vi. 215 Reference to..viscosities expressed in terms of Redwood seconds..is still found in the literature. 1973J. G. C. Pope in Ibid. xviii. 654 The viscosity of relatively mobile oils is recorded as so many seconds Redwood I {at} 100° F. 1973W. H. Thomas in Ibid. xxv. 860 When the Redwood viscosity requirements are quoted in specifications the usual procedure is to determine viscosity in kinematic or dynamic units and to convert these into Redwood by means of a conversion chart. |