| 单词 |
coolant |
| 释义 |
coolant|ˈkuːlənt|
[f. cool v.1 + -ant1, after lubricant a. and n.]
A cooling agent; esp. (a) a fluid applied in machining operations to a cutting-tool in order to cool it and lessen friction; (b) a cooling medium in an internal-combustion engine or the like. Also attrib.
1930H. J. French Quenching of Steels iv. 100 Coolant circulation. Ibid. vii. 156 A wide variety of coolants are encountered in commercial heat treatment practice but the five..generally employed are (1) water in baths and sprays, (2) dilute sodium hydroxide solutions, (3) sodium chloride brines, (4) oils or oil-water emulsions, and (5) air. 1939Flight 7 Dec. 464/1 The coolant is circulated by a centrifugal pump of ample capacity. 1941Edgar Allen News May 736 A coolant should be used with these tools, just as with high speed steel tools. 1954Life 4 Jan. 89 Fuel acts as its own coolant, circulates from core through heat exchange boiler. 1956Planning XXII. 108 The only method so far discovered is to draw off the heat from the reactor by circulating a gas or liquid coolant. 1958Jrnl. Iron & Steel Inst. CLXXXVIII. 87/1 The employment of water coolants has been found advantageous over dry or oil-cooled working for the machining of cast iron. 1968Times 7 Nov. 3/2 Super-conductivity..can at present be brought about only at such low temperatures that liquid helium must be used as a coolant. |
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