| 释义 |
irrotational, a. Dynamics.|ɪrəʊˈteɪʃənəl|
[ir-2.]
Not rotational; characterized by absence of rotation: said of fluid motion in which each elementary or infinitesimal part of the fluid has no rotation about its own axis.
1875Clerk Maxwell in Encycl. Brit. III. 44/1 The motion of a fluid is said to be irrotational when it is such that if a spherical portion of the fluid were suddenly solidified, the solid sphere so formed would not be rotating about any axis. 1880G. H. Darwin in Nature XXII. 95/2 Two vortices exercise very remarkable influences on one another, which are due to the irrotational motion of the parts of the fluid outside the vortices. 1883O. Lodge ibid. XXVII. 330/1 Portions [of ether] either at rest or in simple irrotational motion.
Hence irroˈtationally adv.
1881Maxwell Electr. & Magn. I. 117 A vector which is distributed irrotationally in all cases of electric equilibrium. 1881Nature XXIII. 475/2 A mass of fluid revolving irrotationally inside an imperfectly elastic cylindrical case. |