symmetrical flow

It is also found that the critical Rayleigh number Rac changes with slot widths, and there exists symmetrical and unsymmetrical oscillation for the oscillatory flow and heat transfer.

数值实验还表明，流动和换热出现振荡时的临界Rayleigh数Rac与开缝圆的开缝度有关，且流动和换热的振荡会出现对称振荡和非对称振荡两种情形。

Regarding asphalt pavement as an axial symmetrical body of multilayered saturation elastic half space, the fundamental thermal Biot consolidation theory and seepage flow equations are introduced.

将沥青路面视为多层饱和弹性半空间轴对称体，引入比奥渗流固结理论和渗流方程。

Compared with diode uncontrollable rectifier and phased thyristor rectifier, PWM rectifier has the advantage of symmetrical sinusoidal AC current, unity power factor operation and two-way flow of energy.

与二极管不可控整流或相控晶闸管整流器相比，PWM整流器具有网侧电流对称正弦、单位功率因数运行、能量能够双向流动的优点。