第二章In a Hagen-Poiseuille flow, i.e. laminar pressure-driven flow in a circular pipe, if the pressure drop is doubled, the average and maximum velocities will _____. 在哈根-泊谡叶流中，当压降变为原来的两倍时，流体的平均和最大速度会_____。( )
答案:both double 均变为原来2倍
Boundary layer occurs in _____. 边界层存在于_____。( )The continuum hypothesis of fluid mechanics assumes that fluid can be _____. 流体力学的连续性假设是说，流体可以_____。( )A fluid flow may be laminar, turbulent or transitional, depending on its _____. 流体流动究竟是层流、过渡流还是湍流，取决于_____。( )To solve for the velocity distribution of a viscous flow, we should use _____. 对于黏性流体，欲求得其速度分布，应该采用_____。( )A liquid flows from a pipe of diameter into a pipe of diameter . The minor loss coefficient is _____. 某液体从直径为D的管道流入直径为2D的管道，其局部阻力系数K是 _____. ( )A liquid flow is first divided into three separate pipe flows and later they merge into a single stream again. In this process, the total head loss is _____. 某股液流先分为三股，随后又汇为一股。在此过程中，总压头损失为_____. ( )
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