一、狭窄管内的流动 1.1 定常流狭窄管内的血液流动,是把血液作为牛顿流体,进行流体力学的理论处理。在小血管内放入测定装置直接测量流速、压力和剪切应力,显然对流动会给以大的扰动。在流线沿定常流方向收敛时,因流体微粒受到加速,压力降低比均匀管的要大些。在流线发散时,流体微粒减速,压力降低比均匀管 First, the narrow tube flow 1.1 constant flow Narrow tube blood flow is to use the blood as Newtonian fluid, fluid mechanics theoretical treatment. In the small blood vessels placed in the measuring device to directly measure the flow rate, pressure and shear stress, it is clear that the flow will give a large disturbance. As the streamline converges along a constant flow direction, the pressure drop is somewhat larger than that of a uniform tube because the fluid particles are accelerated. As the streamline diverges, the fluid particles slow down and the pressure decreases more than the uniform tube