论文部分内容阅读
液体在细管中流动时,如果管中出现气泡,液体流动就要受到阻碍,气泡多了就能堵住管道,使液体不能流动,这一物理现象叫做“气体栓塞”。气体进入血管,形成气体栓塞,危及患者生命,在临床上仍有所见。产生气体栓塞的原因是由于液体表面张力的存在,弯曲液面对其下层的液体作用一附加压强。对于凹的液面,液体内部压强小于液体外部压强,附加压强指向液外,如图一所示。这附加压强对于血管中的一段静止血柱,气泡两
Liquid flow in the thin tube, if bubbles appear in the tube, the liquid flow will be impeded, more bubbles will be able to block the pipe, the liquid can not flow, the physical phenomenon is called “gas embolism.” Gas into the blood vessels, the formation of gas embolism, endangering the lives of patients, there are still clinically seen. The cause of gas embolism is due to the liquid surface tension exists, the bending liquid to the underlying liquid an additional pressure. For concave liquid surfaces, the pressure inside the liquid is less than the pressure outside the liquid and the additional pressure points outside the liquid, as shown in Figure 1. This additional pressure on the blood vessels in a static blood column, two bubbles