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人体正常血液循环在医学上属于稳定流动,如果整个液体流速很大。各层间的流速相差便很大。相邻两层液体由于内摩擦力的作用,相互牵拉,形成涡(旋)流。形成涡流表明病人得了严重贫血症状。血液在主动脉中平均流速约为22厘米/秒。流至毛细血管时,由于毛细血管的总截面积约为主动脉面积的250倍,血流速度减慢,约为0.05—0.1厘米/秒,血液流动的截面积小,流速度就大,截面积大时,流速便小。
Normal human blood circulation in medicine is a steady flow, if the entire liquid flow rate is large. The difference between the velocity of each layer is very large. Two adjacent layers of liquid due to the role of internal friction, pulling each other to form vortex (spin) flow. The formation of eddy currents indicates that the patient has had severe anemia. The average blood flow in the aorta is about 22 cm / sec. Flow to the capillaries, the capillary’s total cross-sectional area of about 250 times the area of the aorta, blood flow slowed down, about 0.05-0.1 cm / sec, blood flow cross-sectional area is small, the flow rate is large, cut Large area, the flow rate is small.