脉动流在分叉管中通栓效果的晶格玻尔兹曼方法研究

Pulsation effect on thrombus in a bifurcation pipe studied by the lattice Boltzmann method

血栓引发的各种心血管疾病一直威胁着人们的健康.在已经产生血栓的血管中,脉动对于疏通血管有良好的作用.由于血液的粘滞作用以及红细胞的惯性,脉动流的频率会影响血管通栓的效果.在分叉管模型中,低压差的条件下,由于另一畅通管子的导通作用减少了回流,导致通栓效果不理想.通过增大压差和提高脉动流的振幅,降低畅通管子导通作用的影响,研究脉动流在分叉管中的通栓效果.研究发现,脉动低频通栓效果好,但是通栓需要的时间较长;高频通栓时间短,但是当频率高于一定值,则通栓效果不明显.细胞和管壁的摩察系数对通栓效果也有影响.

Cardiovascular diseases caused by thrombosis, has been influencing people＇s health. In a blocked blood vessel, pulsation flows have a positive effect on thrombus. Because of the blood viscosity and the inertias of red blood cells and the fluid, the frequency of pulsation flow influences the effect of dredge blood clots. Under the condition of low differential pressure, conduction of the another flow pipe reducing the pressure variation causes the effect of dredging blood clots unsatisfactory in the bifurcated pipe model. So we will increase the pressure difference and improve the amplitude of pulsation flow to reduce the influence of the conduction effect of expedite tube, then study the effect of dredge blood clots of pulsation flow in the bifurcated pipe. We find that low frequency pulsation flow has a good effect on dredge blood clots, but needs a relative long time. However, high frequency pulsation flow needs a less time, but the effect of dredge blood clots is not obvious if the frequency is higher than a certain value. The friction between cells and the walls of the tube also has an effect on dredge blood clots.