中文摘要：

本文研究了血液中的声流问题.声流是液体中的一种稳定流体,主要由于声振动的吸收产生.当声波传播过程中遇到像坚硬的平面、圆柱面或者球面时,就会导致声流的产生.在关于边界条件所引起的声流的研究中,气泡有着重要意义.声孔效应主要是指在超声和气泡的共同作用下通过声流作用暂时性的打开细胞膜让外界的分子进入,之后细胞可以修复,其特点是损伤小,可修复.前人通过引入镜像法,对硬边界附近的孤立气泡产生的剪应力作了理论研究,并给出了剪应力最大值的推导方法和其对声孔效应的意义.本文将在此基础上,将硬边界附近单气泡模型扩展到双边界情况,将其应用于声流的研究和所产生的剪应力的计算.在双边界情况下,通过数值模拟计算的方式,具体分析了声流待测点位置,血液的粘滞系数,气泡的半径等相关参数对剪应力的影响.

英文摘要：

Acoustic streaming is a steady current flow in a fluid caused by the momentum transfer associated with the absorption of acoustic waves by the media.Acoustic streaming takes place in a viscous medium at the vicinity of a boundary such as planes,cylinders,or spheres.In case of that,bubbles play an important role.It is more effective as a sound current source than the hard object under the same conditions because of the compressibility of the bubbles.Sonorophore refers to that： the cell membrane is temporary open in the role of acoustic streaming to let the molecule enter,after that,the cells can be repaired by itself,which is characterized by small,repairable damage.Researchers have introduced imaginary method to study the shear stress induced by the isolated bubble near the hard surface and given the expression for the maximum shear stress and its significance on the effect of sonorophore.Interaction between bubble and the boundary has important effect in various fields so the study about this acoustic streaming is necessary for better understanding.An analytical model for acoustic streaming generated by single bubble excited by ultrasound between two rigid planes is developed.This model considers bubble′ oscillations considering the effect of the walls.In particular,the numerical calculations of shear stress applied to the walls in water and blood have been conducted using the model.It is found that the shear stress changes with distance between the bubble and the wall,and it is related with the observation position,the parameters of the fluid and the radius of the bubble.