计及血浆层的局部狭窄血管内血液脉动流分析
Analysis of Oscillatory Flow in Consideration of a Plasma Layer in Arterial Stenoses
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摘要: 本文研究了血浆层的存在对局部狭窄血管内脉动流动特性的影响。分析表明,在狭窄区域内,血浆层的存在明显地改变了血液流动的速度分布、纵向阻抗和压力梯度等特性,但几乎不改变纵向阻抗和压力梯度的幅角;而且这种影响与Womersley数、狭窄程度等因素有密切关系。分析血浆层影响下动脉狭窄流的特性,对于认识动脉粥样硬化的病理特性有重要意义。Abstract: This paper presents the influences of plasma layer on the oscillatory flow inarterial stenosis. The analysis demonstrates that the existence of the plasma layer mayobviously change the characteristics of flow such as velocity-profiles, longitudinalimpedance and pressure gradient, but hardly change the phase of longitudinalimpedance and pressure gradient. Besides. such influences vary with a and degree ofstenosis. These analyses have Special physiological significance in blood circulation system.
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Key words:
- stenosis /
- plasma layer /
- tubular pinch effect /
- oscillatory flow /
- longitudinal impedance /
- smooth effects
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[1] John R.Womersley,Oscillatory Flow of a Viscous Liquid in a Straight,Rigid Circular Tube,Wadc.Technical Report TR.,1(1957),56-614. [2] 柳兆荣著,《心血管流体力学》,复旦大学出版社,上海(1986). [3] 吴驰、柳兆荣,动脉狭窄对血液流速的影响,上海力学.16(3)(1995),152-199. [4] 柳兆荣、覃开荣,血浆层对小血管中脉动流的影响,水动力学研究与进展,A辑,8(1)(1993),97-106. -
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