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    • 9. 发明申请
    • METHOD AND SYSTEM FOR OBTAINING DIMENSION RELATED INFORMATION FOR A FLOW CHANNEL
    • 用于获取流量信道尺寸相关信息的方法和系统
    • US20150164341A1
    • 2015-06-18
    • US14334367
    • 2014-07-17
    • TEAM MEDICAL, LLC
    • WARREN P. HEIM
    • A61B5/026A61B5/00A61B5/02
    • A61B5/026A61B5/02007A61B5/72A61B8/06
    • A method and system for determination of dimension related information such as volumetric flow rate(s) of a fluid flowing through a channel. In one implementation, the method and system analyzes temporal changes in a moving fluid's velocity profile to calculate the fluid channel dimensions. In turn, the fluid channel dimensions and the fluid velocity profile data may be combined to calculate the volumetric flow rate of the fluid flowing through the channel. In this regard, the geometry of the channel can be characterized using dimensionless variables that relate dimensions, such as the radius across a circular cross-section, to the largest extent of a dimension. For example, in the case where the channel is a cylindrical tube and a pressure gradient is applied long enough for the fluid to have reached a steady state, the dimensionless radius will be the radius at any point divided by the overall radius of the tube. One or more dimensionless variables can be used to characterize geometries: for instance, one dimensionless radius characterizes a circular tube and two dimensionless teams characterize an elliptical tube (one for the major axis and one for the minor axis). The time required for velocity profiles to change from one shape to another may be characterized by dimensionless time. Dimensionless time, in turn, uses the fluid's viscosity and density along with time and overall channel dimensions and may be used in combination with at least one velocity profile to calculate the volumetric flow rate of the fluid flowing through the channel.
    • 用于确定尺寸相关信息的方法和系统,例如流过通道的流体的体积流量。 在一个实施方案中,该方法和系统分析移动流体的速度分布的时间变化以计算流体通道尺寸。 反过来,流体通道尺寸和流体速度分布数据可以被组合以计算流过通道的流体的体积流量。 在这方面,可以使用无量纲变量来表征通道的几何形状,其将尺寸(例如圆形横截面上的半径)与尺寸的最大程度相关联。 例如,在通道是圆柱形管并且施加足够长的压力梯度以使流体达到稳定状态的情况下,无量纲半径将是在任何点除以管的总半径的半径。 一个或多个无量纲变量可用于表征几何形状:例如,一个无量纲半径表征圆形管,两个无量纲的组合表征椭圆管(一个用于长轴,一个用于短轴)。 速度分布从一个形状变为另一个形状所需的时间可以是无量纲时间的特征。 无尺寸时间反过来又使用流体的粘度和密度以及时间和总体通道尺寸,并且可以与至少一个速度分布组合使用,以计算流过通道的流体的体积流量。