一种用于过滤布等效孔径测量的方法

A novel method to measure the equivalent pore size of filter fabric

利用液体压强随深度增加和冒泡试验法原理,设计出一种通过稳定冒泡现象测量过滤布等效孔径的方法。此法首次将样品垂直放置,气体和液体被分置于样品两侧,使样品上液体压强分布不同,而气体压强分布相同。气体压强将气泡顶出液体侧,气泡冒出的数量随液体深度的增加而减少直至消失。在样品上测得任意6点的孔径值,取平均值作为等效孔径,用不确定度概念来标定等效孔径的散布范围。通过测量5块不同的样品,计算出孔径值的不确定度均小于3.00,验证了本方法的可行性以及测量仪器的稳定性和可重复性。

In this paper, a novel measurement method is given based on a principle that liquid pressure increases with the increment of liquid depth. The method can be used to measure the pore size of filter fabric through a stable bubbling phenomenon. The sample is placed vertically for the first time, and liquid and gas are separated by the sample. Meanwhile, the distribution of liquid pressure on the sample is different, but the distribution of gas pressure is the same. The bubbles are pushed into liquid by gas pressure and the number of the bubbles decreases and even disappears with increment of liquid depth. The diameters of 6 pores are measured by this method, and then the mean value of the pore size is re- garded as equivalent pore size of the sample. Scatter range of measurement value is evaluated by uncer- tainty. 5 different filter fabrics are measured, dated that the method for the measurement of and the uncertainty values are less than 3.00. It is vali- pore size is stable and reproductive.