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如果顆粒層內的滲透流速V在層流范圍吋,达尔西法則表示,滲透流速与水面坡度h/l成正比,則V=k·h/l。式中k称为渗透系数,它决定于颗粒层及流体的性質。换句话说,对某一种流体的滲透系数k,以顆粒層的空隙度、顆粒大小以及形狀来表示。对这些因素人們进行研究并提出了結果。可是对颗粒大小来说,代表顆粒層粒徑的取法最通用的有如下二种湟恢质呛诳〉挠行Я絛e,另一种是魯卡的有效粒徑d_w。一般認为后一种的滲透系数的表示法在理論上比較合理并更可靠。
If the permeate velocity V in the particle bed is in the laminar flow range, Darcy’s law says that the permeate flow rate is proportional to the water surface gradient h / l, then V = k · h / l. Where k is called the permeability coefficient, which depends on the particle layer and fluid properties. In other words, the permeability coefficient k for a given fluid is expressed in terms of the porosity, particle size, and shape of the particle layer. People are researched on these factors and the results are presented. However, the particle size, particle size on behalf of the most commonly used method to take the following two kinds of 湟 湟 restore choking 挠> flexible row Я stencil e, the other is the effective particle size d_w Luka. It is generally believed that the latter representation of the permeability coefficient in theory is more reasonable and more reliable.