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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Capillary pressure ： ウィキペディア英語版 Capillary pressure In fluid statics, capillary pressure is the difference in pressure across the interface between two immiscible fluids, and thus defined as :$p\_c=p\_\}$ In oil-water systems, water is typically the wetting phase, while for gas-oil systems, oil is typically the wetting phase. The Young–Laplace equation states that this pressure difference is proportional to the interfacial tension, $\backslash gamma$, and inversely proportional to the effective radius, $r$, of the interface, it also depends on the wetting angle, $\backslash theta$, of the liquid on the surface of the capillary. :$p\_c=\backslash frac$ The equation for capillary pressure is only valid under capillary equilibrium, which means that there can not be any flowing phases. == In porous media== In porous media, capillary pressure is the force necessary to squeeze a hydrocarbon droplet through a pore throat (works against the interfacial tension between oil and water phases) and is higher for smaller pore diameter. The expression for the capillary pressure remains as before, ''i.e.,'' $p\_c=p\_\}$ However, the quantities $p\_c$, $p\_\}$ are quantities that are obtained by averaging these quantities within the pore space of porous media either statistically or using the volume averaging method.〔Jacob Bear: “Dynamics of Fluids in Porous Media,” Dover Publications, 1972.〕 The Brooks-Corey correlation〔Brooks, R.H. and Corey, A.T.: “Hydraulic properties of porous media,” Hydraulic paper no. 3, Colorado State University, 1964.〕 for capillary pressure reads :$p\_c\; =\; cS\_w^$ where $c$ is the entry capillary pressure, $1/a$ is the pore-size distribution index and $S\_w$ is the normalized water saturation (see Relative permeability) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Capillary pressure」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.