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The Ergun equation, derived by the Turkish chemical engineer Sabri Ergun in 1952, expresses the friction factor in a packed column as a function of the modified Reynolds number. ==Equation== where and are defined as and where: is the modified Reynolds number, is the pressure drop across the bed, is the length of the bed (not the column), is the equivalent spherical diameter of the packing, is the density of fluid, is the dynamic viscosity of the fluid, is the superficial velocity (i.e. the velocity that the fluid would have through the empty tube at the same volumetric flow rate), and is the void fraction of the bed (bed porosity at any time). 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「Ergun equation」の詳細全文を読む スポンサード リンク
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