[問題] 單元操作

[ivy7132000 (ivy)]

研究了很久  這題一直不知該怎麼寫  小妹愚笨  麻煩大家幫忙

A vertical cylindrical settler-separator is to be designed for separating a
mixture flowing at 20.0 m3/h and containing equal volumes of a light
petroleum liquid(密度b=875 kg/m3) and a dilute solution of wash water(密度
a=1050
kg/m3).
Laboratory experiments indicate a settling time of 15 min is needed to
adequately separate the two phases.
For design purposes use a 25-min settling time and calculate the size of the
vessel needed, the liquid levels of the light and heavy liquids in the
vessel, and the height hA2 of the heavy-liquid overflow.
Assume that the ends of the vessel are approximately flat, that the vessel
diameter equals its height, and that one-third of the volume is vapor space
vented to the atmosphere.

題目要求hA2的高度   有給答案  hA2=1.537m


是要先算質量流率嗎???  還是要算什麼???  麻煩各為指點了  感激不盡!!

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