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【简答题】
某厂如图所示的输液系统将某种料液由敞口高位槽A输送至一敞口搅拌反应槽B中, 输液管规格为φ38×2.5mm,已知料液在管中的流速为u m/s,系统的Σh f =20.6u 2 /2 J/kg。因扩大生产,一套同样的系统,所用输液管直径不变,而要求的输液量须增加30%,问新系统所设的高位槽的液面需要比原系统增高多少? 10分 ∵u 1 ≈0≈u 2 p 1 =p 2 于是gZ 1 =gZ 2 +Σh f g____=Σh f =20.6 4分 u= =2.39m/s 2分 Z 1 ′=Z 2 +20.6 =15.14m 2分 增高为:Z 1 ′-Z 1 =15.14-11=4.14m 2分
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