如圖所示,某設(shè)備需潤(rùn)滑油的流量為Q=0.4cm3/s,油從高位油箱經(jīng)d=6mm,l=5m管道供給。設(shè)輸油管道終端為大氣,油的運(yùn)動(dòng)粘度為1.5×10-4m2/s,