2022-11-27 21:34:52
瞬时流速算不出来.还缺条件,压差
不过按你现在给的条件能算平均流速
先算出流量Q=4/(5*60)=0.0133m/s
流速V=Q/s=0.0133/(3.14*0.1095*0.1095)=0.35m/s