Kinematic viscosity (运动粘度)=0.5 m2/s,thermal diffusivity(热扩散率)=0.2 m2/s, then Pr=()
第2题
A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs
第3题
A.the viscosity index
B.the fuel oil contents
C.the starting speed
D.the reading at the rack
第4题
第6题
A.the engines speed
B.the engines load
C.the fuel oil temperature
D.the fuel oil flow
第7题
A.in order that
B.because of
C.in order to
D.owing to
第8题
A、特征尺寸Lc(characteristic length, m)
B、流体密度(fluid density,)
C、特征速度V(velocity of the bulk fluid, m/s)
D、流体的动力粘度μ(dynamic viscosity,kg/(m·s) )
第9题
A.weight
B.internal friction
C.demulsibility
D.S.A.Enumber
第10题
A.viscosity
B.pour point
C.volatility
D.lower explosive limit
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