Reynolds Number 4-9E. The kinematic viscosity of a hydraulic oil is 75 cS. If it is flowing in a 1-in- diameter pipe at a velocity of 20 ft/s, what is the Reynolds number? Is the flow laminar or turbulent? 4-10M. The kinematic viscosity of a hydraulic oil is 0.0001 m2/s. If it is flowing in a 30-mm- diameter pipe at a velocity of 6 m/s, what is the Reynolds number? Is the flow laminar or turbulent? 4-11. A hydraulic system is operating at a Reynolds number of 1000. If the temperature increases so that the oil viscosity decreases, would the Reynolds number increase, decrease, or remain the same? Frictional Losses in Pipelines 4-12E. For the system in Exercise 4-9, find the head loss due to friction in units of psi for a 100-ft length of smooth pipe. The oil has a specific gravity of 0.90. 4-13E. The kinematic viscosity of a hydraulic oil is 100 cS. If it is flowing in a 3/4-in-diameter commercial steel pipe, find the friction factor in each case. a. The velocity is 15 ft/s. b. The velocity is 45 ft/s. 4-14M. For the system in Exercise 4-10, find the head loss due to friction in units of bars for a 100-m length of smooth pipe. The oil has a specific gravity of 0.90. 4-15M. The kinematic viscosity of a hydraulic oil is 0.0001 m2/s. If it is flowing in a 20-mm- diameter commercial steel pipe, find the friction factor in each case. a. The velocity is 2 m/s. b. The velocity is 10 m/s.