【Daily Question No. 023】2018.08.17
Thread Content
A petrochemical plant uses Φ108mm*4mm steel pipes to transport crude oil. The flow rate of the crude oil is 36,000 kg/h, its density is 900 kg/m3, and its viscosity is 0.072 Pa·s. Determine which of the following flow types the crude oil exhibits in the pipe A. Laminar flow ； B. Transient flow ； C. Turbulence ； D. It cannot be determined. The reference answers will be visible after responding; scoring is granted by identifying the key points. A Correct: 3 Wealth, Incorrect: 1 Wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately.
the anser is D
Cross-sectional area for flow: A=0.785*0.1^2=0.00785 m2. Mass flux: G=Ws/A=36000/3600/0.00785=1273.89 kg/m2/s. Reynolds number: Re=d*G/μ=0.1*1273.89/0.072=1769