HVAC · Practice-Exam-2 · Problem 52PDFSolution in PDF ↓
HVAC · Practice-Exam-2 · Problem 52
Problem & Solution
Video Synthesis
Topic: Fluid flow / Reynolds number — 800gpm of gasoline, specific gravity 0.72 is transported through an 18-inch steel pipe.
Method: The kinematic viscosity of gasoline is 6 times 10 to the negative 6 square feet per second.
Key values: 1.01 feet per second, 800gpm of gasoline, 800 GPM
Reference: reference handbook
✅ Answer: C
Office Hours
1
Student questions asked in live office hours about this problem
OH 98: HVAC: Full Practice Exam #52
Q: Why don't you have to multiply the specific gravity of 0.72 to find the Reynolds number?
A: So this one was about finding the Reynolds number and I threw you a little red herring, which is that I gave you the specific gravity, which you did not need to use. And if you tried to use it, and you fell for the trap. So the definition of the Reynolds number is that it's the velocity times the diameter over the kinematic viscosity of new.