TFS · Hydraulic & Fluid Applications · Problem 48PDFSolution in PDF ↓
TFS · Hydraulic & Fluid Applications · Problem 48
Problem & Solution
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Topic: Pipe flow / fluid mechanics — A viscous fluid flows through a 0.025 inch inside diameter tube at a flow rate of 3 cubic inches per minute.
Method: The fluid has a specific weight of a 100 pound force per cubic foot and a kinematic viscosity of 1 times 10 to the negative 5 square feet per second.
Formula reference: formula is only a function of the Reynolds number.
Key values: 100 pound force per cubic foot and a kinematic viscosity of 1 times 10 to the negative 5 square feet per second, 100 pound force per cubic foot times hf 19, 1 foot length of tube
Reference: reference handbook
✅ Answer: C
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Student questions asked in live office hours about this problem
OH 115
Q: When rounding intermediate values like diameter (0.0208 to 0.0202 feet), how precise should we be, and will the PE exam try to trick us with answer choices that exploit rounding errors?
A: Keep extra decimals in your calculator using the store feature to avoid transcription errors and preserve precision—small tubes are especially sensitive to diameter changes. The exam won't trick you with rounding-sensitive answer choices; they'll space answers evenly. Instead, watch out for autopilot mistakes where you solve before reading the entire question.