Calculating Average Linear Velocity: 1.66m/s to 1.73m/s

AI Thread Summary
The average linear velocity is calculated using a flow rate of 100L/min, which converts to 0.00167m³/sec. The cross-sectional area is determined using the formula πr², resulting in approximately 9.61x10^-4 m². Dividing the flow rate by the cross-sectional area gives an average linear velocity of 1.66m/s. However, there is a discrepancy with the expected value of 1.73m/s, attributed to rounding errors in intermediate calculations. For more accurate results, it is advised to minimize rounding during calculations.
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Homework Statement
Water flows through a tubular heat exchanger with a 35mm inner diameter tube at flowrate 100L per min. Calculate Reynold no. Re for the fluid. Temp is 70 degrees celcius. Density is 977kgm-3. Viscosity is 0.0004Pa s.
Relevant Equations
Average linear velocity
Reynold number Re
First i need the average linear velocity

100L/min =
0.1m3/min
0.00167m3/sec

Cross Sec Area = Pie r2
=pie(0.0175m)2
9.61x10-4 m2

0.0016m3/s / 9.61x10x-4m2
= 1.66m/s

But my notes say this should be 1.73 m/s

Once i have the average linear velocity i can calculate Re.
Help appreciated
 
Physics news on Phys.org
Do less rounding in the intermediate steps. You are rounding 1.67 to 1.6 and expecting to get an answer that is correct to the third decimal ...
 
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