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

[sci0x]

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

 

[Orodruin]

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 ...