- #1

sci0x

- 83

- 5

- 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

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