Answer:
1. it is laminar flow
2. it is not fully developed
3.Re=63.156
4. entrance length is the entrance diameter which is 4.1-mm-
Explanation:
A soft drink with the properties of 10 oC water is sucked through a 4.1-mm-diameter, 0.25-m-long straw at a rate of 4.1 cm3/s.
(a) Is the flow at the outlet of the straw laminar?
(b) Is it fully developed? To explain calculate
(c) the Reynolds number and
(d) the entrance length
note te following
For&pipe&flow:&
Re&<&2100 laminar&flow&
Re&>&4000 turbulent&flow&
kinematic viscosity of water at 10 oCis 1.267E-6m^2/S
Re=vl/k.viscosity
v=q/A
q=4.1 cm3/s=4.1*10^-6m3/s
A=3.142*0.0041/4
A=0.00322m2
v=0.000318m/s
l= 0.25-m
RE=0.000318m/s*0.25/( 1.267E-6m^2/S)
Re=63.156
since re<2100 , it is laminar flow
2. it is not fully developed
3.Re=63.156
4. entrance length is the entrance diameter wic is 4.1-mm-
