Question

1.Find the Reynolds number if a fluid of viscosity 0.4 Ns/m2 and relative density of 900 kg/m3 through a 20 mm pipe with a velocity of 2.5 m/s. Is the flow Laminar or Turbulent?

Note: If Reynolds < 2000 the flow is laminar
If Reynolds > 4000 the flow is turbulent
If 2000 < Re < 4000 it is transitional flow
Re = ρVL/η < 10^3 shows viscous force dominate. That is, viscous forces keep streamlines
constant so they flow steadily over each other in predictable path.
Re = Reynolds

2. At what temperature on the Fahrenheit scale will the temperature on a centigrade scale be three times that on a Fahrenheit scale?

Answer 1

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