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held constant, the head loss will (a) double (b) triple (c) quadruple
(d) increase by a factor of 8 or (6) increase by a factor of 16. Explain.
What is hydraulic diameter? How is it defined? What is it equal to for a
circular pipe of diameter D?

Water at 10°C (Density= 999.7 kg/m* and dynamic viscosity=
1.307x10° परिः) is flowing steadily in a 0.20 cm diameter, 15 m long
pipe at an average velocity of 1.2 m/s. Determine (a) the pressure drop,
(b) head loss and (c) the pumping power requirement to overcome this
pressure drop.

Module 5
For each statement, choose whether it is true or false and discuss your

answer briefly. These statements concern a laminar boundary layer on a
flat plate.

1. At a given x location, if the Reynolds number were to increase, the
boundary layer thickness would also increase.

2. As outer flow velocity increases, so does the boundary layer
thickness.

3. As the fluid viscosity increases, so does the boundary layer thickness.

4. ಡೂ the fluid density increases, so does the boundary layer thickness.

Write the primary dimensions of the universal ideal gas constant Ry. (Use

the ideal gas law, PV ಎ nR,T, where P is pressure, V is volume, T is
absolute temperature, and n is the number of moles of the gas.)

The pressure drop Ap, for steady, incompressible viscous flow through
a straight horizontal pipe depends on the pipe length I, the average
velocity V, the fluid viscosity ம, the pipe diameter 0, the fluid density
‏,م‎ and the average “roughness” height e. Determine a set of
dimensionless groups that can be used to correlate data.

Consider laminar flow over a flat plate. How does the local friction

coefficient change with position?

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