MECH4700 Fluid Mechanics, Fall2019 Nakamura

Are you ready for the final?

How was the first CFD simulation?

How was the midterm? Simple or complicated?

How are you today? We will have the exam today. Any questions?

How are you today? What did wd do last week? Do you  have any question?

A jet of water of 20 mm in diameter exits a nozzle directed vertically upwards at a velocity of 10 m/s.

ssuming the jet retains a circular cross-section, determine the diameter (m) of the jet at a point 4.5m above the nozzle exit. Take Pwater= 1000kg/m3.

Air enters a compressor  with a dnsity of 1.2 kg/m3 at a mean velocity of 4m/s in the 6cm by 6cm square inlet duct. Air is discharged form the compressor with a mean velocity of 3 m/s in a 5cm diameter circular pipe. Determine the mass flow rate and the density at outlet.

Do you remember what we discussed in last class? Do you have any question?

The hydraulic jack shown, the piston weights 1000N, determine the wight of the car which is supported by the jack when the gauge reading is 1.2 bar. Assume that the jack cylinder has a diameter of 0.4 m.

A king ordered a new crown to be made from pure gold (density = 19200kg/m3). When he received the crown he suspected that other metals may have been used in the construction. Archimedes discovered that the crown needed a force of 20.91 N to suspend when submersed in water and that is displaced 3.1 x10^-4 m3 of water. He concluded that the crown could not be pure gold. Do you agree or disagree?