(a) Given a length of pipe in a situation where the pipe diameter is

250mm

and the water flow rate is

0.088(m^(3))/(s)

, resulting in a Reynolds number value of 295784 .\ What is the dynamic viscosity value of the water?\ [CO2, PO2, C3] (5 marks)\ (b) Glycerin at

40\\\\deg C

with

\\\ ho =1252k(g)/(m)3

and

\\\\mu =0.27k(g)/(m)*s

is flowing through a

4cm

diameter horizontal smooth pipe with an average velocity of

3.5(m)/(s)

as shown in Figure Q3-1. Determine the pressure drop per

10m

of the pipe.\ [CO2, PO2, C4] (15 marks)\ (Total: 20 marks)\ 3\ Question 4\ A submarine can be treated as an ellipsoid with a diameter of

6m

and a length of

30m

. Determine the power required for this submarine to cruise horizontally and steadily at 50

k(m)/(h)

in seawater with density of

1025k(g)/(m^(3))

.\ Also determine the power required to tow this submarine in air whose density is

1.30k(g)/(m^(3))

. Assume the flow is turbulent in both cases.\ Note that power,

W_(drag )^()

is force times velocity,

W_(drag )^()=F_(D)V

\ Figure Q4-1\ [CO2, PO2, C4] (Total: 20 marks)

(a) Given a length of pipe in a situation where the pipe diameter is 250mm and the water flow rate is 0.088m3/s, resulting in a Reynolds number value of 295784 . What is the dynamic viscosity value of the water? [CO2, PO2, C3] (5 marks) (b) Glycerin at 40C with =1252kg/m3 and =0.27kg/ms is flowing through a 4cm diameter horizontal smooth pipe with an average velocity of 3.5m/s as shown in Figure Q3-1. Determine the pressure drop per 10m of the pipe. [CO2, PO2, C4] (15 marks) (Total: 20 marks) 3 Question 4 A submarine can be treated as an ellipsoid with a diameter of 6m and a length of 30m. Determine the power required for this submarine to cruise horizontally and steadily at 50 km/h in seawater with density of 1025kg/m3. Also determine the power required to tow this submarine in air whose density is 1.30kg/m3. Assume the flow is turbulent in both cases. Note that power, Wdrag is force times velocity, Wdrag=FDV Figure Q41 [CO2, PO2, C4] (Total: 20 marks)