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ENGG252 (DB225) Engineering Fluid Mechanics

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The gage pressure in

a pipe is measured by a manometer containing mercury (

r = 13,600 kg/m3

). The top of the

mercury is open to the atmosphere and the atmospheric pressure is 100 kPa. If

the mercury column height is 57 cm, the gage pressure in the pipe is

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Water is compressed from 80 kPa to 2400 kPa at constant

temperature. The initial density of water is 1000 kg/m

3

and the

isothermal compressibility of water is

a = 4.8x10-5 atm-1. The final density of the water is

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The surface tension of

soap water at 20

°C is ss = 0.025 N/m. The gage pressure inside a soap bubble of diameter 4 cm at 20°C is

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The difference

between the energies of a flowing and stationary fluid per unit mass of the

fluid is equal to

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The specific gravity of a fluid is specified to be 0.85. The specific

volume of this fluid is

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The density of a

fluid decreases by 10 percent at constant pressure when its temperature

increases by 10

°

C. The coefficient of volume expansion of this fluid

is

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A viscometer constructed of two

30-cm-long concentric cylinders is used to measure the viscosity of a fluid.

The outer diameter of the inner cylinder is 9 cm, and the gap between the two

cylinders is 0.18 cm.

The inner cylinder is rotated at 250

rpm, and the torque is measured to be .155 N

× m. The viscosity of the fluid is

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A 1.04-mm-diameter glass

tube is inserted into water at 20°C in a cup. The surface tension of water at

20

°C is ss

= 0.073 N/m. The contact angle can be taken as zero degrees. The

capillary rise of water in the tube is

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The speed of a

spacecraft is given to be 1250 km/h in atmospheric air at 25

°

C. The Mach number of

this flow is

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The dynamic viscosity

of air at 20

°C and 200 kPa is 1.83x10-5

kg/m

×s. The kinematic viscosity of air at this state is

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