MEC441 – Fluid Mechanics 1

Tutorial 1-Submit by 17/3/2015

Q1.1 What is fluid?

Q1.2 What is the no slip condition?

Q1.3 Explain the “continuum” assumption in the analysis of fluid mechanics.

Q1.4 Explain the difference between intensive and extensive properties.

Q1.5 Define the terms density, specific gravity and specific weight.

Q1.6 What is vapor pressure? Explain the cavitation phenomena. What are the setbacks of

cavitation in mechanical equipment?

Q1.7 What is the sound? Can sound waves travel in vacuum? What influence the speed of

sound?

Q1.8 What is the Mach number? Explain the terms subsonic, sonic and supersonic flows.

Q1.9 Define the property viscosity. What is the difference in behaviour between Newtonian

and non-newtonian fluid? How does viscosity change with temperature?

Q1.10 Differentiate between dynamic (absolute) viscosity and kinematic viscosity.

Q1.11 A 100 liter container is filled with 1 kg of air at a temperature of 27 oC. What is the

pressure in the container?

Q1.12 What is the specific volume of oxygen at 300 kPa and 27 oC? Also calculate the

density.

Q1.13 Determine the density, specific gravity and mass of the air in a room whose

dimensions are 4m x 5m x 6m at 101.3 kPa and 25 oC.

Q1.4 A pump is used to transport water to a higher reservoir. If the water temperature is 20

oC, determine the lowest pressure that can exist in the pump without cavitation.

Q1.15 The analysis of a propeller that operates in water at 20 oC shows that the pressure at

the tips of the propeller drops to 2 kPa at high speed. Determine if there is a danger of

cavitation for this propeller.

Q1.16 Determine the speed of sound in air at a) 300 K and b) 800 K. Also determine the

Mach number of an aircraft moving ain air at a velocity of 330 m/s for both cases.