ce 2200 hw
The specific gravity of a fluid is specified to be 0.83. The specific volume of this fluid is _____ m3/kg. Solve this problem using appropriate software.
.0012
A 0.08-m3 rigid tank contains air at 3 bar and 122°C. The mass of the air in the tank is _____ kg. Solve this problem using appropriate software
.212
The specific gravity of mercury is 13.6. The specific weight of mercury is _____ kN/m3. Solve this problem using appropriate software.
133
The weight of a 15-kg mass at sea level is _____.
147.2
Water is heated from 2°C to 76°C at a constant pressure of 100 kPa. The initial density of water is 1000 kg/m3 and the volume expansion coefficient of water is β = 0.377 × 10-3 K-1. The final density of the water is _____ kg/m3. Solve this problem using appropriate software.
972.1
compressible flow
A fluid flow in which density varies significantly is called
incompressible flow
A fluid flow in which the density of the fluid remains nearly constant
internal flow
Correctflow is the flow if the fluid is completely bounded by solid surfaces.
Consider the flow of a fluid with viscosity μ through a circular pipe. The velocity profile in the pipe is given as u(r) = umax(1 − rn/Rn), where umax is the maximum flow velocity, which occurs at the centerline; r is the radial distance from the centerline; and u(r) is the flow velocity at any position r. Develop a relation for the drag force exerted on the pipe wall by the fluid in the flow direction per unit length of the pipe.
F/L=2nπμumax
What are Newtonian fluids?
Fluids whose shear stress is linearly proportional to the velocity gradient
Consider two identical small glass balls dropped into two identical containers, one filled with water and the other with oil. Which ball will reach the bottom of the container first?
The ball dropped in water
On a day in which the local atmospheric pressure is 99.5 kPa, answer each of the following. Take the density of mercury and water to be 13,560 kg/m3 and 1000 kg/m3, respectively. Why is a water barometer not very practical?
The column height would be too high.
Consider a soap bubble. What is the pressure inside the bubble compared to the pressure outside?
The pressure inside a soap bubble is greater than the pressure outside.
Consider a glass of water. Compare the water pressures at the bottom surface for the following cases: The glass is moving down at constant velocity.
The water pressure remains the same.
Consider a glass of water. Compare the water pressures at the bottom surface for the following cases: The glass is moving up at constant velocity.
The water pressure remains the same.
Consider a glass of water. Compare the water pressures at the bottom surface for the following cases: The glass is stationary.
The water pressure remains the same.
The rise or fall of a liquid in a small-diameter tube inserted into the liquid is known as the ____.
capillary effect
The viscosity of liquids _____ and the viscosity of gases _____ with temperature.
decreases,increase
true or false:A fluid can resist an applied shear stress by deforming
false
open channel flow
flow is the flow when the pipe is partially filled with the liquid and there is a free surface
external flow
flow of an unbounded fluid over a surface such as a plate, a wire, or a pipe.
Choose the correct relation for the capillary rise of a liquid between two large parallel plates at distance t apart inserted into the liquid vertically. Take the contact angle to be φ.
h=2σscosφ/(ρgt)
Consider a glass of water. Compare the water pressures at the bottom surface for the following cases: The glass is moving horizontally at constant velocity.
he water pressure remains the same.
For gases, the kinematic viscosity _____ with temperature.
increases
The specific weight of a system is defined as the weight per unit volume (note that this definition violates the normal specific property-naming convention). Is the specific weight an extensive or intensive property?
intensive property
unit for power
kW
Do liquids or gases have higher dynamic viscosities?
liquids
the ____ number of a flow is defined as the ratio of the speed of flow to the speed of sound in the flowing fluid
mach
when an airplane is flying at a constant speed relative to the ground is it correct to say the mach number of this airplane is also constant?
no
A fluid in direct contact with a solid surface sticks to the surface and there is no slip. This is known as the _____ condition.
no slip condition
The volume of an ideal gas is to be reduced by half by compressing it isothermally. Determine the required change in pressure.
p1
_____ is defined as the ratio of the density of a substance to the density of some standard substance at a specified temperature.
specific gravity
A process is said to be _____ if it involves no changes with time anywhere within the system or at the system boundaries.
steady
true or false: the flow of gases through a jet engine is internal flow since the fluid is completely bounded by the solid surfaces of the engine.
true
The no-slip condition is due to the _____ of the fluid.
viscosity
