EGN 3358 - Spring 2014, Question Bank/Study Guide Test 2
Q. 1 : ANSWER THE FOLLOWING :
i)
Show that the area under- lying any process, on a T-S
diagram/plot/graph, gives us the Heat transfer during the
process
ii)
Show that the area enclosed by cycle/loop
Solution to HW2
1) Find the theoretical work required per unit mass for the isothermal compression of 800 m3 air
from 100KPa to 900 KPa in closed system.
2) For an ideal gas at a temperature of 0 C, calculate the work done per unit mass in an isothermal
e
EGN 3358 Spring 2014 - Question Bank/Study Guide - Test 1
Q. 1: ANSWER THE FOLLOWING:
i)
ii)
iii)
Why the pressure in a fluid increases linearly downwards as the
depth/distance from the free surface increases (Ans-p.2 of pp. 16)
Explain the sign conventio
UNIVERSITY OF CENTRAL FLORIDA
Mechanical, Materials & Aerospace Engineering EGN 3358 Thermo-Fluids-Heat Transfer, Fall 2007 Exam 2 (Open text book) November 08, 2006 from 10:30 to 11:45 1. (6 points) Saturated liquid water at 45 oC flows through cir
EGN 3358
Thermo-Fluids-Heat Transfer
Chapter 6: External Flow Fluid
Viscous and Thermal Effects
Part 2
EGN3358ThermoFluidsHeatTransfer
1
6.6: Convection Heat Transfer
Coefficient
q
h
T
W
Btu
2 ,
m C hr ft 2 F
Q
Where q =
A
Positive value when the heat
Thermo-Fluids Heat Transfer
Chapter 6: External Flow Fluid Viscous and Thermal Effects Part 1
6.1: Introduction
Define: Fluid: a substance that deforms continuously under the application of shear stress
Fox, Intro to Fluid Mechanics, 6th ed, 2004
EGN 3358
Homework #1
1. What is the difference between gage pressure and absolute pressure?
2. What is the difference between mass and molar mass? How are these two
related?
3. A 3-ft3 container is filled with 2-lbm of oxygen at a pressure of 80 psia. What is
the
EGN 3358 F15 CW 6: Fluids- Bernoullis Equation
EXAMPLE 1:
A siphon system with an inside diameter d = 0.075m is used to remove water
from container A to container B. when operational the steady flow rate through
the siphon is 0.03 m3/s. The temperature of
EGN 3343-58 CW 5 ( 4 Examp)-F15: Cycles(O/D/Du/C):
EXAMPLE 1:
with a low air temperature of227oC and a low pressure of 200kPa.If the work
output is to be 1000kj/kg calculate the maximum possible thermal efficiency
EXAMPLE 2:
In an ideal Diesel cycle the c
EGN 3343-58: CW - Steady Flow Energy Equation Problems
EXAMPLE 1
In a steady flow system, a substance flows at the rate of 4kg/s. it enters at
a pressure of 620kN/m2, a velocity of 300m/s, internal energy 2100 kJ/kg
and specific volume 0.37 m3/kg. It leav
EGN 3343-58 CW 3- N-F Processes: Constant Vol and Pr.
(Constant Volume and Constant Pressure Processes)
Example 1:
A copper vessel of mass 2 kg contains 6 kg of water. If the initial
temperature of the vessel plus water is 20 oC and the final temperature
EGN 3358: CW 8-Heat Transfer Problems (5 Probs)
Example 1:
A 2m long, 0.3 cm diameter electrical wire extends across a room at 15 C. Heat is
generated in the wire as a result of resistance heating, and the surface temperature
of the wire goes up to 152 C
EGN 3343-58 CW 4 N-F Processes-Isothermal and
Isentropic
Note: For Air: Adiabatic constant =k= Gamma = Cp/Cv=1.4; Cp = 1.005 kJ/Kg/K Cv
=kJ/Kg/K
Problem 1: 1 kg of air performs 2000 J of work on the surrounding area as it
expands isothermally to a pressur
Example 1
In a steady flow system, a substance flows at the rate of 4kg/s. it enters at a pressure of
620kN/m2, a velocity of 300m/s, internal energy 2100 kJ/kg and specific volume 0.37 m 3/kg. It
leaves the system at a pressure of 130 kN/m2, a velocity o
Homework #5a
1. An ideal dual cycle has a compression ratio of 18 and cutoff ratio of 1.1. The constant volume
heat addition pressure ratio is 1:1.1. The gas volume is 0.003 m3. The initial state is T1 = 291 K,
P1 = 90 kPa. The system can provide 4000 cyc
Homework #2
1) Find the theoretical work required per unit mass for the isothermal compression of 800
m3 air from 100KPa to 900 KPa in closed system.
2) For an ideal gas at a temperature of 0 C, calculate the work done per unit mass in an
isothermal expan
1. The pressure relative to the atmospheric pressure is called the gage pressure, and the
pressure relative to an absolute vacuum is called absolute pressure.
2. Mass m is simply the amount of matter; molar mass M is the mass of one mole in grams
or the m
Homework #4
1) Dry air is contained in a tank wit fixed volume at 200 oC and a pressure of 5
bar. Then the fluid is heated so that its temperature reaches up to 300 oC. If
the volume of the tank is 0.2 m3, find the transferred heat and final
pressure and
Example 1
A gas whose original pressure, volume and temperature were 140 kN/m2 , 0.1 m3
and 25oC respectively, is compressed such that its new pressure is 700 kN/m2 and
its new temperature is 60oC respectively. Determine the new volume of the gas.
1 1
2 2
guaranteed, what would be the maximum
permissible average velocity? Assume the
kinematic viscosity: 10"6 mzls ; and Re-
: CW:? #2.
mm
A 0.75 m long, smooth flat plate is being
subjected, in two different cases, to water
and then air flows. The velocity,
EGN 3343-58 CW 3- N-F Processes: Constant Vol and Pr.
(Constant Volume and Constant Pressure Processes)
Example 1:
A copper vessel of mass 2 kg contains 6 kg of water. If the initial
temperature of the vessel plus water is 20 oC and the final temperature