PROBLEM 14.1
KNOWN: Mixture of O2 and N2 with partial pressures in the ratio 0.21 to 0.79. FIND: Mass fraction of each species in the mixture. SCHEMATIC:
pO2 p N2
MO M
=
0.21 0.79
2
= 32 kg/kmol
N2 = 28 kg/kmol
ASSUMPTIONS: (1) Perfect gas beh
Homework #7
Problem 1: Consider the following fluids, each with a velocity of = 5 / and a
temperature of ! = 20, in cross flow over a 10-mm-diameter cylinder maintained at
50: atmospheric air, saturated water, and en
Homework #1
Problem 1: 1.9
Problem 2: 1.21
Problem 3: 1.23
Problem 4: 1.41
(15 points)
(15 points)
(15 points)
(15 points)
Problem 5: In a cold and windy winter night a farmhouse is losing heat to its
surrounding environment through convection and radiati
Homework #4
Problem 1: 4.44
(15 points)
In a two-dimensional cylindrical configuration, the radial ( r ) and angular ( )
spacings of the nodes are uniform. The boundary at r=r i is of uniform temperature
T i . The boundaries in the radial direction are ad
Homework #3
Problem 1: 3.15 (10 points)
Consider a composite wall that includes an 8-mm thick hardwood siding, 40-mm by
130-mm hardwood studs on 0.65-m centers with glass fiber insulation
Homework #5
Problem 1:
A copper ball (D=2 cm) at an initial temperature of 900 K is suddenly dropped into a
large oil bath at a constant temperature of 300 K. Plot the ball temperature as a function
of time assuming a constant heat transfer coefficient of
Homework #1
Homework #1
Homework #1
Problem 5: In a cold and windy winter night a farmhouse is losing heat to its surrounding
environment through convection and radiation modes of heat transfer. Determine the
required heat generation rate within the house
Homework #2
Problem 1: 2.5
(15 points)
Problem 2: 2.14
(15 points)
Homework #2
Problem 3: 2.42 a, b (20 points)
Homework #2
Problem 4: 2.57
(15 points)
Problem 5: Design of the boiling water reactors (BWR) is guided by different heat
transfer limits. One
PROBLEM 1.41
KNOWN: Hot plate-type wafer thermal processing tool based upon heat transfer modes by conduction through gas within the gap and by radiation exchange across gap. FIND: (a) Radiative and conduction heat fluxes across gap for specified hot
PROBLEM 2.1
KNOWN: Steady-state, one-dimensional heat conduction through an axisymmetric shape. FIND: Sketch temperature distribution and explain shape of curve. SCHEMATIC:
ASSUMPTIONS: (1) Steady-state, one-dimensional conduction, (2) Constant prop
PROBLEM 13.1
KNOWN: Various geometric shapes involving two areas A1 and A2. FIND: Shape factors, F12 and F21, for each configuration. ASSUMPTIONS: Surfaces are diffuse. ANALYSIS: The analysis is not to make use of tables or charts. The approach invol
PROBLEM 12.1
KNOWN: Rate at which radiation is intercepted by each of three surfaces (see (Example 12.1). FIND: Irradiation, G[W/m ], at each of the three surfaces. SCHEMATIC:
2
ANALYSIS: The irradiation at a surface is the rate at which radiation i
PROBLEM 11.1
KNOWN: Initial overall heat transfer coefficient of a fire-tube boiler. Fouling factors following one year's application. FIND: Whether cleaning should be scheduled. SCHEMATIC:
ASSUMPTIONS: (1) Negligible tube wall conduction resistance
PROBLEM 6.1 KNOWN: Variation of hx with x for laminar flow over a flat plate. FIND: Ratio of average coefficient, h x , to local coefficient, hx, at x. SCHEMATIC:
ANALYSIS: The average value of hx between 0 and x is hx = hx hx Hence, 1 x C x h x dx
PROBLEM 5.1 KNOWN: Electrical heater attached to backside of plate while front surface is exposed to convection process (T,h); initially plate is at a uniform temperature of the ambient air and suddenly heater power is switched on providing a constan
PROBLEM 3.101
KNOWN: Dimensions of a plate insulated on its bottom and thermally joined to heat sinks at its ends. Net heat flux at top surface. FIND: (a) Differential equation which determines temperature distribution in plate, (b) Temperature distr
PROBLEM 3.51
KNOWN: Pipe wall temperature and convection conditions associated with water flow through the pipe and ice layer formation on the inner surface. FIND: Ice layer thickness . SCHEMATIC:
ASSUMPTIONS: (1) One-dimensional, steady-state condu
PROBLEM 3.1 KNOWN: One-dimensional, plane wall separating hot and cold fluids at T,1 and T ,2 , respectively. FIND: Temperature distribution, T(x), and heat flux, q , in terms of T,1 , T,2 , h1 , h 2 , k x and L. SCHEMATIC:
ASSUMPTIONS: (1) One-dim