King Fahd University of Petroleum & Minerals
Mechanical Engineering Department
315': Heat Transfer
' Semester (121 Q
SECOND MAJOR EXAM
Instructor Name; Dr. Fahad Al—Sulaiman
‘StudentName: . . . .e_
I Time Ailonved: Twuhours Student ID# . . .—.*
2
Problem # 1 Part A
[16 points]
o
Under steady state conditions, air at 100 C is flowing over a surface of a thick stainless steel block (k
= 15 W/m.K) of constant cross sectional area. The temperature at position #1 (15 mm from the surface)
is 60oC whil
25 marks
Problem 1
Part A [ 5 markil
A two-dimensional object is subjected to isothermal conditions at its left and right
surfaces, as shown in the schematic. Both diagonal surfaces are adiabatic and the
depth of the object is L = 100 mm. Determine the tw
King Fahd University of Petroleum & Minerals
MECHANICAL ENGINEERING DEPARTMENT
ME 315: HEAT TRANSFER
Fall Semester 2014-2015 (141)
Major Exam # 2 Name L i
Instructor: Student #
Section#
Sunday November 30, 2014 Time Allowed: 2 hours
CLOSED B 00K/CLOSED NO
PROBLEM 6.3
KNOWN: Boundary layer temperature distribution.
FIND: Surface heat flux.
SCHEMATIC:
PROPERTIES: Table A-4, Air (Ts = 300K): k = 0.0263 W/mK.
ANALYSIS: Applying Fouriers law at y = 0, the heat flux is
T
y
u y
u
= k ( T Ts ) Pr exp Pr
y=0
PROBLEM 2.3
KNOWN: Hot water pipe covered with thick layer of insulation.
FIND: Sketch temperature distribution and give brief explanation to justify shape.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional (radial) conduction, (3)
PROBLEM 5.8
KNOWN: The temperature-time history of a pure copper sphere in an air stream.
FIND: The heat transfer coefficient between the sphere and the air stream.
SCHEMATIC:
ASSUMPTIONS: (1) Temperature of sphere is spatially uniform, (2) Negligible rad
PROBLEM 7.8
KNOWN: Flat plate comprised of rectangular modules of surface temperature Ts, thickness a and
length b cooled by air at 25C and a velocity of 25 m/s. Prescribed thermophysical properties of the
module material.
FIND: (a) Required power generat
PROBLEM 1.6
KNOWN: Heat flux and surface temperatures associated with a wood slab of prescribed
thickness.
FIND: Thermal conductivity, k, of the wood.
SCHEMATIC:
35 W/m2
35 C
15 C
0.06 m
ASSUMPTIONS: (1) One-dimensional conduction in the x-direction, (2)
PROBLEM 3.3
KNOWN: Temperatures and convection coefficients associated with air at the inner and outer surfaces
of a rear window.
FIND: (a) Inner and outer window surface temperatures, Ts,i and Ts,o, and (b) Ts,i and Ts,o as a function of
the outside air
PROBLEM 3.84
KNOWN: Composite wall with outer surfaces exposed to convection process.
FIND: (a) Volumetric heat generation and thermal conductivity for material B required for special
conditions, (b) Plot of temperature distribution, (c) T1 and T2, as wel
KING FAHD
UNIVERSITY OF PETROLEUM & MINERALS
ME 316: Thermofluids Laboratory
Experiment # 5
CENTRIFUGAL AIR COMPRESSOR
1) OBJECTIVES
a) To introduce the operational principle of a centrifugal compressor.
b) To study the performance characteristics of a mu
INTRODUCTION
Fans and compressors are gas movers; however, compressors are characterized by
high-pressure increase through the machine. It is widely accepted that if the density
change through the machine is more than 5% the machine is called a compressor
King Fahd University of Petroleum and Minerals
Mechanical Engineering Department
ME 315-03: HEAT TRANSFER
Spring Semester 2015-2016 (152)
Course Description: Introduction to heat transfer by conduction, radiation and
convection. Electric network analogy.
PROBLEM 9.24
KNOWN: Plate dimensions, initial temperature, and final temperature. Air temperature.
FIND: (a) Initial cooling rate, (b) Time to reach prescribed final temperature.
SCHEMATIC:
ASSUMPTIONS: (1) Plate is spacewise isothermal as it cools (lumpe
King Fahd University of Petroleum & Mmerals
Mechanical Engineering Departlnent
ME 315: Heat Transfer
Semester (11-12
SECOND MAJOR EXAM
DI. Moh—ammad Ag-Qahtgni . a
StudentName:-.:-_.l_ 7.4a.-» ' ~ .
Time Allowed: Two hours Student ID# .- .
CHECK YOUR SEC
King Fahd University of Petroleum & Minerals
Mechanical Engineering Department
ME 315 HEAT TRANSFER
(131) Semester 2013, Quiz 4
Time: 30 min
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Date: 25/12/2013
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Student ID #:
Student name:
uestion 1
Grade
Consider an opaq
PROBLEM 9.6
KNOWN: Heat transfer rate by convection from a vertical surface. 1m high by 0th wide. to
quiescent air that is 20K cooler.
FIND: Ratio of the heat transfer rate for the above case to that for a vertical surface that is 0.6111 high
by ]m Wide w
PROBLENI 11.7
KNOWN: Number. inner and outer diameters. and thermal conductivity of condenser tubes.
Convection coefficient at outer surface. Overall ﬂow rate. inlet temperature and properties of water
ﬂow through the tubes. Flow rate and pressure of cond
4.1.2 Homogeneous Equations
An nth order homogeneous equation has the form
an (x) y (n) + an
where an (x) ; an
for all x 2 I:
1
1
(x) y (n
1)
+ : : : + a1 (x) y 0 + a0 (x) y = 0;
(1)
(x) ; : : : ; a1 (x) ; a0 (x) are continuous on I and an (x) 6= 0
The di
Chapter 6
Sinusoidal Excitation of Circuits
6.1 The Sinusoidal Source
Adding a phase angle to argument shift it backward
cos t sin(t 90 )
o
sin t cos(t 90 )
o
sin t sin(t 180 )
o
cos t cos(t 180 )
o
sin(t ) sin t cos cos t sin
cos(t ) cos t cos msin t
PROBLEM 2.3
KNOWN: Hot water pipe covered with thick layer of insulation.
FIND: Sketch temperature distribution and give brief explanation to justify shape.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional (radial) conduction, (3)
Chapter 2: Kinematic Analysis Analytical Approach
2.1. Introduction
Kinematics is the study of motion without consideration of what causes the motion. In other words, the
input motion is assumed to be known and the objective is to find the transformation
4.2 Reduction of order
Given a 2nd order ODE
y 00 + P (x) y 0 + Q (x) y = 0
(1)
and a solution y1 ; nd a second solution.
Here we seek a second solution
y2 = uy1
Substituting in the dierential equation we get
u00 y1 + 2u01 y10 + uy100 + P (u0 y1 + uy10 )