Experiment #1
Axial Heat Conduction in Rods
ME 321 Laboratory Report
Introduction:
The objective of this experiment is to use measured values of temperature to
determine the exact dimensions of two copper rods. To achieve this objective we have to
use the
Experiment # 4
Transient Convection Heat Transfer
ME 321 Laboratory Report
11/6/07
Justine Maresca
595108335
Introduction:
The objective of this experiment was to use the lumped capacitance method to
determine the Biot number and the heat transfer coeffic
Syllabus
2014 - 2016 Catalog Data:
Modes of heat transfer; material properties; One- and
two- dimensional conduction; Extended surfaces;
Forced and free convection; Heat exchangers;
Radiation; Shape factors; Idael and real surfaces.
Laboratories in conduc
Experiment # 5
Heat Exchangers
ME 321 Laboratory Report
Introduction:
The objective of this experiment was to determine experimentally and
theoretically the heat transfer coefficients using two heat exchangers. To achieve the
objective, two heat exchanger
PROBLEM 8.27
KNOWN: Inlet and outlet temperatures and velocity of ﬂuid ﬂow in tube. Tube diameter and length.
FIND: Surface heat ﬂux and temperatures at x = 0.5 and 10 m.
SCHEMATIC:
F’— 1. 10." ——+1
'—_‘>7;77,0=750C
u I
um = 0. 2 m/s
u,;=25°c “——'>
1) =
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 involves us
Experiment # 2
Composite Cylindrical Fins
ME 321 Laboratory Report
Introduction:
The objective of this experiment is to study the effects of heat transfer in
composite cylindrical fins. This objective will be achieved by taking temperature
measurements al
Introduction: The Fourier equation helps to numerically understand the rate of heat transfer of
substance based on its properties. The temperature gradient will be analyzed to show its relationship of
a brass cylinder with a reduced middle section. The ex
PROBLEM 7.17
KNOWN: Temperature, pressure and Reynolds number for air ﬂow over a ﬂat plate of uniform
surface temperature.
FIND: (a) Rate of heat transfer from the plate, (b) Rate of heat transfer if air velocity is doubled and
pressure is increased to 10
PROBLEM 3.108
KNOWN: Net radiative ﬂux to absorber plate.
FIND: (a) Maximum absorber plate temperature, (b) Rate of energy collected per tube.
SCHEMATIC:
f: J grad = W/mz
"' w-Line of‘ symmefr-y
AI alloy 1 (dT/dx =0)
75v=60°C x =A/2=0.1m
ASSUMPTIONS
PROBLEM 1.4
KNOWN: Dimensions, thermal conductivity and surface temperatures of a concrete slab. Efﬁciency
of gas furnace and cost of natural gas.
FIND: Daily cost of heat loss.
SCHEMATIC:
Furnace, m = 0.90
Natural gas. I /—
C9 = $0.01/MJ Warm air Concr
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:
, T(o)=66°C
73o=27 C T(69s)=55°C
——>
——>
—-——(>
D=IZ.7mm
ASSUMPTIONS: (1) Temper
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, T5, and Tm, and (b) T5,.- and Tm as a function of
the outside air tempe
PROBLEM 6.2
KNOWN: Form of the velocity and temperature proﬁles for ﬂow over a surface.
FIND: Expressions for the friction and convection coefﬁcients.
SCHEMATIC:
(10017;) =D+Ey +Fy2 -G'y5
-——5’
15:;1 =,u [A+2By—3Cy2] —A/J
0" y yzo y=0
Hence, the f
PROBLEM 2.11
KNOWN: One-dimensional system with prescribed thermal conductivity and thickness.
FIND: Unknowns for various temperature conditions and sketch distribution.
SCHEMATIC:
H—T —L=O.25m
i; g—x,Temperafure gradienf
k=50¥K _ T; a
Hx 9:
ASSUMPTIONS:
PROBLEM 4.41
KNOWN: Boundary conditions that change from speciﬁed heat ﬂux to convection.
FIND: The ﬁnite difference equation for the node at the point where the boundary condition changes.
SCHEMATIC:
” h, T”
Cls
m - ,n I | m,n I m +1,n
l . TA {’2 Q1 qz
PROBLEM 1.81
KNOWN: Conditions associated with surface cooling of plate glass which is initially at 600C.
Maximum allowable temperature gradient in the glass.
FIND: Lowest allowable air temperature, T.
SCHEMATIC:
ASSUMPTIONS: (1) Surface of glass exchange
PROBLEM 1.80
KNOWN: Uninsulated pipe of prescribed diameter, emissivity, and surface temperature in a room
with fixed wall and air temperatures. See Example 1.2.
FIND: (a) Which option to reduce heat loss to the room is more effective: reduce by a factor
PROBLEM 1.79
KNOWN: Dimensions, average surface temperature and emissivity of heating duct. Duct air
inlet temperature and velocity. Temperature of ambient air and surroundings. Convection
coefficient.
FIND: (a) Heat loss from duct, (b) Air outlet tempera
PROBLEM 1.78
KNOWN: Duct wall of prescribed thickness and thermal conductivity experiences prescribed heat flux
q at outer surface and convection at inner surface with known heat transfer coefficient.
o
FIND: (a) Heat flux at outer surface required to mai
PROBLEM 1.77
KNOWN: Temperatures at 10 mm and 20 mm from the surface and in the adjoining airflow for a
thick stainless steel casting.
FIND: Surface convection coefficient, h.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state, (2) One-dimensional conduction in the
PROBLEM 1.76
KNOWN: Thickness and thermal conductivity, k, of an oven wall. Temperature and emissivity, , of
front surface. Temperature and convection coefficient, h, of air. Temperature of large surroundings.
FIND: (a) Temperature of back surface, (b) Ef
PROBLEM 1.75
KNOWN: Thermal conductivity, thickness and temperature difference across a sheet of rigid
extruded insulation. Cold wall temperature, surroundings temperature, ambient temperature and
emissivity.
FIND: (a) The value of the convection heat tra