ME315 S2015 Quiz # 11 04/15/2015
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Name:
Signature:
As shown in the right figure, a diffuse plate has a spectral emissivity
which is independent on the surface temperature. Recall the Wiens
displacement law:
.
a) Qualitatively draw the total emissiv

ME315 $2015 - Quiz # 4 0210212015
Number: Name: Signature:
Answer the Followin :
l
Consider a composite wall in the seriesparallel conguration, subjected to two constant surface
temperatures, and under steady-state condition.
i) Draw Mo types of effec

Problem 1 Solution
PROBLEM 7.32
KNOWN: Length, thickness, speed and temperature of steel strip.
FIND: Rate of change of strip temperature 1 m from leading edge and at trailing edge. Location of
minimum cooling rate.
SCHEMATIC:
ASSUMPTIONS: (1) Constant pr

PROBLEM 12.37
KNOWN: Metallic surface with prescribed spectral, directional emissivity at 2000 K and 1 m (see
Example 12.7) and additional measurements of the spectral, hemispherical emissivity.
FIND: (a) Total hemispherical emissivity, , and the emissive

PROBLEM 8.12
KNOWN: Internal flow with prescribed wall heat flux as a function of distance.
FIND: (a) Beginning with a properly defined differential control volume, the temperature distribution,
Tm(x), (b) Outlet temperature, Tm,o, (c) Sketch Tm(x), and T

PROBLEM 6.13
KNOWN: Variation of local convection coefficient with distance x from a heated plate with a
uniform temperature Ts.
FIND: (a) An expression for the average coefficient h12 for the section of length (x2 - x1) in terms of
C, x1 and x2, and (b)

PROBLEM 10.5
KNOWN: Long wire, 1 mm diameter, reaches a surface temperature of 126C in water at 1 atm while
dissipating 3150 W/m.
FIND: (a) Boiling heat transfer coefficient and (b) Correlation coefficient, Cs,f, if nucleate boiling
occurs.
SCHEMATIC:
ASS

ME315 $2015 Quiz # 9 03l1112015
Number: Name: Signature:
Bac round:
Consider a boundary layer problem. Clean air of temperature T00 and velocity U flows over a at plate
wetted by a t_h_ir_g layer of chemical liquid. The plate is heated and kept at a unifo

ME315 52015 Quiz # 3 - 01f21f2015
Number: Name: Signature:
True or false:
When we solve a heat diffusion equation,
(T) Boundary conditions are always needed to solve a heat diffusion equation
(F) Initial condition is always needed to solve a heat diffusio

ME315 $2015 Quiz # 8 - 03/06/2015
Number: Name: Signature:
Draw the Curves
For the isothermal at plate being heated by a freestream (i.e., T s< T on), sketch the thermal boundary layer
thickness as a function of x from 0 to L, and carefully draw the tempe

ME315 S2015 Quiz # 6 02/11/2015
Number:
Name:
Signature:
Circle your choice(s)
Under which of the following condition(s), we cannot directly apply shape factor method to solve a 2D or
3D heat conduction enclosed by two surfaces:
A.
B.
C.
D.
E.
Materials t

ME315 S2015 Quiz # 10 03/27/2015
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Name:
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Consider an internal flow through a pipe:
The entrance length is short and we can assume the flow is hydrodynamically and thermally fully developed
everywhere. As shown in the graph below, the flui

ME315 S2015 Quiz # 5 02/04/2015
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Name:
Signature:
Assigned on Wednesday 02/04/2015 and to be returned on Friday 02/06/2015 after class
True or false:
When we solve a steady-state fin heat transfer problem,
( T ) The 1D fin heat transfer equation do

ME315 S2015 Quiz # 1 01/14/2015
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Name:
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True or false:
( F ) Heat diffuses along the direction of the temperature increases
( F ) A higher temperature object contains more thermal energy than the lower temperature ones
( F ) Heat cannot b

ME315 $2015 - Quiz # 2 - 0112112015
Number: Name: Signature:
Rank their thermal conductiviy from high to low: (near room temperature, "1" being the highest)
(g) Silver (3) Glass
4- (ngoams ( 1) Diamond
(5 ) Air 1391%. Oil and Water
True or false:
(F) Ther