Problem Set # 7- March 2014
MECH 375
Problem Set # 7
Given: Friday, March 07
Recommended Completion Date: Monday, March 12
Do not submit for grading
Problem 1: Consider forced convection from a slender streamlined object in cross flow, as shown in the
fig
Department of Mechanical Engineering
MECH 375: Heat Transfer-1 Final Examination [Friday April 24, 2009]
Notes: This is an only open textbook exam. Only summary sheets provided by
the instructor are allowed; Exam period: 2:30 hrs.
Problem 1: Heat transfer
Solutions Problem Set # 8- Winter 2009
MECH 375
Solutions - Problem Set # 8
Problem 1:
D
T; U
Tw
Air
Given: Air at T= 25C; U=0.5 m/s.
Incandescent bulb of 50 W; Tw= 140C; bulb
diameter, D = 50 mm
Assumptions: Steady-state fluid flow and heat
transfer in c
Problem Set # 8- March 2014
MECH 375
Problem Set # 8
Given: Fri. March 14
Recommended Completion Date: Wed. March 19
Do not submit for grading
Problem 1: Air at ambient temperature of 25C and a velocity of 0.5 m/s flows over a 50 W incandescent
bulb whose
Midterm-Winter 2009-Section 201, March 2
MECH 375
Department of Mechanical Engineering
MECH 375: Heat Transfer-1 [30% of the Total Marks]
Notes: This is an only open textbook exam.Only summary sheets provided by
instructor attached to this exam are allowe
Solution to Final Exam 2009
MECH 375
Assumptions
1) One-dimensional steady-state radial heat conduction;
2) Classical fin theory applies;
3) Constant properties;
4) Compensated length approach adequate;
5) Radiation heat transfer negligible.
Problem 1:
Gi
UBC - Department of Mechanical Engineering
MECH 375 Heat Transfer
Lecture Handout # 5
Unsteady Heat Conduction in
Isotropic Materials
MECH 375
Heat Transfer
Prepared by:
N. Atabaki, Ph.D., P.Eng.
Fall 2013
Handout # 5: Unsteady Heat Conduction
MECH-375
ME
Problem Set # 1- September 2013
MECH 375
Problem Set # 1
Given: Wed., Sep. 04, 2013
Do not submit for grading
Recommended Completion Date: Mon., Sep. 09, 2013
Review Questions
1.
State the zero, first, and second laws of thermodynamics.
2.
What is the sta
Problem Set # 2- September 2013
MECH 375
Problem Set # 2
Given: Fri., Sep. 13
Recommended Completion Date: Fri., Sep. 20
Do not submit for grading
Problem 1: Radioactive wastes are packed in a thin-walled spherical container. The wastes generate
thermal e
Problem Set # 1- September 2015
MECH 375
Problem Set # 1
Given: Wed., Sep. 09, 2015
Do not submit for grading
Recommended Completion Date: Mon., Sep. 14, 2015
Review Questions
1.
State the zero, first, and second laws of thermodynamics.
2.
What is the sta
Problem Set # 2- Sep. 2015
MECH 375
Problem Set # 2
Given: Mon, Sep. 14
Recommended Completion Date: Mon., Sep. 21
Do not submit for grading
Problem 1: Radioactive wastes are packed in a thin-walled spherical container. The wastes generate
thermal energy
MECH375-September 2015
UBC - Department of Mechanical Engineering
MECH 375 Heat Transfer Section: 101
3 Credits / [3,0,1]
INSTRUCTOR:
Dr. N. Atabaki, P.Eng.,
Office:
Room 104, Rusty Hut
2275 East Mall, UBC, Vancouver
Phone#: 604 827 4065
E-Mail: natabaki@
Problem Set # 6- Feb. 2014
MECH 375
Problem Set # 6
Given: Wed., Feb. 12
Recommended Completion Date: Wed., Feb. 19
Do not submit for grading
Problem 1: A plate of stainless steel ( = 7817 kg/m3; c = 460 J/kg-C; k = 19 W/m-C) has thickness of
3 cm and is
Solutions Problem Set # 7- Winter 2009
MECH 375
Solutions - Problem Set # 7
Problem 1:
Given: As = 0.02 m2; Tw = 75C; T = 25C
= 1 kg/m3; cp = 1000 J/kg-C; k = 0.025 W/m-C
U, T
Tw
Experimental results:
Run 1: U = 5 m/s; qtotal= 200 W; D1 = 0.01 N
Run 2: U
Solutions Problem Set # 9- Winter 2009
MECH 375
Solutions - Problem Set # 9
Problem 1:
Given: T= 27C; Cable heat dissipation rate:
qloss / L =30 W/m; D = 25 mm
Assumptions: Steady-state free convection heat
transfer; Radiation negligible
L
g
Tw
Elec.
Wire
Solutions Problem Set # 10- Winter 2009
MECH 375
Solutions - Problem Set # 10
Problem 1:
a) eb = T 4 = 5.669 10 8 5800 4 = 6.415 107 W/m 2
Assumption: Sun is a black body at 5800K
b) and c)
2.8976 10-3
= 4.996 107 m
5800
C1
3.7418 10-16
=
=
= 8.4435 1013
Solutions Problem Set # 6- Winter 2009
MECH 375
Solutions - Problem Set # 6
Problem 1:
Given: solid = 7817 kg/m3; csolid = 460 J/kg-C; Ti = 500C;
T= 40C; h = 150 W/m2-C; k = 19 W/m-C; 2L = 0.03 m
h, T
h, T
Assumptions: Radiation negligible; 1-D, unsteady
Solutions Problem Set # 5- Winter 2009
MECH 375
Solutions - Problem Set # 5
Problem 1:
Given: solid = 5000 kg/m3; csolid = 1000 J/kg-C;
Ti = 1000C; T= 200C; h = (T-T)0.25
Tt=30min= 523.4C; D = 0.04 m
g
Assumptions: LPA valid; Radiation negligible;
unstead
Solutions Problem Set # 2- Winter 2008
MECH 375
Solutions - Problem Set # 2
Problem 1:
Assumptions: 1-D Steady-state radial heat conduction with Source term
(Sconstant)
a) qgen=?
ro
qgen = SdV
0
r 2
= So 1 4 r 2 dr
ro dV
0
ro
qgen
ro
qgen
qgen
1 3 1 r5
Solutions Problem Set # 3- Winter 2009
MECH 375
Solutions - Problem Set # 3
Problem 1:
Well-stirred liquid: h , T
Steady-state operation data:
Sleeve
r1 = 0.03 m; r2 = 0.035 m
L = 1.0 m; T = 235.17 oC
T2
Heater
r2
T1
r1
T1 = 252 oC; T2 = 250 oC
Total powe
Solutions Problem Set # 4- Winter 2009
MECH 375
Solutions - Problem Set # 4
Problem 1:
Tw
h, T
L
x
a
a = 0.01 m
L = 0.08 m
Given: krod = 138.56 W/m-K; Tw = 118C; h = 20 W/m2-K and T = 18C
Assumption: i) SS, 1-D heat conduction problem with constant proper
Sol-Midterm-Winter 2009-Section 201, March 2
Problem 1 (50%)
MECH 375
Given: Ti = 40oC; T = 110oC;
h
D
470 W/m 2 -K
Vegetable properties approximate water
D =12cm and H =10 cm
H
Assumptions: Unsteady heat conduction
(heating) with constant properties; Rad