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7/21/2019 Tutorial+1 heat
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TUTORIAL 1XU Xiaonan
09/02/2015
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Office
TAs: Xu, Xiaonan (xxuae@us!"#$
Lu, %ian&ie (&'ua&@connec!us!"#$
on), Ru*uan
(+son)a@connec!us!"#$ Office: R-121. (Lif 21, nea+ "e exi$
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A'icaions of ea T+ansfe+
Ai+ coniionin)
Ref+i)e+aion
ae+ "a+3esin)
4oe+ )ene+aion
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-oes of "ea +ansfe+
6onucion
Raiaion
6on3ecion
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6onucion
6onucion7ou+ie+s La
o'i 8ae+ (is "e+8a' conuci3i* #$
Te8e+au+e iffe+ence a'on) one i+ecion
ea f'ux
T"+ee necessa+* co8onens fo+ a conucion +o'e8
To of "e8 i'' e #non i+ec'* o+ ini+ec'* o ca'cu'ae
"e "i+
T1
T2
T1;T2
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6on3ecion
6on3ecion
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Raiaion
Raiaionefan?o'8ann La
B8issi3e oe+:
I++aiaion:
Aso+e i++aiaion:
Raiaion exc"an)e:su++ounin)
su+face
i++aiaion
e8issi3e oe+
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Bne+)* conse+3aion
T"e+8o*na8ic:
7i+s 'a: ea, o+# an Bne+)*Cesc+iion: An* "e+8o*na8ic s*se8 in an eui'i+iu8 sae ossesses
a sae 3a+ia'e ca''e "e ine+na' ene+)* !
c"an)e in ine+na' ene+)*
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Bne+)* conse+3aion fo+ a con+o' 3o'u8e
O3e+ a i8e ine+3a': Bs B)
Bin Bou
Closed systems
Steady-flow
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u+face Bne+)* a'ance
6onse+3aion Bne+)*(Insan in Ti8e$:
i" no 8ass an 3o'u8e, ene+)* so+a)e an
)ene+aion (3o'u8e+ic$ a+e no e+inen o "e ene+)*
a'ance, e3en if "e* occu+ in "e 8eiu8 oune *"e su+face
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Q1,A sua+e si'icon c"i (#D150/8E$ is of i" D588 on a siean of "ic#ness D188! T"e c"i is 8oune in a sus+ae suc" "a
is sie an ac# su+faces a+e insu'ae, "i'e "e f+on su+face is
exose o a coo'an! If F a+e ein) issiae in ci+cuis 8oune
o "e ac# su+face of "e c"i, "a is "e sea*?sae e8e+au+e
iffe+ence eeen ac# an f+on su+facesG
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Q2,A s"e+ica' ine+'anea+* +oe of 0!5?8 ia8ee+ conainse'ec+onics "a issiae 150! If "e +oe su+face "as an e8issi3i*
of 0!H an "e +oe oes no +ecei3e +aiaion f+o8 o"e+ su+faces,as, fo+ exa8'e, f+o8 "e sun, "a is is su+face e8e+au+eG
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Q3,Raioaci3e ases a+e ac#e in a 'on), "in?a''e c*'in+ica'conaine+! T"e ases )ene+ae "e+8a' ene+)* nonunifo+8'*
acco+in) o "e +e'aion , "e+e is "e 'oca' +ae of ene+)* )ene+aion
e+ uni 3o'u8e, is a consan, an is "e +aius of "e conaine+!
ea*?sae coniions a+e 8ainaine * su8e+)in) "e conaine+
in a 'iui "a is a an +o3ies a unifo+8 con3ecion coefficien h!
Oain an ex+ession fo+ "e oa' +ae a "ic" ene+)* is )ene+ae in
a uni 'en)" of "e conaine+! Use "is +esu' o oain an ex+ession
fo+ "e e8e+au+e Ts of "e conaine+ a''!
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Q4. Matlab to solve the F" o+e+ euaion
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Use -a'a o so'3e "e F" o+e+ euaion
8 45.3865 10 102 31813 0
s sT T
+ =