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iTeachChem
•
10mo ago
CorrodedCoffin
thermal conduction
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I
iTeachChem Helper
•
3/7/25, 3:31 PM
@Gyro Gearloose
I
iTeachChem Helper
•
3/7/25, 3:31 PM
Note for OP
+solved @user1 @user2...
+solved @user1 @user2...
to close the thread when your doubt is solved
. Mention the users who helped you solve the doubt
. This will be added to their stats
.
C
CorrodedCoffin
Click to see attachment
D
Dexter
•
3/7/25, 3:37 PM
wow
D
Dexter
•
3/7/25, 3:37 PM
interesting
D
Dexter
•
3/7/25, 3:38 PM
I
=
-KAdt
/dx
D
Dexter
•
3/7/25, 3:38 PM
but dt isn
't constant
D
Dexter
•
3/7/25, 3:38 PM
I will be dq
/dt
D
Dexter
•
3/7/25, 3:41 PM
im not getting the equations
O
Opt
•
3/7/25, 3:41 PM
Yum
. I started doing it and got a second order DE
Got general solution for one side
. Need to solve for other side
, input conditions
O
Opt
Yum. I started doing it and got a second order DE Got general solution for one s...
D
Dexter
•
3/7/25, 3:42 PM
Im getting three d wale terms
D
Dexter
•
3/7/25, 3:42 PM
dT
/dx in the RHS
dq
/dt in the LHS
O
Opt
•
3/7/25, 3:42 PM
Let me try from the beginning actually
D
Dexter
•
3/7/25, 3:43 PM
can
't find how to relate all these
O
Opt
•
3/7/25, 3:54 PM
Wait you took dT
/dx into consideration
? The rod has negligible heat capacity so I assumed its temperature can be ignored
.
O
Opt
•
3/7/25, 3:54 PM
Huh
O
Opt
•
3/7/25, 3:54 PM
Yeah
, then I messed up
O
Opt
Wait you took dT/dx into consideration? The rod has negligible heat capacity so ...
D
Dexter
•
3/7/25, 3:56 PM
the source and sink are at different temperatures so the heat flow should be through the rod as well
O
Opt
•
3/7/25, 3:56 PM
Yup tup
O
Opt
•
3/7/25, 3:56 PM
*yup
O
Opt
•
3/7/25, 3:56 PM
Crap I did all of this wrong
D
Dexter
•
3/7/25, 3:56 PM
O
Opt
•
3/7/25, 3:57 PM
Got this and all
O
Opt
•
3/7/25, 3:57 PM
Curve which like charging capacitor in RC circuit for comparison
.
O
Opt
•
3/7/25, 3:57 PM
Which makes sense
.
D
Dexter
•
3/7/25, 3:57 PM
time and temperature ko leke differential format banana hai
but idk what to with the dx
O
Opt
•
3/7/25, 3:57 PM
Since it should asymptote
O
Opt
Got this and all
D
Dexter
•
3/7/25, 3:57 PM
interesting
O
Opt
Curve which like charging capacitor in RC circuit for comparison.
D
Dexter
•
3/7/25, 3:58 PM
i see
O
Opt
•
3/7/25, 3:58 PM
$S
a
$ is
$m
{a
}s
_
{a
}
$
T
TeXit
•
3/7/25, 3:58 PM
Opt
O
Opt
Which makes sense.
D
Dexter
•
3/7/25, 3:58 PM
yeah It does
it
'll attain a steady state when T1
= T2
D
Dexter
yeah It does it'll attain a steady state when T1 = T2
O
Opt
•
3/7/25, 3:58 PM
Ta
= Tb
.
T1 and T2 are initial values
O
Opt
•
3/7/25, 3:59 PM
I didn
't want to get confused
O
Opt
Ta = Tb. T1 and T2 are initial values
D
Dexter
•
3/7/25, 3:59 PM
oh haan
O
Opt
I didn't want to get confused
D
Dexter
•
3/7/25, 3:59 PM
yesyes
D
Dexter
•
3/7/25, 3:59 PM
I can
't get the equations to work
O
Opt
•
3/7/25, 3:59 PM
Wait
, won
't that temp be
(T1
+T2
)
/2
?
O
Opt
Wait, won't that temp be (T1+T2)/2 ?
D
Dexter
•
3/7/25, 3:59 PM
why so
?
O
Opt
•
3/7/25, 3:59 PM
Just checking
.
O
Opt
•
3/7/25, 4:00 PM
Nvm it depends on initial difference
O
Opt
Nvm it depends on initial difference
D
Dexter
•
3/7/25, 4:00 PM
i see
O
Opt
•
3/7/25, 4:08 PM
IT ALL HECKING COLLAPSED
O
Opt
•
3/7/25, 4:08 PM
PRACTICALLY EVERYTHING CANCELLED
O
Opt
•
3/7/25, 4:09 PM
Final answer I got was exponential decay
O
Opt
•
3/7/25, 4:12 PM
$
\delta T
(t
)
=
(T
_2
- T
1
)e
^
{
-
\frac
{KA
(m
{1
}s
{1
}
+m
{2
}s
{2
}
)
}
{m
{1
}s
{1
}m
{2
}s
_
{2
}l
}t
}
$
T
TeXit
•
3/7/25, 4:12 PM
Opt
O
Opt
•
3/7/25, 4:13 PM
All conditions are satisfied
O
Opt
•
3/7/25, 4:13 PM
Afaik
O
Opt
•
3/7/25, 4:16 PM
@hardcoreisdead pls confirm
O
Opt
•
3/7/25, 4:16 PM
Because I didn
't take temp
.grad
. into consideration
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