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Engineers this should be challenging

 
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Engineers this should be challenging - 11/17/2008 9:49:49 AM   
brute650i


Posts: 718
Joined: 7/21/2006
From: Rosedale, MS
Status: offline 		I am having trouble with this problem anyone think they can help me with it. The class is called advanced engineering mathematics.

Here we Go:




CAS PROJECT. Isotherms.
Find the steady-state solutions (temperatures) in the square plate in Fig. 294 with a = 2 satisfying the following boundary conditions.  Graph isotherms.
a) u = sin πx on the upper side, 0 on the others.
b) u = 0 on the vertical sides, assuming that the other sides are perfectly insulated.
c) Boundary conditions of your choice (such that the solution is not identically zero).

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RE: Engineers this should be challenging - 11/17/2008 10:00:52 AM   
OUTLAWED450S


Posts: 1279
Joined: 1/27/2001
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Status: offline 		im not an egineer but i can tell you if your not sure of the answer. always choose C....

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RE: Engineers this should be challenging - 11/17/2008 10:16:24 AM   
brute650i


Posts: 718
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From: Rosedale, MS
Status: offline 		I wish it was as easy as multiple guess but I'm spose to work it those 3 ways

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Post #: 3
RE: Engineers this should be challenging - 11/17/2008 6:00:06 PM   
camogrizz51


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Status: offline 		lol not that far into college yet

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RE: Engineers this should be challenging - 11/17/2008 6:18:23 PM   
fowheelin


Posts: 1754
Joined: 7/15/2005
From: Diamondhead, MS
Status: offline 		try these guys out, i bet they can help

http://www.youtube.com/watch?v=rLprXHbn19I

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Post #: 5
RE: Engineers this should be challenging - 11/17/2008 7:40:46 PM   
Fish700


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RE: Engineers this should be challenging - 11/17/2008 8:13:10 PM   
brute650i


Posts: 718
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From: Rosedale, MS
Status: offline 		good video I don't think Ive laughed that hard in a while.

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Post #: 7
RE: Engineers this should be challenging - 11/17/2008 8:21:25 PM   
Gumbo03


Posts: 883
Joined: 11/9/2003
From: Ruston,LA
Status: offline 		Is this Heat Transfer? Ive had HT but Ill have to think about this one.  Doesnt really seem like it would be that tough though!

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RE: Engineers this should be challenging - 11/17/2008 8:22:35 PM   
Gumbo03


Posts: 883
Joined: 11/9/2003
From: Ruston,LA
Status: offline 		Maybe use a Thermal resistance series.  Thats what direction Im lookin

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Post #: 9
RE: Engineers this should be challenging - 11/17/2008 8:28:50 PM   
brute650i


Posts: 718
Joined: 7/21/2006
From: Rosedale, MS
Status: offline 		yes the problem is about heat transfer solution by Fourier series. The book we are using for this class is terrible and also the teacher is foreign so that doesn't help either.

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Post #: 10
RE: Engineers this should be challenging - 11/17/2008 8:30:40 PM   
kleinwild


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Status: offline 		b

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Post #: 11
RE: Engineers this should be challenging - 11/17/2008 8:33:11 PM   
Rinny650


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Status: offline 		Not completely sure on all this. But maybe just maybe this link will help.

http://www.frigprim.com/articels/analsolv_1.html

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Post #: 12
RE: Engineers this should be challenging - 11/17/2008 8:35:53 PM   
brute650i


Posts: 718
Joined: 7/21/2006
From: Rosedale, MS
Status: offline 		camogrizz51 what year are you? 

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want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

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Post #: 13
RE: Engineers this should be challenging - 11/18/2008 10:32:47 AM   
alan_smith


Posts: 1233
Joined: 1/11/2007
From: Ruston, Louisiana
Status: offline 		Yeah, haven't gotten that far in the engineering curriculum yet!

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    • Post #: 14
    RE: Engineers this should be challenging - 11/18/2008 10:37:50 AM   
    Justin Q.

     

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    Status: offline     		My brain just went from fine to hurting in those 5 seconds of reading.

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    Post #: 15
    RE: Engineers this should be challenging - 11/18/2008 3:02:43 PM   
    camogrizz51


    Posts: 3820
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    From: Louisiana
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    quote:

    ORIGINAL: brute650i

    camogrizz51 what year are you? 


    sophmore, i have 32 credits not including this semester.  I'll have 45 hours after this semester,  Im taking it easy cause i took 18 hours last semester and i not doing that again lol

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    Post #: 16
    RE: Engineers this should be challenging - 11/18/2008 3:07:42 PM   
    duramax/660rhino


    Posts: 958
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    Status: offline     		PM ENGIE on here he's in school now for mechanical engineering 

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    Post #: 17
    RE: Engineers this should be challenging - 11/18/2008 4:14:30 PM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		Im a junior at Ole Miss but let me guess you go to LSU to

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    2005 white F-250 FX4 4X4

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    * 28x10 mudzilla's all around
    * moose module
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    want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

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    Post #: 18
    RE: Engineers this should be challenging - 11/18/2008 5:06:20 PM   
    Big_T


    Posts: 3089
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    Status: offline     		Which engineering are you?

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    RE: Engineers this should be challenging - 11/18/2008 5:12:43 PM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		Civil

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    2005 white F-250 FX4 4X4

    The Original FCP Brute Force 801
    * 28x10 mudzilla's all around
    * moose module
    * custom dual airbox snorkle
    * dynojet kit
    want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

    My Pics

    (in reply to Big_T)
    Post #: 20
    RE: Engineers this should be challenging - 11/18/2008 9:25:18 PM   
    Big_T


    Posts: 3089
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    Post #: 21
    RE: Engineers this should be challenging - 11/18/2008 9:32:28 PM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		Thanks alot BIG_T

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    2005 white F-250 FX4 4X4

    The Original FCP Brute Force 801
    * 28x10 mudzilla's all around
    * moose module
    * custom dual airbox snorkle
    * dynojet kit
    want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

    My Pics

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    Post #: 22
    RE: Engineers this should be challenging - 11/19/2008 10:47:02 AM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		would it be safe to assume since heat transfer on the verticle sides is 0. and on the others it is well insulated (meaning little to no heat trasfer) then the overall heat transfer would be 0 also? or is this a completly wrong assumption

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    2005 white F-250 FX4 4X4

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    Post #: 23
    RE: Engineers this should be challenging - 11/19/2008 11:47:00 AM   
    Big_T


    Posts: 3089
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    From: Milwakuee, WI
    Status: offline     		Ok, it's been 5 years since I've done this and I don't do a lot of hand HT calcs, especially using Fourier series so you'll have to bear with me for a moment.

    You'r just talking aout B) now, right?  Assuming you are:
    the heat transfer on the sides is not 0, the temperature on the sides is 0.

    A perfectly insulated edge should have a heat flux of 0, so if it were saying that the heat transfer is 0 on an edge, that's the same as saying it is perfectly insulated. 

    If we were dealing with transient solutions it would be difficult (as well as being a good enough reason to revolt against your professor) but since it's a steady state solution we are dealing with it's simply looking at what the final temperature would be.  There will be heat transfer across the vertical sides in a transient solutions but at steady state it will be a simple final solution because the plate will equalize. 

    A way to think of this is to say you've got a square steel plate and you heat it up to 300 degrees.  Then you take the steel plate out and put it in a frame which is lined on the horizontal sides with bricks (perfectly insulated) and on the vertical sides with a cooling edge at 0 degrees.  What's going to happen?  It's going to start cooling the sides quickly and you'll get temperature gradients throughout the plate.  Eventually the plate will even out at 0 degrees (though it will take awhile)

    Now, think of if one side was cooled at 0 degrees and the other side was 10 degrees.  You'd end up with temperature gradients (isotherms) throughout the plate. 

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    Post #: 24
    RE: Engineers this should be challenging - 11/19/2008 12:01:24 PM   
    Camo500EFI


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    Status: offline     		Wow I actually thought your response was very interesting Tim.

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    RE: Engineers this should be challenging - 11/19/2008 2:23:57 PM   
    brute650i


    Posts: 718
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    From: Rosedale, MS
    Status: offline     		ok that makes perfect sense, mind is overloaded at the moment and I confused myself while typing that out.

    it is only B that we are talking about so the final temperature should be 0? Thats the answer that i got when doing the hand calculations with fourier
    and should it be a linear relationship between the initial temp and the final?

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    2005 white F-250 FX4 4X4

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    Post #: 26
    RE: Engineers this should be challenging - 11/19/2008 2:42:19 PM   
    Big_T


    Posts: 3089
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    Status: offline     		linear as a function of what?  x?

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    Post #: 27
    RE: Engineers this should be challenging - 11/19/2008 5:21:20 PM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		not sure? i think thats where i was going with it

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    2005 white F-250 FX4 4X4

    The Original FCP Brute Force 801
    * 28x10 mudzilla's all around
    * moose module
    * custom dual airbox snorkle
    * dynojet kit
    want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

    My Pics

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    Post #: 28
    RE: Engineers this should be challenging - 11/19/2008 6:09:43 PM   
    camogrizz51


    Posts: 3820
    Joined: 1/31/2006
    From: Louisiana
    Status: offline
    quote:

    ORIGINAL: brute650i

    Im a junior at Ole Miss but let me guess you go to LSU to


    Hoping on it, im going to southeastern right now its in hammond.  But LSU has my application for the spring 09 semester, and from what everyone is telling me i shouldnt have a problem getting in i have a 3.25 gp right now and LSU requires a 2.5, after this semseter is over my gpa should go up to a 3.5. So come January i will hopefully be a TIGER

    < Message edited by camogrizz51 -- 11/19/2008 6:11:41 PM >

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    HL Springs on all 4 shocks
    start lockout mod
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    hmf utility exhaust, k&N pro-flow kit, and dynojet kit
    Full Bayou snorkels
    warn bumper and trail lights
    more to come
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    Post #: 29
    RE: Engineers this should be challenging - 11/19/2008 6:12:12 PM   
    brute650i


    Posts: 718
    Joined: 7/21/2006
    From: Rosedale, MS
    Status: offline     		I got accepted and almost went but the out of state tuition would have murdered me so I decided for Ole Miss instead

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    2005 white F-250 FX4 4X4

    The Original FCP Brute Force 801
    * 28x10 mudzilla's all around
    * moose module
    * custom dual airbox snorkle
    * dynojet kit
    want to trade four 28*10 mudzilla's for four 29.5*10 outlaws

    My Pics

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    Post #: 30
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