Register | Sign In


Understanding through Discussion


EvC Forum active members: 65 (9162 total)
5 online now:
Newest Member: popoi
Post Volume: Total: 915,817 Year: 3,074/9,624 Month: 919/1,588 Week: 102/223 Day: 13/17 Hour: 0/1


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   Mechanics of Interstellar heat diffusivity
TrueCreation
Inactive Member


Message 1 of 6 (23018)
11-17-2002 6:41 PM


--For those of you who have been in the forum for an extended period of time might know that I've been working on a project for Solar Cosmogenesis by means of stellar collision which may also included analysis of geochemical & isotopic functions predicted by my modified version of Buffon's theory. My dilemma is that I realize that there is a heat problem associated with condensing and accreting matter as well as maintaining a stable orbit. I need to get my hands on some materials which explain the physics and mechanics for heat diffusivity in interstellar space. I'm afraid I don't understand exactly how heat diffuses from bodies and leaks into space such as the earth. The sun I believe transports its heat by radiation so I'm not sure how that would apply. Any help would be appreciated here.
-------------------

  
Mike Holland
Member (Idle past 483 days)
Posts: 179
From: Sydney, NSW,Auistralia
Joined: 08-30-2002


Message 2 of 6 (23046)
11-18-2002 12:43 AM


TC, I don't know anything about the interstellar space bit, but isn't the heat diffusion process the one used by Lord Kelvin over a hundred years ago to calculate the age and future heat death of the Earth and Sun?
But I guess you want something a bit more sophisticated - preferably a computer program.
Mike.

  
joz
Inactive Member


Message 3 of 6 (23055)
11-18-2002 1:50 AM


OK TC lets see if I can`t help you out here....
How can heat move from one place to another?
1)Conduction.
2)Convection.
3)Radiation.
Since 1) and 2) require matter they are hardly likely to fit the bill for near vacuum which leaves us with radiation...
So we look in our handy dandy astrophysics textbook (in this case Modern Astrophysics by Carroll and Ostlie - the one I recomended to you a while back) and look up the Stefan-Boltzmann equation (derived by Ludwig Boltzmann from thermodynamics and Maxwell`s work on radiation pressure) which is....
L = 4.pi.r2.sigma.T4
where sigma = 5.67 times 10-8 [W.m-2.K-4]
Now this is only an approximation assuming the body in question is a black body but its probably close enough for what you want....
Told you you should have bought that book .....

Replies to this message:
 Message 4 by TrueCreation, posted 11-22-2002 8:41 PM joz has replied

  
TrueCreation
Inactive Member


Message 4 of 6 (23824)
11-22-2002 8:41 PM
Reply to: Message 3 by joz
11-18-2002 1:50 AM


Thanks Joz, I'm going to see if I can't get a hold of that book, via a local university library. I am aware of the methods of heat transfer and how they work, as well as the Stefan-Boltzmann equation. I'm just looking for more of a specific delve. The textbook may help me out. You wouldn't happen to be aware exactly how the problem was deduced as a heat problem associated with condensing and accreting matter as well as maintaining a stable orbit? Maybe it is somewhat considered in the book you've cited?
-------------------

This message is a reply to:
 Message 3 by joz, posted 11-18-2002 1:50 AM joz has replied

Replies to this message:
 Message 6 by joz, posted 11-24-2002 1:04 AM TrueCreation has not replied

  
joz
Inactive Member


Message 5 of 6 (24001)
11-24-2002 12:49 AM


I`m sorry bud but everything you have said so far sounds incoherrant to me, maybe if you take the time to explain what you are trying to do and what processes you need to describe I can help...
This time around try to use small words correctly used, if I was able to make out what you were asking I would be of far more help....
Also if you don`t know a single word that will suffice, use several real ones rather than making one up.....
[This message has been edited by joz, 11-24-2002]

  
joz
Inactive Member


Message 6 of 6 (24002)
11-24-2002 1:04 AM
Reply to: Message 4 by TrueCreation
11-22-2002 8:41 PM


quote:
Originally posted by TrueCreation:
Thanks Joz, I'm going to see if I can't get a hold of that book, via a local university library.
I`m pretty sure that text books are a whole lot pricier over here, I bought my copy in England for 29 pounds sterling new, the same edition is selling for 132 (US$) new on amazon at the moment although there are used copies for less (around $90)....
Also it appears that Carol and Ostlie also wrote another text called Modern stellar astrophysics, I haven`t seen this one yet so I can`t give an opinion but if your interest is more on stellar formation and physics rather than astrophysics in general maybe you should take a look at it?
Also if there is a University nearby I suggest looking through the books in question before purchasing.....

This message is a reply to:
 Message 4 by TrueCreation, posted 11-22-2002 8:41 PM TrueCreation has not replied

  
Newer Topic | Older Topic
Jump to:


Copyright 2001-2023 by EvC Forum, All Rights Reserved

™ Version 4.2
Innovative software from Qwixotic © 2024