Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: ostchina on 27/09/2011 04:06:22

Title: Why do no one discuss thermal problems?
Post by: ostchina on 27/09/2011 04:06:22

Hi~
Recent I study heat transfer and want to discuss it.
My turn:

Heat transfer processes are classified into three types.

The first is conduction, which is defined as transfer of heat occurring through intervening matter without bulk motion of the matter.

 The second heat transfer process is convection, or heat transfer due to a flowing fluid.  The fluid can be a gas or a liquid; both have applications in aerospace technology.  In convection heat transfer, the heat is moved through bulk transfer of a non-uniform temperature fluid.

The third process is radiation or transmission of energy through space without the necessary presence of matter.  Radiation is the only method for heat transfer in space.  Radiation can be important even in situations in which there is an intervening medium; a familiar example is the heat transfer from a glowing piece of metal or from a fire.

Title: Why do no one discuss thermal problems?
Post by: ostchina on 27/09/2011 04:07:49

I measured a lot of relevant data and Upload later

Title: Why do no one discuss thermal problems?
Post by: Soul Surfer on 27/09/2011 09:01:29

I appreciate your preferred language is not english.  Many people here understand the basic principles of heat transfer.  Please tell us what is the problem?  There are many ways of cooling objects that are generating an excess of heat.  Some of these may not be obvious to a person new to the field.  Which method is best depends on precisely what you are trying to do.

Title: Why do no one discuss thermal problems?
Post by: ostchina on 28/09/2011 03:01:41

Thank you.
In fact, my problem is about how to measure thermophysical properties of Material.
As you said my preferred language is not english, I found there are some difficulties to descript the problem clearly. So I am considering how to descript.
I was the first time to ask questions here. Thank you for your attention.

Title: Why do no one discuss thermal problems?
Post by: Soul Surfer on 28/09/2011 08:30:50

There are many articles available by searching the web on basic measurements and most traditional school textbooks give pictures of simple apparatus that could be used at home.  Because heat transfer coefficients vary so greatly the method used must match the range of values expected from good thermal conductors to insulating material.  A full description is not practical in these simple question and answer pages.  can you please be much more specific about what you wish to do and broadly why you need to measure it.