# Insulated Plate

• Mar 16th 2007, 11:19 AM
ThePerfectHacker
Insulated Plate
Here.
• Mar 16th 2007, 12:48 PM
CaptainBlack
Quote:

Originally Posted by ThePerfectHacker
Here.

The heat flow in direction a (a unit vector) is proportional to (grad u).a. At a
perfectly insulated boundary there is no heat flow accross the boundary, so
if a is a unit normal to the boundary (grad u).a = 0.

Now if you apply this to the case in hand you should get the result quoted.

RonL
• Mar 16th 2007, 01:21 PM
ThePerfectHacker
Quote:

Originally Posted by CaptainBlack
The heat flow in direction a (a unit vector) is proportional to (grad u).a. At a
perfectly insulated boundary there is no heat flow accross the boundary, so
if a is a unit normal to the boundary (grad u).a = 0.

Now if you apply this to the case in hand you should get the result quoted.

RonL

Thus, it means that there is no heat flow?
• Mar 16th 2007, 01:26 PM
CaptainBlack
Quote:

Originally Posted by ThePerfectHacker
Thus, it means that there is no heat flow?

Exactly, you would think that they would just say so wouldn't you?

RonL