# Math Help - Insulated Plate

1. ## Insulated Plate

Here.

2. 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

3. 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?

4. 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