Here.

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- March 16th 2007, 11:19 AMThePerfectHackerInsulated Plate
Here.

- March 16th 2007, 12:48 PMCaptainBlack
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 - March 16th 2007, 01:21 PMThePerfectHacker
- March 16th 2007, 01:26 PMCaptainBlack