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Originally Posted by bobo5195
... i want to make it water tight techincal paper level, which is probably overboard for DIYers...
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Not all of them. Seal it up.
I also think this is a 1d oversimplification. The problem is far more three dimentional, especially since I think we are trying to anticipate DIYers often foolish, unconventional, but occassionally meritorious, ideas by designing a waterblock testing setup which can handle a situation where "The expression for psi JT is derived assuming that TT-TA~TJ- TA" is totally invalid.
The whole problem affects the whole problem. It is not a direct heat path. The block design affects the apparent θjc - relationship, even without an IHS.
Example. What happens to θjc expressed as (true Tc- true Tj)/device W when genius Joe DIYer Sixpack decides that his revolutionary waterblock which has a hole drilled down the centre,
right above the Tc sensor is the ultimate cooling solution ?
There is sod all heat flux in that path. The relationship, Tc to Tj as a function of device W is lost. (Tc - Tj)/W is not constant.