Pro/Forums - View Single Post

Cathar · 08-26-2004, 06:10 PM

I suppose the followup question would naturally be this:

Can you sustain an effective h of 100K (very very difficult I might add) across a spherical surface of high surface area as opposed to a flat surface of smaller area?

As a followup consideration, flat plate blocks (Cascade included) typically engage, though surface/wall structure, two to three times the convectional surface area than a pure flat-plate model. Let's assume that the spherical model is doing the same with its available surface, how does that change the outcome once the 1-D conductional costs are factored in?

One further consideration - the thin-base flat-plate model's heat-spread pattern really isn't affected so much with changes in the size/area of the heat-die. With a thick-base spherical model, what happens as the die size approaches the size of the hemisphere and spreading resistance becomes a factor again?

Am just musing over the implications of the physical implementation, rather than the simplistic theory of it. Not intending to be negative at all - just to promote further thought.

08-26-2004, 06:10 PM	#40
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	I suppose the followup question would naturally be this: Can you sustain an effective h of 100K (very very difficult I might add) across a spherical surface of high surface area as opposed to a flat surface of smaller area? As a followup consideration, flat plate blocks (Cascade included) typically engage, though surface/wall structure, two to three times the convectional surface area than a pure flat-plate model. Let's assume that the spherical model is doing the same with its available surface, how does that change the outcome once the 1-D conductional costs are factored in? One further consideration - the thin-base flat-plate model's heat-spread pattern really isn't affected so much with changes in the size/area of the heat-die. With a thick-base spherical model, what happens as the die size approaches the size of the hemisphere and spreading resistance becomes a factor again? Am just musing over the implications of the physical implementation, rather than the simplistic theory of it. Not intending to be negative at all - just to promote further thought.