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bobo5195 · 05-12-2007, 08:22 AM

Ah science words all over the place.

Remember to add fillets on those corners to make em rounded (hard to machine otherwise). You can have stuff made down a local machine shop normally and they should take autocad files. Expect to pay quite alot an hour for their time.

I have graphs of roughness somewhere from a russian textbook but they use nusselt numbers like good scientists so need some translating (nuysselt number is the non dimensional heat transfer coefficant taking into account the fluid supposedly though i was never meant it meant anything )

What matters mostly is the base doesn't have macro roughness i.e. bits sticking out. A standard machine finish should be fine.

Base thickness is a bit of an art although you can make a good punt using other peoples models. Too thin can be worse than too thick as you won't cool the die evenly. I would need some maths / emperical evidence to satisfy me that highly localised cooling like unconstrained (not like the storm blocks) jet impingment likes a thinner base.

05-12-2007, 08:22 AM	#10
bobo5195 Cooling Savant Join Date: Aug 2005 Location: uk Posts: 400	Re: 1st post...want to know more of this Ah science words all over the place. Remember to add fillets on those corners to make em rounded (hard to machine otherwise). You can have stuff made down a local machine shop normally and they should take autocad files. Expect to pay quite alot an hour for their time. I have graphs of roughness somewhere from a russian textbook but they use nusselt numbers like good scientists so need some translating (nuysselt number is the non dimensional heat transfer coefficant taking into account the fluid supposedly though i was never meant it meant anything ) What matters mostly is the base doesn't have macro roughness i.e. bits sticking out. A standard machine finish should be fine. Base thickness is a bit of an art although you can make a good punt using other peoples models. Too thin can be worse than too thick as you won't cool the die evenly. I would need some maths / emperical evidence to satisfy me that highly localised cooling like unconstrained (not like the storm blocks) jet impingment likes a thinner base.