On Mon, Oct 20, 2003 at 11:45:26PM +0200, Per wrote: > Jeg har prøvet metoden som Heikki anbefalede. Den virker. Jeg satte en 19l > gryde i et fyldt babybadekar og lagde en meget lansomt løbende vandslange > ved siden af så vandet cirkulerede på 3 sider. Efter 20 min kunne jeg hælde > på gærtank.
It is amazing how badly water conducts heat. In a stationary tub, the water next to the hot pot can be really warm, and just a few cm away it is freezing cold. Once there is a way to move the hot water away from the pot (and get some cold water to take its place), the cooling efficiency gets so much better. I guess a similar effect happens in a counter-flow cooler, when you narrow the outer tube so much as to get a turbulent flow instead of a laminar one, mostly for the same reasons. Sounds like such a simple subject, cooling a liquid. Yet there is *so* much to learn about it. I'm sure learned treatises have been written on the matter... -H -- Heikki Levanto LSD - Levanto Software Development <[EMAIL PROTECTED]>
