O.K. I needed abreak anyway.
To determine which type of flow exists calculate the following:
Flow rate of the fluid in GPM - Q
Specific gravity of the fluid - G
Pipe inside diameter in inches - D
Fluid viscocity in centepoise - V
Use the following equation to determine the REYNOLDS NUMBER:
REYNOLDS NUMBER = RE = [3160 x Q x G] / [D x V]
Flow conditions with a Reynolds Number greater than 4000 is fully developed turbulent flow. A Reynolds Number less
than 2000 is laminar flow. It requires a Reynolds number greater than 4000 to maintain accuracy.
So we set up the equation to find a flow rate (Q) for a given tube to maintain turbulent flow.
We will assume our numbers are for water. Wort will be very close to this and if anything would trend to nmore turbulent flow.
G = 1 g/cm3
V = 1.0020 cP
RE = 4000
D = desired tubing
Q (gpm) = [4000 x D x V] / [3160 x G] = [4000 x D x 1.0020] / [3160 x 1]
Q (gpm) = [4008 x G] / 3160
so... for a 1/2" diameter tube
Q (gpm) = [4008 x 1/2] / 3160 = 0.634 gpm
This means in order to maintain a turbulent flow in a perferctly straight pipe with a 1/2" diamter, the water must be flowing at .634 gallons per minute. Add the turns we have in our chillers and that number drops significantly.
for 5/8" tubing Q = 0.793 gpm.
Basically, we always have turbulent flow so extra baffles are just a waste and are slowing down fluid flow.
:EDIT: I posted this up in my blog for easy reference. http://blogs.homebrewtalk.com/Boerde...in_my_chiller/