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Date: Sun, 7 May 2006 07:41:05 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: oil cooler lines
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On Sun, 7 May 2006 01:42:05 EDT
Lehanover@aol.com wrote:

>  
> In a message dated 5/6/2006 10:37:55 P.M. Eastern Daylight Time,  
> lendich@optusnet.com.au writes:
> 
> Bill,
> There must be there a way of balancing/  equalizing the pressures and flow 
> through
> parallel radiators with the use of regulators or  some such auto or pre-set 
> resistors or balance tubes etc.
> George (down  under)
> 
> 
> 
> Unless there is a built in flow path problem, the loss of heat raises the  
> viscosity of the fluid and slows its flow rate, then the resistance goes up and  
> the other cooler flows better for a while, and the outcome is reversed. No 
> other  equipment is required.
>  
> Lynn E. Hanover
> 

I did some measurements of flow rate with two different viscosity's of
fluids with an EWP.  Counter intuitive as it may seem, I found no
difference in flow rate between viscosity's of 1.3 cp and 5.3 cp.

The details are at http://tinyurl.com/4cj4w
(I'm having some technical problems with the rotarywiki.org at the
moment, so if this link doesn't work, try again a little later.)

It's possible that the EWP reacts to the higher viscosity by slowing
down exactly the right amount to keep flow constant, but as I was
totally surprised by the result, I think I would want to see a test
with the engine driven pump before assuming the viscosity change would
help balance the flow.

Bob W.

-- 
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