[Stoves] [Fwd: Superficial Velocities of Power gasifiers and WoodGas Stoves]

[William Carr]

On Aug 2, 2007, at 7:47 PM, Crispin Pemberton-Pigott wrote:

> But...if the flow was constant at 0.5 LPM, how could it have taken  
> longer?
> Was the flow 0.5 without no 'fuel' and less without it?  Was it  
> perhaps
> constant pressure that gave a flow of 0.5 without fuel?


I immediately thought it was probably turbulence slowing the flow as  
the gas molecules passed around the "fuel" objects.   Turbulence is  
going to steal some of the momentum of the gas and convert it into heat.


I suppose this could be tested by using different mock "fuel"  
objects, say steel ball bearings versus plastic balls of the same  
diameter.   The smoother the finish on the balls the less turbulence  
given the same diameter.