[Stoves] Kinematic Viscosity measure of organic waste water question

Frank Shields frank at compostlab.com
Fri Feb 8 16:12:09 CST 2013


Thanks all for the collection of info on viscosity.
So many ways to measure, so many conversions factors and for so many uses.
Yik

And I thought it was going to be simple...

Regards

Frank




-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
ajheggie at gmail.com
Sent: Friday, February 08, 2013 1:57 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Kinematic Viscosity measure of organic waste water
question

[Default] On Thu, 7 Feb 2013 10:11:44 -0800,"Frank Shields"
<frank at compostlab.com> wrote:

>I have been asked a few time to determine the kinematic viscosity of the
remaining liquid from a methane production solution. 
>
>These are new words for me and looking at equipment there seem to be many
ways to determine viscosity and then calculators to convert to kinematic
units. 
>
> 
We've had this reply from Corey but it was accompanied by a whole digest and
a large PDF so it was too big for the list, I hope Erin will be able to find
space on the [stoves] website for the presentation pdf, AJH

 Hello all,
The creation of PAH in biochar is fairly complex. The Illinois Biochar Group
at UIUC is doing a lot of work in this area, I have been attending their
meetings/presentations for over a year now. John Scott has studied the PAH
and phenol formation under different gasification rates and temperature,
air/N2 environment, and post storage conditions. His presentation is
attached which also shows the equipment he uses, there is not a simple "PAH
meter" to answer these questions sufficiently.  Kurt Spokas is also doing a
lot of work on biochar with the USDA and running an ongoing experiment of
biochar in active plots. So far he has seen all kinds of results for
different chars and different crops: no significant difference in yield,
increased height and decreased germination in lettuce, lower grain yields,
improved poor soil but unaffected good soil, ect. He makes sure to emphasize
that biochar is highly variable and not completely understood, and that
people are trying to make conclusions about it without actually knowing what
it is or all the underlying mechanisms.
Kurt is very straightforward and scientific in his approach, I recommend
looking up some of his work to balance out the "miracle biochar" claims that
are out there. Basically we cannot say if a certain biochar will be "good"
or "bad". It would have to be created consistently in a well controlled
environment and used with a particular crop in a particular soil with a
known response to get a net positive outcome. 
Kinematic viscosity is the diffussivity of momentum. Wikipedia has some ways
to measure it.
http://en.wikipedia.org/wiki/Viscosity#Viscosity_measurement
In school we measured viscosity by dropping spheres of various material
(delrin, hdpe, steel, chrome) through a tall column of the liquid material.
With the surface friction, shape factor, and mass of sphere known, and the
descent time and distance measured, the viscosity could be calculated. 
- Corey Berman

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