[Default] On Thu, 7 Feb 2013 10:11:44 -0800,"Frank Shields" <[email protected]> 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 _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
