The use of classical Boundaty Layer Theory in this discussion is inapropriate, in my opinion. That theory is based on flow over surfaces that are realtively long in the direction of the air flow, (i.e flat plates, air foils, pipes, etc.) and have reltively moderate pressure gradients in the direction of flow.
That"s not the case in steel mesh found in typical oil bath air cleaners. The flow in these devices is a wake flow, is more analogous to a series of flat platse at 90o to the flow. There is hardly any length available to develop a classical boundary layer and the flow is unsteady, highly turbulent and three dimmensional. Italso happens to be a three phase flowfield with gaseous air and liquid oil and solid particles. Nothing short of a full 3-D, time dependent Navier Stokes analysis will define the discrete flow field. These devices depend on the particle inertia, mesh and housing geometry, and oil viscosity to work. Without some serious test data, I personally don"t understand how the author can claim they are ineffective. I think the biggest problem with oil bath air cleaners is that are such a mess to clean if they are not properly maintained and messy to clean and that"s why they were replaced by paper element filters. It"s analagous to why the canister type oil filters went the way of the dodo bird. they were plain messy to change. Of course not all spin on filters were oriented to not be a mess to change!
Opinions are like belly buttons;everybody"s got one. This is mine on this subject.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
... [Read Article]
Latest Ad:
one 8n and one 9n tractor. totaly restored,pretty much everything is new. one 6ft blade good shape.
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
