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.
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