Date: Sun Oct 25 08:34:50 2009 ** **Back to Contents ** ------------------------------------------------------------------------ **

Author: Urs Lauterburg

Subject: Re: Fog Machines



Thanks for taking up the thread again. Producing laminar airflow is
actual an art in itself. It took us a long time to create our very
own air blowers for our aerodynamics student labs. After modeling a
shape/fan combination and refining it by actual trail and error we
are now able to produce a sufficiently laminar airstream across a
square area of about 15x10cm.

The recent tap-l subjects made me think about the fogger/bladeless
fan combination. I fancied that type of fan to really be capable to
shape a beam like laminar airflow column which might become visible
if the fog is properly injected into the stream from behind the
bladeless fan. However, by the prize of that bladeless fan this might
turn out to be a rather expensive venture.

Anyway it could be a neatly challenging project to construct a low
budget laminar flow fogger for demonstrations of aerodynamical
processes. The SF Exploratorium has possibly already made some
researching on such a machine though.

Regards from here in the Switzer of Land


Urs Lauterburg
Physics demonstrator
Physikalisches Institut
University of Bern

>Hi Urs,
>I've tried to illustrate the path of the blower air around a beach
>ball using fog. The problem in using the fogger, at least mine, is
>that it's tough to regulate the fog from the device so you quickly
>get too much and it blocks the effect you are trying to illustrate,
>instead of illuminating it.
>But I think this problem could and should be rectified if you where
>to make a pvc pipe, with holes placed strategically on it, plumbing
>contraption attached to the fogger output which you could place in
>the right location, giving you individual fog streams. I need to
>try that........anyone else try this?
>Happy fogging from here in the US of A!
>Urs Lauterburg wrote:
>>Hey Dave,
>>Maybe the combination of a fogger and a bladeless fan opens a
>>possibility for some interesting aerodynamics dynamics stuff. Maybe
>>it's possible to make a continuos fog beam which could flow around
>>differently shaped objects.
>>Has anybody tried this out yet?
>>Urs Lauterburg
>>Physics demonstrator
>>Physikalisches Institut
>>University of Bern
>>>Hi Tappers,
>>>Just a reminder to everyone that now is the time to look for and
>>>purchase fog machines. It seems, with the growth of Halloween and
>>>Halloween parties, they are available at more places now than ever
>>>I know that Guitar Centers are selling a 400 watt fogger for less
>>>than $20, though I can't vouch for quality. I think this price is
>>>not available on line from them.
>>>But Drug and General stores frequently have them now, too.
>>>Perhaps even Walmart(?).
>>>Happy fogging,

From Sun Oct 25 08:34:50 2009