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Could you create a mist using an ultrasonic/ultrasound water device 
(nebulizer?)?  I did a quick google of it and it seems to be really 
sanitary solution and a good way to visualize air flow.

Frank Kusiak
Cyberville Gallery Leader
Saint Louis Science Center
5050 Oakland Ave
St. Louis, MO 63110
Office:  1-314-286-4659
Fax:  1-314-286-4606





Willam Katzman <[log in to unmask]> 
Sent by: Informal Science Education Network 
<[log in to unmask]>
08/06/2007 07:31 AM
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Informal Science Education Network <[log in to unmask]>


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Subject
Re: Vortex Generation






ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related 
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I would also question whether you could achieve a safe warm water vapor
cloud in the summer.  It may be possible, but it's daunting on such a 
large
scale in an outdoor environment (I'm thinking that producing a 
non-scalding
steam vent that has a 15' diameter on a humid summer day is going to be
incredibly difficult).  With such a large structure, you may want to look
into producing fog using water going through fine cloud producing spray
nozzles.  The other classic ways of doing it include transducers or your
classic warm mist vaporizer (or just boiling water).  I've never used the
cloud producing spray nozzles, but they are used at theme parks and other
"large scale" entities. 

-William Katzman
Director of Exhibits
Catawba Science Center
(828) 322-8169 x307


-----Original Message-----
From: Michael Driver [mailto:[log in to unmask]] 
Sent: Friday, August 03, 2007 9:34 AM
Subject: Vortex Generation

ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related
institutions.
****************************************************************************
*

The Children's Museum of Pittsburgh, PA, wishes to construct a cloud
vortex into which the children can walk.  The parameters are shown
below.  They are looking for help in answering the questions. 

 

WARM WATER VAPER CLOUD

Objective: 

*        To generate a visible warm water vapor cloud.

*        The cloud must be of a low enough temperature that a person
could stand in it.

*        The objective of the cloud is to create a raising column of
mist within a tall (about 30') glass sculpture structure.

*        The shape of the glass sculpture will generate a vortex cloud.

*        The system wants to be as passive as possible.

*        The system wants to be as low maintenance as possible.

Site parameters:

*        Park near Children's Museum of Pittsburgh PA 

*        Weather                                   Ambient Temp. 0 F to
90 F degrees 

                                                            Humidity 10%
to 95%

*        A shallow concrete heated vessel below a grating.

Both about 15' in diameter.

The concrete would be heated to the temperature needed to create the
cloud and prevent it from freezing in the winter.

*        Steam Condensate lines are available near by.

                                                            Pressure
7 to 13 PSI

                                                            Temp
140F to 160F

                                                            Size
6"

                                                            Depth
3' to 6'

Questions: 

*        What are the parameters needed to generate the warm water vapor
cloud.

*        What temperature should the concrete be heated to?

*        What should the depth of hot water be?

*        What might the evaporation rate be?  (For flow rate of Steam
Condensate)

*        What distance above the hot water should the grating be in
order to have a safe temperature for the grating (bare feet) or a person
standing in the cloud?

*        Should there be make up air brought in below the grating? How
big?

 

 

Michael C. Driver PhD

Director of Information Services

Materials Research Society

724 779 3004 x401

 


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