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Thread: Smoke Study

  1. #1 Smoke Study 
    Forum Freshman Josey's Avatar
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    All,

    Looking to conduct smoke study to demostrate unidirectional airflow and sweeping action over and away from a sterile work space within a horizontal laminar flow hood. I have been thinking about using dry ice to perform the test as particulate count in the clean room is a concern. The air is filtered through Hepa filters and we want to watch the patterns of air flow along the surface and objects with in the workspace.

    Anyone have experience with a test like this? Would you be willing to share some basics of how you conduct the study?


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    Forum Freshman Josey's Avatar
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    Quote Originally Posted by PhDemon View Post
    There will be small droplets of water in any fog/smoke produced from dry ice, in fact in any fog/smoke there are particles - otherwise you wouldn't see it, it is light scattering from particulates that makes smoke/fog visible.. If particulates are a concern this could be a problem...
    Thanks PHDemon. Water droplets ok and a minimum of particulate is the concern. The goal is to observe the airlow once and then periodically. Thinking I would video the flow. Dry ice still seems the way to go as the particulate and water will be sent out into the room and recirculated (captured by the rooms HEPA). I am thinking about the fog machines used for decoration or Halloween which pump out an artificial smoke/fog.... do not know right now if this uses dry ice or something else. I like the challenge though... keep 'em coming one and all.


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    Forum Freshman Josey's Avatar
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    Found the following procedure which may be helpful to some:http://www.ivtnetwork.com/sites/default/files/Smoke.pdf
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    The dry ice fog seems to flow downward and hang near the floor level. I don't know if that might affect your test.
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    Forum Freshman Josey's Avatar
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    Quote Originally Posted by Harold14370 View Post
    The dry ice fog seems to flow downward and hang near the floor level. I don't know if that might affect your test.
    Harold14370, the falling can start from above and cascade down the room and equipment. the link above was helpful. We are in fact tracking the path a particle would take if introduced into the room.... if the smoke stays clear or is pushed away from the work area this is a success.
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