air permeable material against a wet environment

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v1sor Power-User Join Date: Nov 2007 Location: Near DC, USA Posts: 128 Good Answers: 15	air permeable material against a wet environment 03/07/2008 11:36 AM
	I am considering a material which would have a wet (water) side and a "dry" (atmospheric air) side. The dry side would possibly be higher pressure, but in any case the air is allowed to transit through the material to form bubbles on the surface of the material on the wet side. The water wouldl be largely excluded from transmission, although not necessarily exclusively so. Aerogells come to mind, or some kind of semi-permeable membrane perhaps. It wouldl convenient for the air bubbles to be very small and numerous and tend to adhere to the material in the face of flow across the wetted side. While i am not a materials scientist I have researched this and discussed it with some who are, but none were really helpful. It is my hope that you will be able to identify issues and considerations (or even materials ) I have not found. Even something that is close would be helpful. I am sorry that I cannot discuss the application. Thanks for your time and consideration. r/ Sam Hicks __________________ “Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities. Truth isn't.” – Samuel Clemens in Following the Equator, Pudd'nhead Wilson's New Calendar
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Ace Boeringa Guru Join Date: Mar 2006 Location: Washington USA Posts: 566 Good Answers: 53	#1 Re: air permeable material against a wet environment 03/07/2008 11:54 AM
	A material to consider could be GoreTex.
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v1sor Power-User Join Date: Nov 2007 Location: Near DC, USA Posts: 128 Good Answers: 15	#2 In reply to #1 Re: air permeable material against a wet environment 03/07/2008 12:48 PM
	Thank you. I will check goretex. BTW: I never made it to the moon. though tit wold be nice trip. Read somewhere that larger telescopes cna picture some of the detritus of the Apollo program. I have never seen it. __________________ “Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities. Truth isn't.” – Samuel Clemens in Following the Equator, Pudd'nhead Wilson's New Calendar
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Munky Power-User Join Date: Feb 2006 Location: Richmond Hill, Ontario (North Greater Toronto Area), Canada Posts: 240 Good Answers: 5	#3 Re: air permeable material against a wet environment 03/08/2008 6:11 AM
	I'll guess you're making an air filtration system. __________________ You can have it good, fast or cheap. Pick two.
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welderman Guru Join Date: Sep 2007 Posts: 1601 Good Answers: 58	#4 Re: air permeable material against a wet environment 03/08/2008 10:50 AM
	If I understand your question, you can use a non-permeable membrane, possibly a metal foil. This will keep the moisture transmission to zero. By cooling the wet side to below the dew point of the gas, you will coat the wet side with a layer of small droplets or frost, depending on the dew point of the gas on the wet side.
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senator46 Active Contributor Join Date: Aug 2007 Posts: 21 Good Answers: 1	#5 Re: air permeable material against a wet environment 03/09/2008 5:38 PM
	expanded PTFE membrane materials are commonly used for such applications. the biggest manufacturer of these is W.L.Gore...their product is called Goretex. These materials have a pore size that will allow gas to pass through but will not allow liquid water to pass through.
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Ace Boeringa (1); Munky (1); senator46 (1); v1sor (1); welderman (1)

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