h a l f b a k e r y"My only concern is that it wouldn't work, which I see as a problem."
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nubbly flow catalysts
catalysts spheres could be aerodynamically shaped to have wobbly turbulent flow rather than laminar plus turbulent like spheres do | |
I saw a picture of some surface active material at a tech magazine it occured to me that at various rates of fluid flow liquid or gas that spheres have laminar flow on the side plus turbulent flow at the back what if just a "third" of the surface of a catalytic sphere is superactivated from nonlaminar
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changing the shape of the catalysts to have turbulent flow would give them more function per amount of time
the engineer could specify catalyst shape to go with process fluid travel rate to optimize the reaction
Diamagnetic catalyst with bismuth has tunable surface monoatomic layer
http://www.youtube....watch?v=Q9cFOqIDgqc
[beanangel, Oct 12 2009]
[link]
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//changing the shape of the catalysts to have turbulent flow would give them more function per amount of time // |
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well if you drove a sphere on a road the air would flow smoothly on the sides with a bunch of turbulence at the back |
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if you drove a >o< on a road then there would be lots of swirly airflow |
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swirly flow near the surface of a catalyst makes reactions happen more rapidly or more fully which is of benefit |
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when I've seen pictures of catalysts sometimes they are round |
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I suggest engineers make the shape go with the fluid movements they are at |
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Depending on the size of the catalyst, and the involved fluid velocities, turbulence will sometimes be unachievable. |
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With a sphere, the resultant packing is much easier to forecast than with some kind of spiky object, making it easier to foretell the flow capacity of the catalyst-packed tube |
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[marked-for-deletion] widely known to exist (amongst chemical engineers). You think we just stick with spheres? You don't think we include non-spherical shape factors into our dimensionless naiver-stokes equations? Just because you can't or didn't find something on the |
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Manipulating catalytic reactions in the turbulent regime is the subject of entire classes at the graduate level. |
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daseva, you and your naiver-stoking ilk are fortunate to have beanangel weighing in with some advice. Experts often benefit from advice about their field because they become hidebound and crotchety. Yes, you read me right. Crotchety. |
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But I am curious about why turbulent flow is better at catalyzing reactions. Imagine that the reaction is my inkstamping the foreheads of patrons as they enter my hopping new nightclub. Laminar flow would maximize the number who pass me, get stamped, then enter the club. Turbulent flow would entail the patrons milling about in front of my throne, with many presenting for a stamp who had already been stamped. |
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The point of catalyst carriers - often a ceramic substrate - is to maximise the contact surface area for the reactants. Since a sphere is the solid form with the smallest surface area for its volume, it's not an idea shape. |
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Transit time through the catalyst bed and thorough mixing are essential; it also depends if the catalyst is promoting a combination of components, or the splitting of a single component into daughter products, as performed by catalytic crackers in petroleum refining. |
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My point is that you gotta do more than ask for non-spherical objects to break out of our catalytic box. |
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Laminar flow creates what is known as a "boundary layer" This is akin to a bunch of chatty folk in front of the stamping booth standing while the people behind them slip through smoothly without ever getting stamped. Turbulence disrupts this layer, leading to steeper velocity profiles and faster exchange of energy. So, even though some of your patrons have already been stamped, you aren't letting as many get by without stamps at all. |
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Turbulent effects cannot be modeled based on first principles, but rather there is an extensive amount of empirical data that give mass and momentum transfer profiles in the turbulent regime for practically any shape under any fluid velocity and at any viscosity. We like baffles and plates and all sorts of fun little shapes and we've been doing it long before beany came up with this nauseating anticrotchetry. |
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whose intellectual toes hasn't he stepped on? Yes catalysis can be improved by changing the surface properties of the catalytic medium. Yes this is already applied. Are all catalytic media round? No. Are all catalytic media nubbly? No. Is this intentional? Yes. Does BA's tissue thin (I just read this 25 seconds ago) surface understanding allow for more nuance? unlikely. |
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I appreciate that people are commenting |
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I made a video about a different thing which is using catalysts with diamagnetic bismuth cores plus a magnetic field to create custom motionable catalysts
kind of like you could use a vibration frequency to optimize rate of catalysis To view the video turn the volume up |
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Now I think diamagnetism is a monotomic effect that works at a variety of states of matter thus even though water is liquid you can wiggle it with magnetism |
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thus wiggling bismuth core catalyst particles benefits catalysis |
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regarding your anno: huh? |
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regarding your posted video(s): Hilarious. Posting a 'video' about a prize that consists of an overlay full of [beanangel] talk, some ultra-low audio and a background of dancing girls... i wonder why you never posted this style as an idea... |
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