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Post by rockpickerforever on Jan 20, 2020 17:51:49 GMT -5
Those look really cool, jamesp ! That last picture looks like blood cells as seen through a microscope. Curious what a blood pathologist would think. Anemia, Leukemia, a new sickle cell anemia ? i have about 150 pounds of that not-so-pretty background pink glass. Trying to find a use for it. Christmas and Valentine colors for sure. Agree with the red blood cells, although those are pretty sickly looking. Actually, the reactive (black outlined spots) look like some kind of bacteria growing in a petri dish.
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jamesp
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Post by jamesp on Jan 21, 2020 5:08:33 GMT -5
Curious what a blood pathologist would think. Anemia, Leukemia, a new sickle cell anemia ? i have about 150 pounds of that not-so-pretty background pink glass. Trying to find a use for it. Christmas and Valentine colors for sure. Agree with the red blood cells, although those are pretty sickly looking. Actually, the reactive (black outlined spots) look like some kind of bacteria growing in a petri dish. Fusing glass plates may have many layers of color within their 3 mm thickness. They are usually different tones of the same color but not always. These layers can be striking on a microscopic level Jean. It would seem that they mixed the glass thoroughly before forming it into plates. Or different colors settle from dense to less dense within the 3 mm thickness. Even after the glass flows from a pot, thru a small hole, and fills a brick mold the layers stay in tact. Never have seen a liquid after being poured that resists color layer mixing like glass. Darker red glass often has super thin blackish layers in it. The blackish patterns internal in the red dots are the black layers described.
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jamesp
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Post by jamesp on Jan 21, 2020 5:45:35 GMT -5
Maybe I can explain how glass has a resistance to mixing like no other liquid. Very bizarre. Glass has a strange habit of not color layer mixing when poured thru a small hole rockpickerforever. Maybe I can give an example: Here is 28 plates about 5x8 inches in size. Note that the grey plate is #24 from the bottom. Here they are in the same color sequence stacked in a melting pot with a 1.5 inch hole in the bottom and ready to sit on and pour into a brick mold. The grey plate is #4 from the top. Here is a cross section of the brick after 28 plates are poured thru the 1.5 inch hole and into a brick mold. Note gray glass is in center of slab. It was plate #24 in the stack above. Slab was sawn about 2 inches in from end of brick. So all 24 plates up to and including the grey plate are inside of each other in same color sequence. As if 24 balloons were blown up all inside of each other. So 3 inches of layered glass went thru a small hole and came out inverted inside of each other in the form of a brick without mixing. The squiggly lines must be some form of compression on the layers causing them to buckle ? Not sure why that happens.
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jamesp
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Post by jamesp on Jan 21, 2020 6:03:14 GMT -5
The above example of how glass resists mixing was described to the art glass bunch on Facebook. They seemed to be in awe. They were surprised the glass stayed layered after so much manipulation. One lady said "that is laminar flow". She being an engineer. She got it. Liquids either flow in a turbulent fashion or a layered(laminar) fashion.
They do pot melts, sort of a 'hail Mary' deal. Throw scraps in the bowl and let it go where it wants. Very few if any out of 22,000 members have ever traced the flow of the glass from pot - thru hole - to brick(or slab). Only weird James ?
"Laminar flow is when every particle of fluid flows along one smooth path. The particles of the fluid do not interfere with one another, they don’t mix or shift between layers. Turbulent flow is when the flow of a fluid is irregular. Particles in turbulent flow can move back and forth between layers, mixing and falling into whirlpool-like patterns of flow."
By the way, laminar flow rarely stays laminar unless it is traveling down a straight path. For flow to maintain layered flow thru a divergence like a thin spot in a pipe is unacceptable in theory he he. So molten glass defies.
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jamesp
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Post by jamesp on Jan 21, 2020 6:14:41 GMT -5
Having known about glass exhibiting almost perfect laminar flow in many conditions has helped create the crazy patterns. This is Jane, an experienced glass artist. The lady engineer (and much better engineer than myself) that was surprised by the extreme laminar flow in glass. She lives in Dallas Texas. Her son lives about 10 miles from me. She wants to visit(my lab as she calls it) me next time she visits her son. Sounds like she is going to do some controlled glass mix projects herself. The glass blowers understand this concept all to well because they are masters at stretching glass and knowing that it maintains it's color without mixing. Meet Jane ! (I stalked her on Facebook - found out both her and husband both have doctorates in engineering). I profiled her as well educated. No one knows what laminar flow is !!
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jamesp
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Post by jamesp on Jan 21, 2020 6:50:41 GMT -5
Matt Janke is a fine man. he really helps out with troubled kids and community activities. I wish I could be as giving as he. And he likely wishes for some of your talents. Good for you to have a quality friend like that. It was just plain fortuhnicity that I ran across Matt knave. I'll go downtown and sit watching him and his 2 helpers making vases and lamp shades for hours. Glass blowing is non-stop and physical. Not many windows for a rest break. It can be dead cold outside and the heat from his shop radiates 15 feet out side his doors.
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Post by knave on Jan 21, 2020 7:49:06 GMT -5
Turbulent flow is required for good heat exchange. (Boilers, geothermal loops, radiators, etc) With brine mixes or water, this is directly related to velocity (fpm). Pumped too slowly, it will go right through an elbow in a laminar fashion. The glass is fascinating. I picture being heated from the bottom and each plate “oozes” down through the hole in turn.
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Post by knave on Jan 21, 2020 7:53:08 GMT -5
Have never seen glass blowers. Is there still a demand to support the labor intensive craft? Sounds fascinating.
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jamesp
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Post by jamesp on Jan 21, 2020 8:45:53 GMT -5
Turbulent flow is required for good heat exchange. (Boilers, geothermal loops, radiators, etc) With brine mixes or water, this is directly related to velocity (fpm). Pumped too slowly, it will go right through an elbow in a laminar fashion. The glass is fascinating. I picture being heated from the bottom and each plate “oozes” down through the hole in turn. Ah, HVAC heat exchangers are all about turbulent and laminar flow. You guys probably got reamed with that subject in school and in real world. Brine probably needs some amount of mixing so turbulent is needed I suppose. An elbow can be laminar, interesting. The behavior of the glass is insanely laminar but it probably takes 3 to 6 hours to pass thru the hole and fill the mold so that is some serious slow movement. In this case pulling a 4"x 5" x 8" block of layered glass thru a 1.5" hole and then filling an 11" x 6" x 2" brick yet keeping it's layer integrity. Impossible ! By the way different colors have different viscosities that alter patterns a lot.
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jamesp
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Post by jamesp on Jan 21, 2020 8:59:58 GMT -5
Have never seen glass blowers. Is there still a demand to support the labor intensive craft? Sounds fascinating. Most of them are making money doing glass blowing 'date night parties' and teaching events. All seem to like the night scene. Or contracting with businesses doing pendant lighting shades, sculptures, custom vases. There are 4 in Atlanta. Three give me their scraps. Glass artists don't want them because they do not polish well when re-melted so perfect for tumbling. Let me find a photo of scraps melted into blobs. Here, this is not scrap, these are 3 globes I had the blower make for me so I could break it, melt blob it, and tumble it. Same as scraps basically. www.flickr.com/photos/67205364@N06/sets/72157692358179160
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Post by knave on Jan 21, 2020 9:03:39 GMT -5
AMAZING!
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Post by 1dave on Jan 21, 2020 13:32:21 GMT -5
Have you tried two and three hole pours?
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Post by knave on Jan 21, 2020 13:34:19 GMT -5
Have you tried two and three hole pours?
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agatemaggot
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Post by agatemaggot on Jan 21, 2020 15:42:01 GMT -5
Great idea (maybe) , drilling the holes at an angle on an index head in a clockwise pattern might give a spiral , barber pole effect to the brick and the drilling could be done in any machine shop with an index set up .
Just a thought !
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jamesp
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Post by jamesp on Jan 21, 2020 18:42:41 GMT -5
1dave agatemaggotBiggest enemy to avoid is the deadly doo doo colored brown glass. Oh yes, multiple hole pot melts and diverters of all types are a great idea as long as you don't over mix the colors. It took a lot of trail and error to get the right size single hole and the optimum pot height to avoid turbulent mixing in the present set up. Especially the pot height. If the pot is raised only 1 inch from where it is now set 50% of the brick turns brownish from a dozen colors over mixing. I have seen a rod setup where they can pour the glass over rods making exceptional patterns. This is a many holed pot melt onto a flat surface called a plate pour. Plate pours are less likely to turn brown as compared to brick casting because there is less mixing in a plate pour. Note back section is pouring overly mixed brown glass with only 3 colors. I'd call that a goof up. The rest is beautiful. The main problem is because the pour height is too high causing good patterns in front and over mixing in back. And the glass is way too hot and viscosity is low, glass too watery. Yellow or red or yellow+red did fine up front. But in the back - yellow+red+orange made brown.
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jamesp
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Post by jamesp on Jan 21, 2020 18:59:03 GMT -5
This fellow avoided brown except in a small area. Looks like only a 2 color melt making things easier to avoid brown. Really the key is to maintain layered flow. knave knew what layered flow is and why it happens because he is an HVAC master. Most glass workers don't get the concept of layered flow because it is strange or extraordinary.
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jamesp
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Post by jamesp on Jan 21, 2020 19:02:05 GMT -5
Found the out come of the first multi-hole melt. very nice:
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jamesp
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Post by jamesp on Jan 21, 2020 19:04:40 GMT -5
Few people pour into a brick mold because they are not interested in bricks requiring lapidary processing. Most pour plates like the 2 plates above.
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Post by knave on Jan 21, 2020 19:11:56 GMT -5
Laminar flow with four holes would produce some interesting hourglass shapes where the circles meet
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Post by knave on Jan 21, 2020 19:15:19 GMT -5
jamesp What would you recommend for 120v electric kiln?
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