[Robotgroup] water flow
Don Colbath
dcolbath at austin.rr.com
Tue Aug 15 19:37:49 PDT 2006
So it's kind of like a pill or capsule for an oil well. Wonder if this
stuff could have other uses like mold making etc. ?
Don
Richard Abbott wrote:
>We mix the polyethylene oxide with "secret" ingredients and throw it into the extruders where it comes out as plastic tubing. It is cut to length, and we furnish end caps made of the same stuff. The user puts surfactants, and other chemicals into the tube, and throws it down a dying oil well. When the tube lands at the bottom of the well, water dissolves the tube and releases the chemicals. The chemicals make the remaining oil foam up, making it easier to suck up. I don't make this stuff up. I just report it.
> Rick
>
>Don Colbath <dcolbath at austin.rr.com> wrote:
> Water soluble plastic? Sounds interesting. What are it's uses? Do
>you pour it into a mold and let it dry out?
>
>Don
>
>Richard Abbott wrote:
>
>
>
>>If anyone is so inclined, I can get Polyethylene oxide at my work. Mike is right. At work they use it as a water soluable plastic.
>>Rick
>>
>>Def Egge wrote:
>>Of course, oil and water do not mix so well but, perhaps, that is all right.
>>
>>Polyethylene oxide dissolved in low concentrations can drastically alter
>>the viscosity of water. Glycerine, methyl cellulose, sugars, low molecular
>>weight alcohols, etc. are cheap, easily-obtained water-soluble substances
>>that might be worth experimenting with.
>>
>>Fluorescein, mentioned in an earlier post, though fairly non-tocix, is a
>>major irritant to skin, eyes, and mucus membranes. It might be wise to
>>avoid triggering allergic / asthmatic reactions among onlookers. [I seem
>>to remember that the fluorescein-containing lasers created respiratory
>>problems when they leaked in a lab I used to hang out in.]
>>
>>All the best....
>>
>>
>>Mike
>>
>>
>>
>>At 14:58 2006/08/10 -0500, you wrote:
>>
>>
>>
>>
>>>If we are talking about making water look pretty, perhaps you could add
>>>some other fluid to the water to change its properties (viscosity or
>>>whatever). Oil comes to mind as a possibility.
>>>
>>>
>>>
>>>Leslie Filip wrote:
>>>
>>>
>>>
>>>
>>>>Did you use angled blades that were in sync with the speed of flow?
>>>>If this is not taken into account then the result sucks. FYI I am
>>>>talking about blobs that are around a half inch in diameter, not
>>>>sprinkle. I think a frozen arc of blobs is magnitudes more
>>>>interesting than a single vertical stack of droplets, granted even
>>>>those are pretty cool looking with the fluorescent dye and UV LEDs.
>>>>
>>>>I keep saying this so please if someone has seen otherwise correct
>>>>me: "The start of laminar flow requires a ramp-up of speed within the
>>>>output chamber before exit." This is why trying to pulse blobs with a
>>>>plain valve does not work. It is the uniform speed and trajectory of
>>>>water molecules in laminar flow as well as surface tension that
>>>>allows the blobs to remain coherent.
>>>>
>>>>Looking forward to the party.
>>>>
>>>>Les
>>>>
>>>>
>>>>On 10 Aug 2006, at 12:47 PM, brooksdesign wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>I tried several chopping type methods but none worked as good a my
>>>>>sprayer hose valve thing in the sink .I have been messing with
>>>>>chamber with water feeding in the side ,a nozzle on top and a
>>>>>diaphram on bottom that can be pulsed by mechanical piston on a
>>>>>crankshaft of with air pressure .I discovered this while rinsing
>>>>>out a soap bottle ,good blobbieness .I'm building this as part of
>>>>>the stage show I'm planning for the .....wait for it ....The last
>>>>>party and official house dissassembly event at brooks' place in
>>>>>Bastrop (no date yet but soon).
>>>>>-brooks
>>>>>
>>>>>-----Original Message-----
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>From: Leslie Filip
>>>>>>Sent: Aug 10, 2006 7:29 AM
>>>>>>To: Austin Robotgroup Mailing List
>>>>>>Subject: Re: [Robotgroup] water flow
>>>>>>
>>>>>>If the blades are in a blower-type arrangement instead of a fan-like
>>>>>>arrangement it would chop the water more smoothly. The nozzle would
>>>>>>have to be shooting from within the cage though.
>>>>>>
>>>>>>Les
>>>>>>
>>>>>>
>>>>>>On 10 Aug 2006, at 2:53 AM, Leslie Filip wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Gray,
>>>>>>>
>>>>>>>I believe it is still laminar flow you are wanting, only that
>>>>>>>instead
>>>>>>>of constant streams you want blobs. In order to accomplish this the
>>>>>>>material has to have a ramp up of speed inside the laminar flow tube
>>>>>>>before it exits. In the examples I have seen, it was not possible to
>>>>>>>have a series of closely spaced blobs using only control valves.
>>>>>>>There may be a solution.
>>>>>>>
>>>>>>>If you have an arc of laminar flow water, I believe you could
>>>>>>>mechanically chop it into blobs, removing the water where you want
>>>>>>>space. Think of the way a jet engine's blades are tilted. As the
>>>>>>>water passed through rotating blades the entry point and exit point
>>>>>>>of the blades in the water column would coincide with the forward
>>>>>>>motion of the water arc, thus chopping it into a series of small
>>>>>>>cylinders. Then through surface tension, each cylinder would reshape
>>>>>>>itself into blobs. It is the lack of uncontrolled angular momentum
>>>>>>>that allows the blob to remain a blob.
>>>>>>>
>>>>>>>There is a limit to the speed at which the water can travel as a
>>>>>>>blob, however. When the speed goes beyond a certain point, the air
>>>>>>>pressure at the front of the blob destabilizes it. In a parabolic
>>>>>>>arc, this is as true for the speed at which the water exits the
>>>>>>>nozzle as it is for the descent.
>>>>>>>
>>>>>>>The arcs I saw in Las Vegas in some of the smaller water gardens
>>>>>>>went
>>>>>>>about 10-12 feet without a problem. The arcs are more prone to
>>>>>>>destabilization than blobs due to surface tension and the differing
>>>>>>>speed from one part of the column to another. I don't think there
>>>>>>>would be any problem at all with blobs remaining blobs over this
>>>>>>>distance.
>>>>>>>
>>>>>>>Les
>>>>>>>
>>>>>>>
>>>>>>>On 09 Aug 2006, at 5:26 PM, Gray Mack wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>What I am looking for is a term for creating liquid
>>>>>>>>blobs. How big they can be and stuff based on driping
>>>>>>>>
>>>>>>>>
>>>>>>>>from a drop tower or launched.
>>>>>>>
>>>>>>>
>>>>>>>>Another approach- Put some LED's, a microcontroller, a
>>>>>>>>capacitor, and an inductor+rectifier into a bunch of
>>>>>>>>ping pong balls. Fire them from an air blower/cannon
>>>>>>>>at synchronized intervals in an arch or straight down
>>>>>>>>or through a clear pipe and when they land they roll
>>>>>>>>to a hopper to be recycled. As they are loaded into
>>>>>>>>the cannon the capacitor is charged through the
>>>>>>>>inductor via a varying magnetic field at the cannon
>>>>>>>>and instructions on when to light up are also sent
>>>>>>>>through the field to each ball. The capacitor has
>>>>>>>>enough power to blink LEDs a few times during its
>>>>>>>>travel as directed by the cannon.
>>>>>>>>-Gray
>>>>>>>>
>>>>>>>>--- Shane Geiger wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>FYI: http://en.wikipedia.org/wiki/Laminar_flow
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>Paul Atkinson wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>Gray,
>>>>>>>>>>
>>>>>>>>>>I don't think you'll have a problem if you
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>aren't susceptible to jitter between pulses (as
>>>>>>>>>stepper motors are.)
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>You may have to have a special driver (giveio)
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>or something like that to access the parallel port
>>>>>>>>>under Win XP/NT/2k if memory serves.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>The opposite of laminar flow is turbulent flow.
>>>>>>>>>>
>>>>>>>>>>Paul
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>
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>>>>
>>>>
>>>>
>>>>
>>>--
>>>Shane Geiger
>>>IT Director
>>>National Council on Economic Education
>>>sgeiger at ncee.net | 402-438-8958 | http://www.ncee.net
>>>
>>>Leading the Campaign for Economic and Financial Literacy
>>>
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>
>
>
--
Life would be so much easier if we just had the source code.
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