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Drag forces exerted upon a sphere in a rotating fluid
[url=https://www.researchgate.net/figure/Viscosity-as-a-function-of-shear-rate-for-PEG-solutions-The ...
22-7-2021 at 19:41
by: Twospoons
Drag forces exerted upon a sphere in a rotating fluid
Are you assuming a Newtonian fluid? It may not be ...
22-7-2021 at 17:02
by: Twospoons
Reversing Lead Sulphation on Battery Plates
[rquote=663166&tid=71096&author=Fulmen] Most electronics is ±5% so that's of little use. [/ ...
22-7-2021 at 12:59
by: Twospoons
Need some help on how to calculate the surface area of expanded mesh.
Might be best to measure a sample.
Starting with flat plate as a reference, and a piece of mesh to ...
19-7-2021 at 14:27
by: Twospoons
Passivate Copper for High Temperature Resistance
Because copper has a high conductivity it will need to be much thinner or much longer than the equiv ...
13-7-2021 at 17:25
by: Twospoons
DIY Low Temperature Refractory Plaster/Cement?
Why are you so worried about aluminium? You know its everywhere - in rocks and soil, in most glazes, ...
13-7-2021 at 15:42
by: Twospoons
DIY Low Temperature Refractory Plaster/Cement?
[rquote=662817&tid=157699&author=VeritasC&E]Does anyone know if I can put two dimmers in ...
13-7-2021 at 14:08
by: Twospoons
DIY Low Temperature Refractory Plaster/Cement?
I'd start by looking at either phosphate bonded or silicate bonded systems. I dont have a recipe, bu ...
11-7-2021 at 18:12
by: Twospoons
thermoelectric cooling bath
[rquote=662473&tid=157673&author=mr_bovinejony] Has anyone else seen these things? They're p ...
4-7-2021 at 17:11
by: Twospoons
Depositing a layer of Cu on perlite
Are you more interested in the chemistry or the water purification? - because if the end result is a ...
24-6-2021 at 18:52
by: Twospoons
Lost 5 L HNO3 stored in HDPE Kanister
I had the same experience many years ago. 10 litre HDPE container with a pinhole leak in a seam. Luc ...
6-6-2021 at 13:32
by: Twospoons
Any use for broken/crushed quartz glass from tubes - or ULTRA high output UVC bulbs - 12-16KW/bulb?
[rquote=660938&tid=157531&author=Fyndium]Household mains is not even able to supply single o ...
30-5-2021 at 14:37
by: Twospoons
Any use for broken/crushed quartz glass from tubes - or ULTRA high output UVC bulbs - 12-16KW/bulb?
Melt cast them into a thick disk and then grind a parabolic primary mirror for a telescope. The very ...
29-5-2021 at 02:02
by: Twospoons
Ideas for Engineering In-Demand Lab Equipment
[rquote=660792&tid=157522&author=LabDIRECT]

My first thought was a heating mantle/hot pla ...
26-5-2021 at 19:22
by: Twospoons
Red Cabbage pH test
For my daughters 7th birthday (a long time ago) we had a harry potter theme. Red cabbage was centra ...
20-5-2021 at 20:12
by: Twospoons
Does anyone have experience with silicon wafers?
So you want to invest half a million bucks into equipment to make your own chips?

The closest I'v ...
19-5-2021 at 20:37
by: Twospoons
how would it change if world population went to 500m?
World pop was ~500 million around 1600AD. So theres some clues there. Of course we have a lot more k ...
16-5-2021 at 02:07
by: Twospoons
wall wart as power supply for electrolysis
TBH you'd be better off investing in a proper variable bench power supply. It will (should) be more ...
14-5-2021 at 18:44
by: Twospoons
Flashlight power and grow light power
I saw a paper once that suggested broadband lighting was better for plants. The study found that so ...
2-5-2021 at 13:53
by: Twospoons
Low resistance electrolytic cell divider
[rquote=656703&tid=157195&author=goldberg]
U-shaped tube filled with KCl solution gelled by ...
20-3-2021 at 20:11
by: Twospoons
Large Quartz Tubes For Cheap? - Patio Heater
See if it will pass short UV light. If it does then its quartz.

[Edited on 18-3-2021 by Twospoons]
17-3-2021 at 16:20
by: Twospoons
Question about pressure
If adding a stirbar is going to break the vessel, then you are already operating too close to the fa ...
21-2-2021 at 15:25
by: Twospoons
Most expensive mistakes you've made?
Blew up a $1000 magnetic field probe while poking around inside a power supply. Lucky for me the $25 ...
14-2-2021 at 11:11
by: Twospoons
How to handle powders without dusting?
[rquote=653920&tid=155805&author=Fyndium]
What are efficient methods at neutralizing static ...
29-1-2021 at 00:36
by: Twospoons
Sulfuric & Nitric Acid In Australia
Watch those plastic drums! The plastic "jerry can" style containers my Nitric came in developed tiny ...
20-1-2021 at 14:00
by: Twospoons
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