Recent content by Peter Hessellund

But they must dry out when the humidity is below 75% In my case when the air enters a ventilation duct where the air is heated slightly.

When a bubble in the ocean bursts water drops are thrown into the air. How fast do these water drops dry out creating solid salt particles? There must be a formula for calculating this and I am guessing that the following variables must figure in the formula: - Droplet size - Salt concentration...

Viscosity should maximum be a few hundred centistoke.

As low as possible and with the correct yield stress.

The properties of the liquid should be such that the liquid can be standing still in a system of tubes without separating into fractions even after weeks of zero motion. The liquid should also have a lifetime of at least one year and it should have as low a viscosity as possible. One possibility...

They are not using a Bingham plastic and they are using a suspension.

I am looking for a Bingham plastic that is not a suspension. It can either be in the form of an additive to water or a non conductive chemical. The liquid should have a yield stress of 150 Pa to 250 Pa. What liquid could be used here? Are there companies who tailor make these kind of liquids?

Hi Chester I have already been googeling for hours on question 2 and 3 but the only thing that comes up is general stuff about ketchup or specific stuff about solving the governing equations or simulations. I have so far been unable to find a nice catalogue from a supplier producing a liquid...

Hi Chester You already answered the first question for me. I was googeling yield pressure and getting nothing. The right words were the ones you used in your reply to me:) I still need answers for the two last questions. The formula is: Found in this PDF...

Yes I am asking how much pressure difference is required for flow. I think that I have read somewhere that a larger initial pressure is required for small diameters.

I have three questions. 1. How do I calculate the yield pressure for a Bingham plastic in a tube if I am given: Length of tube Diameter of tube Yield stress of liquid 2. Is it possible to engineer a liquid to have a specific yield stress ? 3. What kind of material would be suited for...