Questions tagged [granulated-materials]

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11
votes
1answer
230 views

Why do random slabs stay dry in the rain? [closed]

The image below shows the slabbed area I can see from my work window Whenever it rains some of the slabs stay dry however, it is never consistent which ones. Can anyone explain why this happens to ...
9
votes
5answers
1k views

Is there a definite boundary between a powder and a fluid?

Given a powder of solid substance what will happen if we make the granules smaller and smaller mechanically? Will this eventually make a liquid or gas from the powder? Can there be gaseous substanse ...
2
votes
1answer
49 views

Is there a name for this phenomenon?

Imagine I have a cylindrical pipe closed on both ends with lids. I fill it with sand and compress the sand tightly. Now I hold the cylinder vertically and remove the bottom lid. The sand will counter ...
2
votes
2answers
471 views

Definition of granular material

I am doing a project on some properties of granular materials. I might have to face people who ask the definition of granular material. How can we define granular materials? One answer is "it is sand-...
2
votes
2answers
128 views

Are there materials that strongly (macroscopically) vibrate under light of certain frequencies? If so why?

Picture an imperfect plane of loose particulate matter like sand or silt. Are there materials where if I shine light (not isotropically) on the plane I could get the particles to vibrate with large ...
2
votes
1answer
4k views

formula for the angle of repose

If we make piles of sand or of sugar, they form cones; the maximum slope of the cones depends on the material. Is there a formula which gives this slope (or the angle of the cone), given some ...
2
votes
1answer
62 views

Suffocation in a granular medium

I read of a recent accident in Alberta in which three girls fell into an open bed truck carrying canola seeds and suffocated. In that situation would it have been possible to keep breathing by using ...
1
vote
1answer
550 views

Particles separation by shaking [duplicate]

In granulometry, say I have a tube with an heterogeneous mix of particles of different sizes (sand and stones, by instance). The tube is vertical in the usual gravity field and is placed in the air. ...
1
vote
0answers
22 views

How to classify archimedean solid quasicrystal made by stacking spheres

I have two sphere packing structures (i.e. 3N-coordinates of each structure). One is rhombicosidodecahedron and the other one is truncated icosahedron. They are clearly distinguished when they are ...
1
vote
0answers
103 views

Force required to break electrostatic bonds between granular matter

I'm working with a powder mass that is separated into different samples, each having a varying degree of water and oil content. They're stored for a fixed amount of time and then conditioned to reach ...
0
votes
1answer
52 views

Objects in granular medium

If a spherical object of certain radius and mass (let's say 10 ft, 3,000kg) is placed in a granular medium such as sand. How can you calculate the max depth to which the object would sink?
0
votes
0answers
14 views

Determination of Angle of Repose in cohesive granular material

Is there a procedure for determining the static angle of repose for cohesive granular materials? I found one called the angle-composition plot method (referenced here: https://www.researchgate.net/...
0
votes
0answers
271 views

Why valence electron to atom ratio affect stacking fault energy?

Wikipedia article on factors that affect the stacking-fault energy (SFE) of a material says: Another factor that has a significant effect on the SFE of a material and is very interrelated with ...