The size of of a sphere is taken in terms of diameter, but how can we determine the size of an irregular particle like gravels. The size of an irregular particle is taken as an equivalent diameter of a sphere. there are various basis on which the equivalent (nominal) diameter is calculated. the basis of calculation depends on the application we use.
1. The largest dimension of the particle
2. The diameter of a sphere having
a) equal surface area of the particle like in adsorption, catalytic reaction
b) equal volume of particle like in fluid flow past immersed bodies, settling.
c) equal surface/volume of particle like gas liquid interface as in gas bubble
d) the same settling velocity as the particle
3. the size of the mesh screen like in crushing, grinding
1. The largest dimension of the particle
2. The diameter of a sphere having
a) equal surface area of the particle like in adsorption, catalytic reaction
b) equal volume of particle like in fluid flow past immersed bodies, settling.
c) equal surface/volume of particle like gas liquid interface as in gas bubble
d) the same settling velocity as the particle
3. the size of the mesh screen like in crushing, grinding
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