powder flow

Question 1

when does a powder flow

Answer 1

when driving forces > retardant forces

Question 2

what is adhesion

Answer 2

attractive forces between 2 chemically different surfaces

Question 3

what is cohesion

Answer 3

attractive forces between 2 chmically similar surfaces

Question 4

gravitational flow:

Answer 4

greater particle mass greater flow

Question 5

electrical forces:

Answer 5

opposite charges attract and like charges repel

Question 6

what does electrical forces depend on

Answer 6

magnitude of charge and separate distance between surfaces

Question 7

what will increase flow-

size

Answer 7

larger

Question 8

what will increase flow-

shape

Answer 8

more sphere

Question 9

what will increase flow-

Sa

Answer 9

smaller

Question 10

what will increase flow-

density

Answer 10

higher

Question 11

what will increase flow-

packing geometry

Answer 11

looser

Question 12

what will increase flow-

moisture content

Answer 12

moderate

Question 13

smaller particles have a

Answer 13

smaller SA

Larger specific SA

Question 14

spec SA=

Answer 14

total sa/mass

Question 15

particle size- smaller particles have a

Answer 15

larger spec SA
more cohesive
poor flow

Question 16

particle shape- sphere particle with smaller SA

Answer 16

non-spherical