Pattern identification and Froude Number

Jie Li

Hi,

Reynolds number and Froude number are the two dimensionless parameters for judging the dynamic similarity. Therefore, both could be employed to quantify the regime transition. In gas-solid two-phase systems, the value of Fr=Umf^2/dp.g has been employed to evaluate the flow patterns( <1: uniform, >1 aggregative ).

Questions:

1) who can tell me the physical meaning of Fr. ?

2) what is, how to choose, the character velocity in Fr. ?

Are there some books or references introducing this in details ?

3) some examples of Fr applying for the flow pattern identification in single phase flow and/or in multiphase flows?

Many thanks !

Jie Li