ABSTRACT
The concentration of particles suspended in gas or liquid is expressed in several ways. The various defi nitions of particle concentration are summarized as follows:
1. Mass fl ow ratio m (–):
m W Q
(3.1)
where W and Q are the mass fl ow rates of particles and fl uid, respectively. 2. Flow concentration c (kg/m 3 ):
c W Q m
(3.2)
where Q v is the volumetric fl uid fl ow rate and r
by the particle density r p , it becomes dimensionless and is called the volumetric concentration.
