4.2.1. Particle density and specific heat capacity
The density of particles can affect the process in two different
ways. From hydrodynamic point of view, at a constant total volume
of the particles, increasing the particle density causes an escalation
in the minimum fluidization velocity (umf), which can in turn
reduce the overall bed voidage at constant liquid velocity (ul). On
the other hand, changing the particle density has a thermal effect.
Greater particle density leads to higher total mass of the particles,
which in turn rises the mass heat capacity (m.cp) of the particles in
heat absorption.
In the present work in order to properly observe the hydrodynamic
effects of particle density on the heat transfer phenomenon,
the thermal effects are eliminated by keeping the mass heat capacity
(m.cp) of the particles constant when changing the particle
density where total number of the particles (Np z 45,000) was also
constant