1) Model Equations:
a) fluidized Bed Drying Equations.
b) Definition of Equation Variables.
2) TK Solver Rule
Sheet
------------------Fluidized
Bed Equations----------------------------------
Vom=((«Ás*dp*g*(rhop-rho)*«»^3)/(1.75*rho))^.5
uT=(2.32*Vom)/(«»^1.5)
ub=0.7*((g*db)^.5)
U=fb*ub+(1-fb)*Vom
------------------Heat
Transfer Coefficient (ho)---------------------------
G=rho*uT
ho*dp/kf = 2.0 + 0.60*((dp*G/«¼f)^.5)*((cp*«¼f*4.186/kf)^(1/3))
------------------Mass
Transfer Coefficient (kc)---------------------------
Vca=Ma/denca
Vcb=Mb/dencb
Dab = ((0.01498*T^1.81)*(1/Ma + 1/Mb)^.5)/((P*(Tca*Tcb)^.1405)*(Vca^.4 + Vcb^.4)^2)
Sc=«¼f/(rho*Dab)
Re=rho*U*dp/«¼f
«»*jD = (0.765/Re^0.82)+(0.365/Re^0.386)
jD=(kc/ub)*Sc^(2/3)
-----------------------------------------------to top
of rule sheet -------------------------
fluidized
Bed Drying Equations
V om = (
[(es)(dp)(g)(rhop-rho)(i)3]
/
[(1.75)(rho)]
) 0.5
uT
= (2.32)(Vom) / (i)1.5
ub
= (0.7) ( [(g)(dp)]
)0.5
U
= (fb)(ub) + (1-fb)(Vom)
definition of equation
variables
Vom
is the minimal superficial velocity for fluidization
es is the spericity
of the particle
dp is the average
bubble diameter
rhop is the density of the particle
rho is the density of the
air
i
is the prosity of the particle