Changeset 454 for branches/packed/eml/stage_separators/tray.mso

Timestamp:

Feb 8, 2008, 6:20:12 PM (15 years ago)

Author:

Paula Bettio Staudt

Message:

A new shot. Model with Billet and Schultes correlations

File:

• branches/packed/eml/stage_separators/tray.mso (modified) (4 diffs)

branches/packed/eml/stage_separators/tray.mso

@@ -169 +169 @@
 end
 
-Model packedStageOld as trayBasic
+Model packedStage_Navaes as trayBasic
         PARAMETERS
         PPwater as Plugin(Brief="Physical Properties",
@@ -277 +277 @@
 end
 
-Model packedStage as trayBasic
+Model packedStage_Billet as trayBasic
         PARAMETERS
         a as Real (Brief="surface area per packing volume", Unit='m^2/m^3');
@@ -329 +329 @@
         uV * Across = OutletV.F * vV;
         
-#       "Coefficient of Resistance"
-#       ksi * C^2 * (uL/uV * sqrt(rhoV/rhoL) * (niL/niV)^5.8)^3 = g/1*'s^2/m';
+        "Coefficient of Resistance"
+        ksi * C^2 * (uL/uV * sqrt(rhoV/rhoL) * (niL/niV)^2)^0.5 = g/1*'s^2/m';
         #ksil = Cp * (exp(uL*rhoL/a/niL/200)*(hL/hLs)^0.3) * (64/Rev+(1.8/Rev)) *
         ksil = Cp * (exp(uL*rhoL/a/niL/200)*(hL/hLs)^0.3) * (64/Rev+(1.8/Rev)) *
-                                        ((e-hL)/e);
+                                        ((e-hL)/e)^1.5;
         
 #       "Liquid holdup and Liquid flow"
@@ -345 +345 @@
 
         "Theoretical Liquid Holdup"
-        #hLs = (12*a^2*niL*uL/g/rhoL)^0.333;
-        hLs = (12*a^2*niL*uL/g/rhoL);
+        hLs = (12*a^2*niL*uL/g/rhoL)^0.333;
+        #hLs = (12*a^2*niL*uL/g/rhoL);
+end
+
+Model packedStage_BilletSchultes as trayBasic
+        PARAMETERS
+        a as Real (Brief="surface area per packing volume", Unit='m^2/m^3');
+        g as acceleration;
+        e as Real (Brief="Void fraction of packing, m^3/m^3");
+        ds as length (Brief="Column diameter");
+        Cpo as Real (Brief="Constant for resitance equation"); # Billet and Schultes, 1999.
+        Mw(NComp)       as molweight    (Brief = "Component Mol Weight");
+
+        VARIABLES
+        miL as viscosity (Brief="Liquid dynamic viscosity", DisplayUnit='kg/m/s');
+        miV as viscosity (Brief="Vapor dynamic viscosity", DisplayUnit='kg/m/s');
+        rhoL as dens_mass;
+        rhoV as dens_mass;
+        uL as velocity (Brief="volume flow rate of liquid, m^3/m^2/s", Default = 0.007);
+        uV as velocity (Brief="volume flow rate of vapor, m^3/m^2/s", Default = 1.14);
+        hs as length (Brief="Height of the packing stage");
+        dp as length (Brief="Particle diameter");
+        K as Real (Brief="Wall factor");
+        Rev as Real (Brief="Reynolds number of the vapor stream");
+        Qsio as Real (Brief="Resistance coefficient");
+        
+        SET
+        Mw = PP.MolecularWeight();
+        
+        EQUATIONS
+        "Liquid Density"
+        rhoL = PP.LiquidDensity(OutletL.T, OutletL.P, OutletL.z);
+        "Vapour Density"
+        rhoV = PP.VapourDensity(InletV.T, InletV.P, InletV.z);
+        "Liquid viscosity"
+        miL = PP.LiquidViscosity(OutletL.T, OutletL.P, OutletL.z);
+        "Vapour viscosity"
+        miV = PP.VapourViscosity(InletV.T, InletV.P, InletV.z);
+
+        "Volume flow rate of liquid, m^3/m^2/s"
+        uL * Ap = OutletL.F * vL;
+        "Volume flow rate of vapor, m^3/m^2/s"
+        uV * Ap = OutletV.F * vV;
+        
+#       "Liquid holdup and Liquid flow"
+#       vL * ML = (12*miL*a^2*uL/rhoL/g)^1/3 * hs * Ap;
+        
+        "Particle diameter"
+        dp = 6 * ((1-e)/a);
+        
+        "Wall Factor"
+        1 = K * 1+(2*dp/(3*ds*(1-e)));
+        
+        "Reynolds number of the vapor stream"
+        Rev = K*dp*uV*rhoV / (miV*(1-e));
+        
+        #"Resistance Coefficient"
+        #Qsio = Cpo * (64/Rev) + 1.8/Rev^0.08);
+        #Qsio = Cpo * (64/Rev);# + 1.8/Rev^0.08);
+
+        "Pressure drop and Vapor flow"
+        (InletV.P - OutletV.P)/hs = Qsio*a*uV^2*rhoV / (2*e^2*K);
 end