c======================================================================= subroutine massflowrateco2(P,T,Sat,Radius,Matm,Ic) c c Determination of the mass transfer rate for CO2 condensation & c sublimation c c inputs: Pressure (P), Temperature (T), saturation ratio (Sat), c particle radius (Radius), molecular mass of the atm (Matm) c output: MASS FLUX Ic c c Authors: C. Listowski (2014) then J. Audouard (2016-2017) c c c Updates: c -------- c December 2017 - C. Listowski - Simplification of the derivation of c massflowrate by using explicit formula for surface temperature, c No Newton-Raphson routine anymore- see comment at relevant line c======================================================================= USE comcstfi_h, ONLY: pi implicit none include "microphys.h" c arguments: INPUT c ---------- REAL,INTENT(in) :: T,Matm REAL*8,INTENT(in) :: SAT REAL,INTENT(in) :: P DOUBLE PRECISION,INTENT(in) :: Radius c arguments: OUTPUT c ---------- DOUBLE PRECISION,INTENT(out) :: Ic c Local Variables c ---------- DOUBLE PRECISION Tsurf DOUBLE PRECISION C0,C1,C2 DOUBLE PRECISION kmix,Lsub,cond DOUBLE PRECISION Ak call coefffunc(P,T,Sat,Radius,Matm,kmix,Lsub,C0,C1,C2,Ak) Tsurf = 1./C1*dlog(Sat/Ak) + T !Note by CL - dec 2017 (see also technical note) !The above is a simplified version of Tsurf !compared to the one used by Listowski et al. 2014 (Ta), where a !Newton-Raphson routine must be used. Approximations made by !considering the orders of magnitude of the different factors lead to !simplification of the equation 5 of Listowski et al. (2014). !The error compared to the exact value determined by NR iterations !is less than 0.6% for all sizes, pressures, supersaturations !relevant to present Mars. Should also be ok for most conditions !in ancient Mars (However, needs to be double-cheked, as explained in !(Listowski et al. 2013,JGR) cond = 4.*pi*Radius*kmix Ic = cond*(Tsurf-T)/Lsub END c******************************************************************************** subroutine coefffunc(P,T,S,rc,Matm,kmix,Lsub,C0,C1,C2,Ak) c******************************************************************************** c defini la fonction eq 6 papier 2014 (Listowski et al., 2014) use tracer_mod, only: rho_ice_co2 USE comcstfi_h, ONLY: pi implicit none include "microphys.h" c arguments: INPUT c ---------------- REAL,INTENT(in) :: P REAL,INTENT(in) :: T REAL*8,INTENT(in) :: S DOUBLE PRECISION,INTENT(in) :: rc REAL,INTENT(in) :: Matm !g.mol-1 ( = mmean(ig,l) ) c arguments: OUTPUT c ---------- DOUBLE PRECISION,INTENT(out) :: C0,C1,C2 DOUBLE PRECISION,INTENT(out) :: kmix,Lsub c local: c ------ DOUBLE PRECISION Cpatm,Cpn2,Cpco2 DOUBLE PRECISION psat, xinf, pco2 DOUBLE PRECISION Dv DOUBLE PRECISION l0,l1,l2,l3,l4 DOUBLE PRECISION knudsen, a, lambda ! F and S correction DOUBLE PRECISION Ak ! kelvin factor DOUBLE PRECISION vthatm,lpmt,rhoatm, vthco2 ! for Kn,th c DEFINE heat cap. J.kg-1.K-1 and To data Cpco2/0.7e3/ data Cpn2/1e3/ kmix = 0d0 Lsub = 0d0 C0 = 0d0 C1 = 0d0 C2 = 0d0 c Equilibirum pressure over a flat surface psat = 1.382 * 1.00e12 * exp(-3182.48/dble(T)) ! (Pa) c Compute transport coefficient pco2 = psat * dble(S) c Latent heat of sublimation if CO2 co2 (J.kg-1) c version Azreg_Ainou (J/kg) : l0=595594. l1=903.111 l2=-11.5959 l3=0.0528288 l4=-0.000103183 Lsub = l0 + l1 * dble(T) + l2 * dble(T)**2 + l3 * & dble(T)**3 + l4 * dble(T)**4 ! J/kg c atmospheric density rhoatm = dble(P*Matm)/(rgp*dble(T)) ! g.m-3 rhoatm = rhoatm * 1.00e-3 !kg.m-3 call KthMixNEW(kmix,T,pco2/dble(P),rhoatm) ! compute thermal cond of mixture co2/N2 call Diffcoeff(P, T, Dv) Dv = Dv * 1.00e-4 !!! cm2.s-1 to m2.s-1 c ----- FS correction for Diff vthco2 = sqrt(8d0*kbz*dble(T)/(dble(pi) * mco2/nav)) ! units OK: m.s-1 knudsen = 3*Dv / (vthco2 * rc) lambda = (1.333+0.71/knudsen) / (1.+1./knudsen) ! pas adaptée, Dahneke 1983? en fait si (Monschick&Black) Dv = Dv / (1. + lambda * knudsen) c ----- FS correction for Kth vthatm = sqrt(8d0*kbz*dble(T)/(pi * 1.00e-3*dble(Matm)/nav)) ! Matm/nav = mass of "air molecule" in G , *1e-3 --> kg Cpatm = Cpco2 * pco2/dble(P) + Cpn2 * (1d0 - pco2/dble(P)) !J.kg-1.K-1 lpmt = 3 * kmix / (rhoatm * vthatm * (Cpatm - 0.5*rgp/ & (dble(Matm)*1.00e-3))) ! mean free path related to heat transfer knudsen = lpmt / rc lambda = (1.333+0.71/knudsen) / (1.+1./knudsen) ! pas adaptée, Dahneke 1983? en fait si (Monschick&Black) kmix = kmix / (1. + lambda * knudsen) c --------------------- ASSIGN coeff values for FUNCTION xinf = dble(S) * psat / dble(P) Ak = exp(2d0*sigco2*mco2/(rgp* dble(rho_ice_co2*T* rc) )) C0 = mco2*Dv*psat*Lsub/(rgp*dble(T)*kmix)*Ak*exp(-Lsub*mco2/ & (rgp*dble(T))) C1 = Lsub*mco2/(rgp*dble(T)**2) C2 = dble(T) + dble(P)*mco2*Dv*Lsub*xinf/(kmix*rgp*dble(T)) END c====================================================================== subroutine Diffcoeff(P, T, Diff) c Compute diffusion coefficient CO2/N2 c cited in Ilona's lecture - from Reid et al. 1987 c====================================================================== IMPLICIT NONE include "microphys.h" c arguments c ----------- REAL,INTENT(in) :: P REAL,INTENT(in) :: T c output c ----------- DOUBLE PRECISION,INTENT(out) :: Diff c local c ----------- REAL Pbar !!! has to be in bar for the formula DOUBLE PRECISION dva, dvb, Mab ! Mab has to be in g.mol-1 Pbar = P * 1d-5 Mab = 2. / ( 1./mn2 + 1./mco2 ) * 1000. dva = 26.9 ! diffusion volume of CO2, Reid et al. 1987 (cited in Ilona's lecture) dvb = 18.5 ! diffusion volume of N2 Diff = 0.00143 * dble(T)**(1.75) / (dble(Pbar) * sqrt(Mab) & * (dble(dva)**(1./3.) + dble(dvb)**(1./3.))**2.) !!! in cm2.s-1 RETURN END c====================================================================== subroutine KthMixNEW(Kthmix,T,x,rho) c Compute thermal conductivity of CO2/N2 mixture c (***WITHOUT*** USE OF VISCOSITY) c (Mason & Saxena, 1958 - Wassiljeva 1904) c====================================================================== implicit none include "microphys.h" c arguments c ----------- REAL,INTENT(in) :: T DOUBLE PRECISION,INTENT(in) :: x DOUBLE PRECISION,INTENT(in) :: rho !kg.m-3 c outputs c ----------- DOUBLE PRECISION,INTENT(out) :: Kthmix c local c ------------ DOUBLE PRECISION x1,x2 DOUBLE PRECISION Tc1, Tc2, Pc1, Pc2 DOUBLE PRECISION A12, A11, A22, A21 DOUBLE PRECISION Gamma1, Gamma2, M1, M2 DOUBLE PRECISION lambda_trans1, lambda_trans2,epsilon DOUBLE PRECISION kco2, kn2 x1 = x x2 = 1d0 - x M1 = mco2 M2 = mn2 Tc1 = 304.1282 !(Scalabrin et al. 2006) Tc2 = 126.192 ! (Lemmon & Jacobsen 2003) Pc1 = 73.773 ! (bars) Pc2 = 33.958 ! (bars) Gamma1 = 210.*(Tc1*M1**(3.)/Pc1**(4.))**(1./6.) Gamma2 = 210.*(Tc2*M2**(3.)/Pc2**(4.))**(1./6.) c Translational conductivities lambda_trans1 = ( exp(0.0464 * T/Tc1) - exp(-0.2412 * T/Tc1) ) & /Gamma1 lambda_trans2 = ( exp(0.0464 * T/Tc2) - exp(-0.2412 * T/Tc2) ) & /Gamma2 c Coefficient of Mason and Saxena epsilon = 1. A11 = 1. A22 = 1. A12 = epsilon * (1. + sqrt(lambda_trans1/lambda_trans2)* & (M1/M2)**(1./4.))**(2.) / sqrt(8*(1.+ M1/M2)) A21 = epsilon * (1. + sqrt(lambda_trans2/lambda_trans1)* & (M2/M1)**(1./4.))**(2.) / sqrt(8*(1.+ M2/M1)) c INDIVIDUAL COND. call KthCO2Scalab(kco2,T,rho) call KthN2LemJac(kn2,T,rho) c MIXTURE COND. Kthmix = kco2*x1 /(x1*A11 + x2*A12) + kn2*x2 /(x1*A21 + x2*A22) Kthmix = Kthmix*1e-3 ! from mW.m-1.K-1 to W.m-1.K-1 END c====================================================================== subroutine KthN2LemJac(kthn2,T,rho) c Compute thermal cond of N2 (Lemmon and Jacobsen, 2003) cWITH viscosity c====================================================================== implicit none include "microphys.h" c include "microphysCO2.h" c arguments c ----------- REAL,INTENT(in) :: T DOUBLE PRECISION,INTENT(in) :: rho !kg.m-3 c outputs c ----------- DOUBLE PRECISION,INTENT(out) :: kthn2 c local c ------------ DOUBLE PRECISION g1,g2,g3,g4,g5,g6,g7,g8,g9,g10 DOUBLE PRECISION h1,h2,h3,h4,h5,h6,h7,h8,h9,h10 DOUBLE PRECISION n1,n2,n3,n4,n5,n6,n7,n8,n9,n10 DOUBLE PRECISION d4,d5,d6,d7,d8,d9 DOUBLE PRECISION l4,l5,l6,l7,l8,l9 DOUBLE PRECISION t2,t3,t4,t5,t6,t7,t8,t9 DOUBLE PRECISION gamma4,gamma5,gamma6,gamma7,gamma8,gamma9 DOUBLE PRECISION Tc,rhoc DOUBLE PRECISION tau, delta DOUBLE PRECISION visco DOUBLE PRECISION k1, k2 N1 = 1.511d0 N2 = 2.117d0 N3 = -3.332d0 N4 = 8.862 N5 = 31.11 N6 = -73.13 N7 = 20.03 N8 = -0.7096 N9 = 0.2672 t2 = -1.0d0 t3 = -0.7d0 t4 = 0.0d0 t5 = 0.03 t6 = 0.2 t7 = 0.8 t8 = 0.6 t9 = 1.9 d4 = 1. d5 = 2. d6 = 3. d7 = 4. d8 = 8. d9 = 10. l4 = 0. gamma4 = 0. l5 = 0. gamma5 = 0. l6 = 1. gamma6 = 1. l7 = 2. gamma7 = 1. l8 = 2. gamma8 = 1. l9 = 2. gamma9 = 1. c---------------------------------------------------------------------- call viscoN2(T,visco) !! v given in microPa.s Tc = 126.192d0 rhoc = 11.1839 * 1000 * mn2 !!!from mol.dm-3 to kg.m-3 tau = Tc / T delta = rho/rhoc k1 = N1 * visco + N2 * tau**t2 + N3 * tau**t3 !!! mW m-1 K-1 c--------- residual thermal conductivity k2 = N4 * tau**t4 * delta**d4 * exp(-gamma4*delta**l4) & + N5 * tau**t5 * delta**d5 * exp(-gamma5*delta**l5) & + N6 * tau**t6 * delta**d6 * exp(-gamma6*delta**l6) & + N7 * tau**t7 * delta**d7 * exp(-gamma7*delta**l7) & + N8 * tau**t8 * delta**d8 * exp(-gamma8*delta**l8) & + N9 * tau**t9 * delta**d9 * exp(-gamma9*delta**l9) kthn2 = k1 + k2 END c====================================================================== subroutine viscoN2(T,visco) c Compute viscosity of N2 (Lemmon and Jacobsen, 2003) c====================================================================== implicit none include "microphys.h" c include "microphysCO2.h" c arguments c ----------- REAL,INTENT(in) :: T c outputs c ----------- DOUBLE PRECISION,INTENT(out) :: visco c local c ------------ DOUBLE PRECISION a0,a1,a2,a3,a4 DOUBLE PRECISION Tstar,factor,sigma,M2 DOUBLE PRECISION RGCS c---------------------------------------------------------------------- factor = 98.94 ! (K) sigma = 0.3656 ! (nm) a0 = 0.431 a1 = -0.4623 a2 = 0.08406 a3 = 0.005341 a4 = -0.00331 M2 = mn2 * 1.00e3 !!! to g.mol-1 Tstar = T*1./factor RGCS = exp( a0 + a1 * log(Tstar) + a2 * (log(Tstar))**2. + & a3 * (log(Tstar))**3. + a4 * (log(Tstar))**4. ) visco = 0.0266958 * sqrt(M2*T) / ( sigma**2. * RGCS ) !!! microPa.s RETURN END c====================================================================== subroutine KthCO2Scalab(kthco2,T,rho) c Compute thermal cond of CO2 (Scalabrin et al. 2006) c====================================================================== implicit none c arguments c ----------- REAL,INTENT(in) :: T DOUBLE PRECISION,INTENT(in) :: rho c outputs c ----------- DOUBLE PRECISION,INTENT(out) :: kthco2 c LOCAL c ----------- DOUBLE PRECISION Tc,Pc,rhoc, Lambdac DOUBLE PRECISION Tr, rhor, k1, k2 DOUBLE PRECISION g1,g2,g3,g4,g5,g6,g7,g8,g9,g10 DOUBLE PRECISION h1,h2,h3,h4,h5,h6,h7,h8,h9,h10 DOUBLE PRECISION n1,n2,n3,n4,n5,n6,n7,n8,n9,n10 Tc = 304.1282 !(K) Pc = 7.3773e6 !(MPa) rhoc = 467.6 !(kg.m-3) Lambdac = 4.81384 !(mW.m-1K-1) g1 = 0. g2 = 0. g3 = 1.5 g4 = 0.0 g5 = 1.0 g6 = 1.5 g7 = 1.5 g8 = 1.5 g9 = 3.5 g10 = 5.5 h1 = 1. h2 = 5. h3 = 1. h4 = 1. h5 = 2. h6 = 0. h7 = 5.0 h8 = 9.0 h9 = 0. h10 = 0. n1 = 7.69857587 n2 = 0.159885811 n3 = 1.56918621 n4 = -6.73400790 n5 = 16.3890156 n6 = 3.69415242 n7 = 22.3205514 n8 = 66.1420950 n9 = -0.171779133 n10 = 0.00433043347 Tr = T/Tc rhor = rho/rhoc k1 = n1*Tr**(g1)*rhor**(h1) + n2*Tr**(g2)*rhor**(h2) & + n3*Tr**(g3)*rhor**(h3) k2 = n4*Tr**(g4)*rhor**(h4) + n5*Tr**(g5)*rhor**(h5) & + n6*Tr**(g6)*rhor**(h6) + n7*Tr**(g7)*rhor**(h7) & + n8*Tr**(g8)*rhor**(h8) + n9*Tr**(g9)*rhor**(h9) & + n10*Tr**(g10)*rhor**(h10) k2 = exp(-5.*rhor**(2.)) * k2 kthco2 = (k1 + k2) * Lambdac ! mW END