% Evaluates the inverse Graetz number (also Pr and kf)
function [Z, ReD, Pr, kf] = InvGz(um,Dh,L,mat,Tm)
  [ReD, Pr, kf] = Re(um,Dh,mat,Tm);                  
  Z = L./Dh./ReD./Pr;                                
end
