From 3524b835a42e3b385ac498fd5c224f5e2cec6489 Mon Sep 17 00:00:00 2001 From: David Parkhurst Date: Mon, 17 Aug 2020 09:41:37 -0600 Subject: [PATCH 1/2] added Basic function DEBYE_LENGTH and test case zeta --- RELEASE.TXT | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/RELEASE.TXT b/RELEASE.TXT index fdc494f8..3949cb7b 100644 --- a/RELEASE.TXT +++ b/RELEASE.TXT @@ -1,4 +1,18 @@ Version @PHREEQC_VER@: @PHREEQC_DATE@ + + ---------------- + August 17, 2020 + ---------------- + PHREEQC: A new Basic function DEBYE_LENGTH was added to return the + value of the Debye length, typically notated kappa^-1. The value is + related to the decay of the surface potential with distance from the + surface. Theory says that the potential at distance d from the surface + is equal to psi0*exp(d/DL), where psi0 is the surface potential and DL is + the Debye length. The lengh is inversely related to ionic strength. + Example: + + 10 DL = DEBYE_LENGTH + ---------------- August 11, 2020 ---------------- @@ -10,6 +24,9 @@ Version @PHREEQC_VER@: @PHREEQC_DATE@ KINETICS_RAW, or KINETICS_MIX. Now, the correct proportional relation should be maintained if the moles in EQUILIBRIUM_PHASES or KINETICS are changed. + An error message will result if, for example, EQUILIBRIUM_PHASES is modified + to remove the phase that EXCHANGE is related to. + ---------------- June 7, 2020 ---------------- From f1ddd8af3b3c9428a2434bbfb38049025671d16e Mon Sep 17 00:00:00 2001 From: David Parkhurst Date: Mon, 17 Aug 2020 14:40:41 -0600 Subject: [PATCH 2/2] Tony's changes to implicit Nernst-Planck calculation --- RELEASE.TXT | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/RELEASE.TXT b/RELEASE.TXT index 3949cb7b..2eb55825 100644 --- a/RELEASE.TXT +++ b/RELEASE.TXT @@ -1,4 +1,11 @@ Version @PHREEQC_VER@: @PHREEQC_DATE@ + + ---------------- + August 17, 2020 + ---------------- + PHREEQC: Changes to implicit Nernst Planck calculations for electro-migration. + Concentration-oscillations in 3 cells at the column boundary are now dampened, + which improves the stability of the calculations. ---------------- August 17, 2020