From 54fe7582ececf74eadd85c411e6fd534730769b1 Mon Sep 17 00:00:00 2001 From: Gerry Knapp Date: Fri, 30 Jan 2026 13:59:11 -0500 Subject: [PATCH 1/4] fix marangoni coefficient sign in Inconel Mist files --- src/myna/mist_material_data/IN625.json | 2 +- src/myna/mist_material_data/IN718.json | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/myna/mist_material_data/IN625.json b/src/myna/mist_material_data/IN625.json index ccc32e87..e1e5e43f 100644 --- a/src/myna/mist_material_data/IN625.json +++ b/src/myna/mist_material_data/IN625.json @@ -57,7 +57,7 @@ }, "marangoni_coefficient": { "print_name": "Marangoni coefficient", - "value": 2.0e-5, + "value": -2.0e-5, "unit": "N/(m~K)", "reference": "Z. Gan, Y. Lian, S.E. Lin, K.K. Jones, W.K. Liu, G.J. Wagner, Benchmark Study of Thermal Behavior, Surface Topography, and Dendritic Microstructure in Selective Laser Melting of Inconel 625, Integrating Materials and Manufacturing Innovation 8(2) (2019) 178-193.", "uncertainty": "None", diff --git a/src/myna/mist_material_data/IN718.json b/src/myna/mist_material_data/IN718.json index 1cdd5054..50907f19 100644 --- a/src/myna/mist_material_data/IN718.json +++ b/src/myna/mist_material_data/IN718.json @@ -57,7 +57,7 @@ }, "marangoni_coefficient": { "print_name": "Marangoni coefficient", - "value": 2.0e-5, + "value": -2.0e-5, "unit": "N/(m~K)", "reference": "Z. Gan, Y. Lian, S.E. Lin, K.K. Jones, W.K. Liu, G.J. Wagner, Benchmark Study of Thermal Behavior, Surface Topography, and Dendritic Microstructure in Selective Laser Melting of Inconel 625, Integrating Materials and Manufacturing Innovation 8(2) (2019) 178-193.", "uncertainty": "None", From 52160b96c129c3ac05ca4b12650ab42bff66a663 Mon Sep 17 00:00:00 2001 From: Gerry Knapp Date: Fri, 30 Jan 2026 13:59:33 -0500 Subject: [PATCH 2/4] add marangoni coefficient value to SS316 Mist files --- src/myna/mist_material_data/SS316H.json | 10 +++++++++- src/myna/mist_material_data/SS316L.json | 10 +++++++++- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/src/myna/mist_material_data/SS316H.json b/src/myna/mist_material_data/SS316H.json index 343dda79..5af0c091 100644 --- a/src/myna/mist_material_data/SS316H.json +++ b/src/myna/mist_material_data/SS316H.json @@ -129,7 +129,15 @@ "reference": "None", "uncertainty": "None", "print_symbol": "\\alpha" + }, + "marangoni_coefficient": { + "print_name": "Marangoni coefficient", + "value": -4.0e-5, + "unit": "N/(m~K)", + "reference": "K.C. Mills, Y. Su, Z. Li, R.F. Brooks, Equations for the calculation of the thermo-physical properties of stainless steel, ISIJ international 44(10) (2004) 1661-1668. DOI: https://doi.org/10.2355/isijinternational.44.1661.", + "uncertainty": "None", + "print_symbol": "\frac{\\partial \\gamma}{\\partial T}" } }, - "note": "This file currently excludes the surface tension, marangoni coefficient, and the vapor pressure due to the need for function representations other than Laurent polynomials." + "note": "- The Marangoni coefficient in Mills et al. (2004) is evaluated at 1925 K and 0 ppm S\n- This file currently excludes the the vapor pressure due to the need for function representations other than Laurent polynomials." } diff --git a/src/myna/mist_material_data/SS316L.json b/src/myna/mist_material_data/SS316L.json index e8e4f88f..0c51bb16 100644 --- a/src/myna/mist_material_data/SS316L.json +++ b/src/myna/mist_material_data/SS316L.json @@ -129,7 +129,15 @@ "reference": "None", "uncertainty": "None", "print_symbol": "\\alpha" + }, + "marangoni_coefficient": { + "print_name": "Marangoni coefficient", + "value": -4.0e-5, + "unit": "N/(m~K)", + "reference": "K.C. Mills, Y. Su, Z. Li, R.F. Brooks, Equations for the calculation of the thermo-physical properties of stainless steel, ISIJ international 44(10) (2004) 1661-1668. DOI: https://doi.org/10.2355/isijinternational.44.1661.", + "uncertainty": "None", + "print_symbol": "\frac{\\partial \\gamma}{\\partial T}" } }, - "note": "This file currently excludes the surface tension, marangoni coefficient, and the vapor pressure due to the need for function representations other than Laurent polynomials." + "note": "- The Marangoni coefficient in Mills et al. (2004) is evaluated at 1925 K and 0 ppm S\n- This file currently excludes the the vapor pressure due to the need for function representations other than Laurent polynomials." } From f01a24f14c26a07a7366217726c9145598142e01 Mon Sep 17 00:00:00 2001 From: Gerry Knapp Date: Tue, 3 Feb 2026 09:09:02 -0500 Subject: [PATCH 3/4] fixup: order of magnitude for SS316 marangoni --- src/myna/mist_material_data/SS316H.json | 2 +- src/myna/mist_material_data/SS316L.json | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/myna/mist_material_data/SS316H.json b/src/myna/mist_material_data/SS316H.json index 5af0c091..deec2611 100644 --- a/src/myna/mist_material_data/SS316H.json +++ b/src/myna/mist_material_data/SS316H.json @@ -132,7 +132,7 @@ }, "marangoni_coefficient": { "print_name": "Marangoni coefficient", - "value": -4.0e-5, + "value": -4.0e-4, "unit": "N/(m~K)", "reference": "K.C. Mills, Y. Su, Z. Li, R.F. Brooks, Equations for the calculation of the thermo-physical properties of stainless steel, ISIJ international 44(10) (2004) 1661-1668. DOI: https://doi.org/10.2355/isijinternational.44.1661.", "uncertainty": "None", diff --git a/src/myna/mist_material_data/SS316L.json b/src/myna/mist_material_data/SS316L.json index 0c51bb16..1e026b1f 100644 --- a/src/myna/mist_material_data/SS316L.json +++ b/src/myna/mist_material_data/SS316L.json @@ -132,7 +132,7 @@ }, "marangoni_coefficient": { "print_name": "Marangoni coefficient", - "value": -4.0e-5, + "value": -4.0e-4, "unit": "N/(m~K)", "reference": "K.C. Mills, Y. Su, Z. Li, R.F. Brooks, Equations for the calculation of the thermo-physical properties of stainless steel, ISIJ international 44(10) (2004) 1661-1668. DOI: https://doi.org/10.2355/isijinternational.44.1661.", "uncertainty": "None", From 7cdcfcded85a42b2bf5e05f92b3f2a17fbf0e669 Mon Sep 17 00:00:00 2001 From: Gerry Knapp Date: Tue, 3 Feb 2026 10:45:57 -0500 Subject: [PATCH 4/4] update notes in IN627 and IN718 files --- src/myna/mist_material_data/IN625.json | 2 +- src/myna/mist_material_data/IN718.json | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/myna/mist_material_data/IN625.json b/src/myna/mist_material_data/IN625.json index e1e5e43f..764d54d4 100644 --- a/src/myna/mist_material_data/IN625.json +++ b/src/myna/mist_material_data/IN625.json @@ -136,5 +136,5 @@ "print_symbol": "\\alpha" } }, - "note": "None." + "note": "- The Marangoni coefficient in Gan et al. (2019) is based on fitting of a thermofluidic model to experimental data, not direct measurement" } diff --git a/src/myna/mist_material_data/IN718.json b/src/myna/mist_material_data/IN718.json index 50907f19..99955e5e 100644 --- a/src/myna/mist_material_data/IN718.json +++ b/src/myna/mist_material_data/IN718.json @@ -136,5 +136,5 @@ "print_symbol": "\\alpha" } }, - "note": "All temperature-dependent expressions use units of K. The dynamic viscosity and Marangoni coefficent values are from IN625 references. The latent heat of vaporization and molecular mass are taken from pure nickel references. The emissivity is an estimate of total hemispherical emissivity on a smooth surface. Actual emissivity depends on the surface condition." + "note": "- The Marangoni coefficient in Gan et al. (2019) is based on fitting of a thermofluidic model to experimental data, not direct measurement\n- All temperature-dependent expressions use units of K\n- The dynamic viscosity and Marangoni coefficent values are from IN625 references\n- The latent heat of vaporization and molecular mass are taken from pure nickel references\n- The emissivity is an estimate of total hemispherical emissivity on a smooth surface--actual emissivity depends on the surface condition" }