nx_vessel_geometry.nx

nx_vessel_geometry.nx -- C0 of the VESSEL-DESIGN ladder: PARAMETRIC GEOMETRY that derives the thermal-twin parameters from the PHYSICAL shape and materials. Until now the twin's heat capacity and insulation conductance were hand-set; here they fall out of geometry + physics: contents heat capacity C = V * rho * c_p [J/K] insulation conductance U = k * A / d (Fourier) [W/K] So "a 4 L vessel with 5 mm of cork" becomes a fully-specified thermal twin you can certify (H3 / nx_vessel_twin) -- the geometry-to-thermal design loop, closed in software. Change the insulation thickness and re-certify; no prototype required. Cylinder, aspect set by a chosen radius: h = V / (pi r^2). Integer units: volume ml, lengths mm, area mm^2, k in milli-(W/m.K). genealogy_id: lumped_thermal_from_geometry + fourier_conduction_1822