Prandtl number

To process this page used the WaterSteamPro function "wspPRANDTLEHS": prandtl number [-] as function of specific enthalpy h [J/kg], specific entropy s [J/(kg·K)].

It is a function. The range of the validity is within that described in IF-97 and in formulations for the properties included in the equation to calculate sought quantity (see function wspPRANDTLEPT, wspTHERMCONDRT, wspDYNVISRT). Function works as follows. For first the IF-97 region is determined by function wspWATERSTATEAREAHS. Then the original variables are defined for basic equation of IF-97 region at this point (by functions wspPTxHS and wspRT3HS). Then the sought quantity is calculated on these data. Since at some stages the function use iterations, to speed up calculations you may disable precision mode (functions wspGETTOLERANCEMODE and wspSETTOLERANCEMODE) or vary relative precision for internal iterations (functions wspGETTOLERANCE and wspSETTOLERANCE).

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