File:Characteristic equations for saturated and superheated steam (1913) (14780166632).jpg

Identifier: characteristiceq00simm (find matches)
Title: Characteristic equations for saturated and superheated steam
Year: 1913 (1910s)
Authors: Simmering, Siebelt Luke
Subjects: Steam Steam, Superheated Theses
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Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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the isother-mals of Battelli, Regnault -Zeuner and the Munich experi-ments. The Begnault - Zeuner points were determined using A= —i- instead of A = —as used in the Munich experiments,424 427 . so that the Regnault - Zeuner and Munich points lie muchcloser together than the figure would indicate. From thisfact it is to be concluded, that the Munich experiments re-present the true conditions very closely. Another set of experiments bearing on a different phase of this subject, namely specific heats, was performed by5 Regnault. From his early experiments on specific heats heconcluded that the specific heat of superheated steam atatmospheric pressure was the constant value 0.48 for alltemperatures. 2 The more recent experiments of Knoblauch and Jakob and also of Knoblauch and Mollier, at the Munich laboratory do not support Regnaults conclusion. From these experiments there is conclusive evidence that the specific heat C of P superheated steam does depend upon the pressure as well as
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U. OF I. S. S. FORM 3 5 the temperature. Examination of the specific heat curvesfor various pressures reveals the fact,that as the pressureand temperature become far removed from the saturation con-ditions, the specific heat approaches a common value forall pressures. The experiments of Mallard and Le Chatelier, at about3000°C, and of Langen? at about 1700°C, agree in makingthe specific heat a linear function of the temperature, theeffect of pressure having become negligible. Prof. C.C.Thomas® has concluded an extensive set of ex-periments on steam but the reliability of his methods isquestioned. The following abstract is taken from an articleby Prof. Thomas in the A.o.M.E. Trans. Vol. 29; The whole operation of drying the steam prepara-tory to evaporating it, and of superheating it tosome desired temperature above that of saturationis done in the one calorimeter. The apparatusthus consists essentially of one calorimeter, onethermometer, a source of steam and a source ofheat in the

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