Characteristic equations for saturated and superheated steam . g a too rapid decrease in the totalheat values. Likewise the volumes v, in all probability,were too small. A further correction was found necessary when the spe-cific heat values were determined near the saturation line. 16 They were found to be too low and in order to raise thesevalues it was necessary to add a third tern to the function^T, which then became, = A + BT + ~£ • The values of the constants are, A=.301; B=.00025£; C= these values when used in conjunction with the preced-ing values given for log M, B, n, and a
Characteristic equations for saturated and superheated steam . g a too rapid decrease in the totalheat values. Likewise the volumes v, in all probability,were too small. A further correction was found necessary when the spe-cific heat values were determined near the saturation line. 16 They were found to be too low and in order to raise thesevalues it was necessary to add a third tern to the function^T, which then became, = A + BT + ~£ • The values of the constants are, A=.301; B=.00025£; C= these values when used in conjunction with the preced-ing values given for log M, B, n, and a, there existed asatisfactory agreement with the Knoblauch and Mollier ex-perimental points. When however, a comparison was made with 7 the experiments of Langen at high temperatures, the calcu-lated specific heat curves were found to be too low. After repeated attempts to correct these difficulties,it was decided, that a different form of the characteristicequation was needed. The results of the further investiga-tion are given in the following 18 Part Revised meet the objections raised by Davis and Heck and alsoto embody the conclusions set forth at the beginning ofthis discussion, the characteristic equation has been giv-en the form, pv = BT - p(l+ 3aps)| metric units B=; 3a=; log M=; n = equation is essentially the same as the previous equa-tion with the exception of the p term within the paren- i thesis. The combined value of 3ap- being materially greaterthan the single term ap of the former equation. Taking thesquare root of p instead of the first power has a very ben-ifioial effect upon all the values above 400°F. Comparingthe latent heat values of the table on page 25 and thecurves on the preceding page, it is seen very clearly, thatthe Clapeyron - Clausius relation has been satisfied to amarked degree. The specific heat formula becomes, and the total heat formula becomes, iaat=A!E + *Bl2 -|- !Ma±i!p(l +
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