Discussion of Experimental Data

The comparison of the datasets given in Table 5.1 was difficult due to the temperature, pressure, and concentration differences between the measurements. Therefore, a regression analysis based on the schemes discussed in Section 5.3 was employed for the temperature and composition dependence for each isobar. In the analysis that follows, a preliminary comparison is given between the various datasets, aiming to help the reader choose which values to use. It should be 

H2O + Sr(N03)2 Two datasets were found (Abdulagatov et al, 1999a and Abdulagatov et al, 2004a), but published from the same research group. Hence as expected the agreement is very good (deviations within 0.9%). 

H2O -H NaBr Three datasets were found, referring to three research groups (Eldarov, 1986 Magomedov, 1992 Abdulagatov et al, 2004b). All data agree within 0.8%. 

H2O + CdCl2 and H2O + CdBr2 Two datasets were found, referring to two research groups (Eldarov, 1980 Abdulagatov and Magomedov, 1997a). The maximmn deviation between the datasets is 0.5%. 

H2O + LiCl Two datasets were foimd, referring to two research groups (Pepinov and Guseynov, 1992,1993 Abdulagatov and Magomedov, 1997b). Deviations up to 0.73% are observed between the datasets at low temperatures, rising up to 1.9% at temperatures above 473 K and concentrations at 20 mass.%. 

Studied extensively in many laboratories over the past two decades. Consequently, a large body of data exists which can be used for comparison with various models of creep. 

SN 88 This is a commercial gas-pressure-sintered grade of silicon nitride produced by NGK Insulators, Ltd, Nagoya, Japan, for the hot-stage components of ceramic gas turbines. This grade of silicon nitride was extensively studied by Wiederhom et al. [20, 24, 30], by Lofaj et al. [15, 25-27, 34—37], and by Wereszczak et al. [38]. 

In this section, the available data are discussed relating to the three materials chosen for analysis. First, it is shown that most data reported on creep rates do not fit the 

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Here a complicated problem arises for finding a correct modulus, since it depends on the amplitude of deformation. There is no generally accepted method of extrapolating the dependence of the modulus on the amplitude of A to A - 0. Therefore, here during the discussion of experimental data there may always be disagreements. 

Two types of error are generally recognized in discussions of experimental data. One is determinate or systematic error, that is, error which arises from the design of the experiment. The second is indeterminate or random error which arises because the experimental conditions cannot be perfectly controlled. It is assumed... 

Discussion of Experimental Data and Formulating the Starting Position of the Kinetic Model... 

MW Zemansky and RH Dittman, Heat and Thermodynamics, 6th edition, McGraw -Hill, New York, 1981. A classic text for chemists and chemical engineers, with extensive discussion of experimental data. 

Fig. 2. Percentage mass loss in flash evaporation of liquid He from 4.2 K. The curves marked "reversible" and "irreversible" are the solutions of Eqs. (2) and (3). See text for discussion of experimental data points marked A and B.

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