Specific Heat Capacity of Pure Water at 4.0 MPa between 298.15 and 465.65 K

Abstract

The present work reports experimental results concerning the specific isobaric heat capacity of pure water at elevated pressure. Experiments were performed using a Tian–Calvet differential scanning calorimeter (Setaram Model BT2.15), at temperatures ranging from 298.15 to 465.65 K and at a constant pressure of 4.0 MPa. The aim of this study is to compare the new experimental results with values predicted by the IAPWS-95 formulation, which is generally accepted as reliable by the scientific community despite the fact that, in this formulation, nearly all the data for the isobaric heat capacity of water are based on measurements of Sirota’s group in the former Soviet Union in the period from 1956 to 1970. The present calorimetric results for the specific heat capacity of pure water were found to be substantially in disagreement with the values obtained using the IAPWS-95 formulation, especially at high temperatures, where the differences are greater than 20%. Additional studies are therefore warranted in order to confirm this discrepancy.

Measurement of isobaric heat capacity of pure water up to supercritical conditions

“…On the other hand, IAPWS-95 formulation is not in good agreement with the data in the work of Ernst and Philippi [11] and Manya et al [13]. Fig.…”

“…Fig. 3 shows that the data presented by Manya's group [13] in 2011 for the specific heat capacity of pure water were in disagreement with the values calculated from the IAPWS-95 formulation, especially at high temperature and high pressure, where the deviation is up to 27.2%; in the near critical region, the deviation between the specific heat capacity data reported by Ernst's group [11] in 1990 and the values calculated from the IAPWS-95 formulation is up to 98%. Therefore, new reliable experimental data for isobaric heat capacity of pure water are necessary to complete the nonexperimental data region and to improve the accuracy of the IAPWS-95 formulation.…”

“…15-473.15) K and pressures from p = (250-3500) MPa in 1998; Manya et al [13] reported the c p data for water at temperatures from T = (298. 15-465.65) K at 0.1 MPa and 4 MPa in 2012; Zheng et al [14] reported the c p data for water at temperatures from T = (294-353) K and pressures from p = (0.1-15) MPa in 2014, as shown in Fig.…”

The Difference Between the Effect of Electromagnetic and Magnetic Fields on the Viscosity Coefficients of Cutting Fluids Used in Cutting Processes

“…Long horizontal hexagon bolts (9,10,11,12,13,14) are fixed according to width of the magnets, and holders (5,6,7,8) are fixed to hold magnets hard by screw (21-28). Holders and supports are developed to change the distance between them.…”

Effect of Magnetic Field on the Physical and Chemical Properties of Flowing Lubricating Cooling Liquids Used in the Manufacturing Process

“…The magnetic field strength, magnetizing condition, and velocity of liquids were considered as three influential factors that affected the changes caused by the magnetic field [9,10]. Therefore, all of the experiments were conducted in the same laboratory conditions and the specification of the laboratory conditions is given in Table 1.…”