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Rabas and Taborek correlation, for heat transfer in banks of low fin tubes, Rackett equation (modified) for liquid density Radiation: Radiation shields, in radiation heat transfer, Radiation source analysis, Radiative heat transfer: Radiators, automotive, construction, Radiometers, application in gas radiation property measurement, Radiosity, Stephan's law for, Radiosity-irradiation formulations in radiative heat transfer, Rankine cycle in refrigeration, Rao, B K Raoult's law for partial pressure, Rating of heat exchangers, Rayleigh instability, in free convection, Rayleigh number Reay, D Reboilers: Reciprocal mode integrating sphere, for reflection and transmission measurements in radiation, Rectangles: Rectangular ducts: Rectangular enclosures, free convective heat transfer in: Rectangular fins, for plate fin exchangers Reduced pressure, correlations for pool boiling using, Reference temperature: Refinery processes, fouling in, Reflection, of thermal radiation, from solid surfaces: Reflectivity, of solid surfaces, Reflectometer, heated cavity, Reflux condensers, Refractories, density of, Refractory surfaces, Refrigerants: Refrigerant 11 (Trichlorofluoromethane): Refrigerant 12 (Dichlorodifluoromethane): Refrigerant 13 (Chlorotrifluoromethane): Refrigerant 21 (Dichlorofluoromethane): Refrigerant 22 (Chlorodifluoromethane): Refrigerant 116: Refrigerant plant, entropy generation in, Refrigeration, heat transfer in, Regenerators and thermal energy storage, Regimes of heat transfer, in ducts, single phase flow, Reidel method, for predicting enthalpy of vaporisation, Reinforcing rings, for expansion bellows, Relaminarization, of turbulent flow, Reichenberg method, for effect of pressure on gas viscosity, Relief system design for shell-and-tube heat exchangers with tube side failure, Removal of fouling deposits: Renewable fuels, properties of, Renotherm, heat transfer medium, Repair, of expansion bellows, Residence times, in dryers: Resistance network analysis, Resistance (thermal) due to fouling: Reversible (minimum) work, in Reynolds number, Reynolds stress models, for turbulence, Rheologically complex materials, properties of: Rheological properties of drag reducing agents Rheology, shear flow experiments used in, Rhine, J M, Ribatski, G, Riblets for drag reduction, Richardson number, Richie, J M, Ring cells, in free convection, RODbaffles, in tube bundles with longitudinal flow, Rod bundles: Rohsenow correlation, for nucleate boiling, Roll cells, in free convection, Roller expansion, of tubes into tube sheets, Rose, J W, Rossby number, Rotary dryer, Rotating drums, heat transfer to particle bed in, Rotating surface, in an annular duct Rotation, as device for heat transfer augmentation, Roughness, surface: Rough walled passages, radiative heat transfer down, Rubber (sponge) balls, in fouling mitigation, Ryznar index for water quality,
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Properties of Saturated Fluids

DOI 10.1615/hedhme.a.000524

5.5 PHYSICAL PROPERTY DATA TABLES
5.5.1 Properties of saturated fluids

In this section the thermophysical properties of fluids are presented for the two-phase region — that is to say, from the normal boiling point to the critical point. Data are presented wherever possible from internationally recognised sources. THERMODYNAMIC PROPERTIES are often available from an equation of state representing the PVT behaviour of the fluid, and provide a consistent set of interdependent values. Typical compounds are those listed in Section 525. Data for the properties at the saturation temperature can be derived from theoretical relationships. More usually, however, the ideal gas heat capacity and properties of the saturated liquid below the boiling point are taken from the literature and correlated by methods referred to in Section 5.1 (Tables in Section 533 and Section 534) provide data values for a randomly chosen list of compounds.

The most generally reliable procedure for obtaining data for the saturated vapour is by the Lee-Kesler generalised equation of state (Lee and Kesler, 1975). The latent heat of vaporisation can be predicted reliably by the Clausius-Clapeyron equation when good vapour pressure and density data are available (Section 500-4). The liquid enthalpy can then be evaluated at pressures above the normal boiling point by difference from the vapour enthalpy. This is represented graphically in Figure 1. This is the method preferred in this revision as it provides a common basis for estimating mixture data. When liquid enthalpies can be derived by integration of the specific heat capacity they are less reliable at temperatures above the normal boiling point.

Figure 1 Temperature-enthalpy diagram

The TRANSPORT PROPERTIES of many important fluids have been similarly studied, and all such known sources have been consulted. (See Section 537 for specific examples). The properties of liquids can be measured relatively easily, and are well established for many fluids up to temperatures of 0.9Tc. For the saturated vapour, however, few reliable measurements have been made because of inherent experimental difficulties. The generalised procedures of Thodos and co-workers (Jossi et al., 1962; Stiel and Thodos, 1964a; Stiel and Thodos, 1964b) have been used to derive values for the saturated vapour from ideal gas data, using density as the independent variable. Figures on pp. 25 and 27 of Section 526 illustrate the effect of pressure on the properties of steam.

A thorough survey of the liquid viscosity and thermal conductivity of groups of compounds in homologous series has been made by the Engineering Sciences Data Unit over a number of years, and these are used whenever possible. The authors recommend that their equations should not be extrapolated beyond a reduced temperature of 0.9; the tables are therefore limited; in particular liquid thermal conductivity will increase towards the critical point at higher temperatures.

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