Practical Application of the Corresponding States Principle in Heat Transfer Engineering
TL;DR: In this article, the corresponding states principle (CSPP) generalization technique is used to provide the fluid flow system engineer and the heat exchanger designer with an additional tool that is simple, effective, and above all, more reliable in evaporator and condenser design practice than current conventional semiempirical correlations.
Abstract: Thermodynamic generalization methods based on reduced pressures proposed in the 1960s are reviewed and updated to reflect the current state of the art. These corresponding states principle (CSP) generalization techniques provide the fluid flow system engineer and the heat exchanger designer with an additional tool that is simple, effective, and above all, more reliable, particularly in evaporator and condenser design practice, than current conventional semiempirical correlations.
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TL;DR: In this paper, the universal functions (UF) of reduced pressure P+ = P/Pσ were used to evaluate the properties of 21 different substances (including thermodynamically similar as well as different chemical species, pure substances, and azeotropic mixtures) for two-phase flow and heat transfer analysis.
Abstract: The corresponding states principle (CSP) thermodynamic generalization methods described in [1] and references cited therein rest entirely on the empirical fact that key saturated liquid and vapor properties are universal functions (UFs) of reduced pressure P+ = P/Pσ This was highlighted in Figs. 2-4 of a recent paper in Heat Transfer Engineering [2]. However, these figures included only four to eight different substances, mostly common refrigerants, and were partially based on published physical properties dating back to the 1960s. The prime objective of the present communication is to document more thoroughly the extremely broad validity and accuracy of the UF (P+) that are most relevant in two-phase flow and heat transfer engineering analyses. For this purpose 21 different substances (including thermodynamically “similar” as well as “dissimilar” chemical species, pure substances, and azeotropic mixtures) are assessed on the basis of recent (1980s) thermophysical properties [3, 4] with the help of more p...
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01 Jan 1984
TL;DR: In this paper, the authors fitted experimental data for saturation nucleate pool boiling with a correlation of new simple type, using only reduced pressure, molecular weight and surface roughness, which made it easier to see the wood among the trees, and see where data are lacking or contradictory.
Abstract: Experimental data for saturation nucleate pool boiling are fitted with a correlation of new simple type, using only reduced pressure, molecular weight and surface roughness. The simplicity has great advantages, not only for practical application, but also for revealing the common basis of many existing correlations; for avoiding unprofitable lines of analysis, and for developing correlations which are more powerful without being intolerably complex. Applied to the analysis of a large amount of experimental data, this simple approach makes it easier to see the wood among the trees, and see where data are lacking or contradictory.
468 citations
Book•
01 Nov 1987
TL;DR: Physical Laws in Thermal Engineering Inviscid Fluid Mechanics Single-phase Newtonian Fluid mechanics Overview of Multiphase Fluid Flow Two-phase Fluid Flows Correlations Thermodynamic Generalization of FluidFlow Data Engineering Heat Transfer and Thermodynamics Practical Applications Non-equilibrium Thermodynamical Considerations Appendixes References Index as discussed by the authors
Abstract: Physical Laws in Thermal Engineering Inviscid Fluid Mechanics Single-phase Newtonian Fluid Mechanics Overview of Multiphase Fluid Flow Two-phase Fluid Flow Correlations Thermodynamic Generalization of Fluid Flow Data Engineering Heat Transfer and Thermodynamics Practical Applications Non-equilibrium Thermodynamic Considerations Appendixes References Index.
20 citations
TL;DR: In this article, the peak pool boiling heat flux can be interpreted as the product of a geometrical function (given by previous investigations), universal functions of the reduced saturation pressure, and the Pitzer acentric factor.
Abstract: The peak pool boiling heat flux can be nondimensionalized so the dimensionless peak heat flux is a function of a Bond or Laplace number that characterizes the system geometry. The dimensionless peak heat flux can be interpreted as the product of a geometrical function (given by previous investigations), universal functions of the reduced saturation pressure, and the Pitzer acentric factor. The latter universal functions are constructed by correlation. These are combined to give a single prediction of the peak heat flux that applies to all the common geometrical heater configurations. The probable error of the prediction, when it is compared with the available peak heat flux data, is 6.1 percent for substances whose dipole moment is not high. The method is also extended to create a comparable correlation for flow boiling burnout during crossflows over cylinders. There is a lack of data with which to check this correlation fully.
5 citations
02 Jun 1986
4 citations
TL;DR: In this article, the authors reviewed and updated thermodynamic generalizations based on reduced pressure proposed in the 1960s to reflect the current state of the art and illustrated the application of the method by analytical and numerical examples and an assessment made of its value in heat exchanger design practice with special emphasis on two-phase forced convection refrigeration cycle applications.
Abstract: Thermodynamic generalizations based on reduced pressure proposed in the 1960s are reviewed and updated to reflect the current state of the art. The application of the method is illustrated by analytical and numerical examples and an assessment made of its value in heat exchanger design practice with special emphasis on two-phase forced convection refrigeration cycle applications. It is shown that this thermodynamic approach provides the heat exchanger designer, and to some extent the system engineer with an additional tool which is simple, effective and above all more reliable, particularly in evaporator and condenser design practice, than current conventional semi-empirical correlations.
3 citations