PREDICTION OF TRANSPORT PROPERTIES RELATED TO HEAT TRANSFER

1982 ◽  
Author(s):  
Joseph Kestin
Keyword(s):  
Heat Transfer ◽  
Transport Properties

Prediction of Local and Integral Turbulent Transport Properties for Liquid-Metal Heat Transfer in Equilateral Triangular Rod Arrays

1975 ◽  
Vol 97 (2) ◽  
pp. 238-243 ◽  
Author(s):  
H. Ramm ◽  
K. Johannsen
Keyword(s):  
Heat Transfer ◽  
Liquid Metal ◽  
Transport Properties ◽  
Turbulence Model ◽  
Transfer Problem ◽  
Turbulent Transport ◽  
Three Dimensional ◽  
Theoretical Method ◽  
Eddy Diffusivity ◽  
Thermal Mixing

A theoretical method based on a phenomenological turbulence model has been applied to evaluate turbulent transport properties for liquid-metal heat transfer in bare equilateral triangular rod bundles. Results obtained for local distributions of thermal eddy diffusivity in the various directions are presented in terms of correlations. From a subsequent solution of the three-dimensional heat transfer problem between two characteristic interior subchannels under conditions characteristic for tracer-type mixing experiments, integral thermal mixing coefficients and thermal length scales have been evaluated. Results demonstrate that the basic concept of subchannel analysis treating molecular conduction and turbulent transport independently of each other tends to underestimate intersubchannel transport. The uncertainties which are involved in principal assumptions of the turbulence-model as well as in the available empirical results are discussed in some detail.

Thermal and Transport Properties of NaCl–KCl–ZnCl2 Eutectic Salts for New Generation High-Temperature Heat-Transfer Fluids

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Peiwen Li ◽  
Edgar Molina ◽  
Kai Wang ◽  
Xiankun Xu ◽  
Ghazal Dehghani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Transport Properties ◽  
Thermal Power ◽  
Engineering Application ◽  
Heat Transfer Fluid ◽  
Heat Of Fusion ◽  
Temperature Heat ◽  
New Generation ◽  
Halide Salts

Three eutectic salts from a system of halide salts NaCl–KCl–ZnCl2 were chosen for detailed study of thermal and transport properties with the objective of developing a next generation high-temperature heat-transfer fluid (HTF) for concentrated solar thermal power (CSP) technology. The acceptable range of the working temperatures for the HTF is from below 250 °C to at least 800 °C. The tested properties are presented here for the three candidate eutectic salts, including melting point, heat of fusion, heat capacity, vapor pressure, viscosity, density, and thermal conductivity. Data-fitted equations are provided for all the measured properties for convenience in engineering application. It is concluded that the three eutectic salts can satisfy the needs for a high-temperature HTF and thus are recommended as a new generation high-temperature HTF.

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