CIESC Journal ›› 2012, Vol. 63 ›› Issue (8): 2341-2347.doi: 10.3969/j.issn.0438-1157.2012.08.002

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Dynamic measurement of thermophysical properties of molten salt and error correction method

  

  • Received:2012-01-09 Revised:2012-02-17 Online:2012-08-05 Published:2012-08-09
  • Supported by:

    the National Natural Science Foundation;the Fundamental Research Funds for the Central Universities

Abstract: As there are little data and measurement methods for the thermophysical properties of high temperature phase-change heat storage materials with molten salt at present, a dynamic measuring apparatus with Stefan model and Lamvik M model was designed to determine the thermophysical properties of high-temperature molten salt at the melting point based on the relationship between the speed of the moving phase-transition interface location and the thermophysical properties of the liquid-solid phase during the melting and solidification processes. An error correction method was put forward to correct test result by simulating the dynamic testing processes, and was numerically implemented by using User Defined Functions(UDFs). Some samples of sodium nitrate, potassium nitrate and zinc bromide with known thermophysical properties were measured and the results were corrected. Compared the experimental results and corrective results of thermal conductivity and thermal diffusivity of sodium nitrate and potassium nitrate with the values recommended in literature reference,both errors are less than 5%.The results of three molten salts show a significantly smaller error between the calculation and the test result after the correction than before the correction, and both the thermal conductivity confirming that the error correction method allows a significant reduction in the error arising from non-one-dimensional heat conduction and unstable temperature boundary conditions. Combining dynamic measurement with an error correction could reduce the requirements for testing devices. Meanwhile, this research could offer the basic data and theoretical foundation for further investigation of thermophysical properties of other high temperature molten salts. And the reliability of the method is experimentally confirmed.

Key words: molten salt, thermophysical properties, dynamic measurement, numerical simulation, error correction

CLC Number: 

  • O551.1
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