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Volume 36 Issue 1
Jan 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(1): 013301.
CHENG Zhikang, ZHANG Qing, LIU Xun, WU Ye, HUANG Haijun. Pressure and Temperature Calibrations of End-Loaded Piston-Cylinder 19 mm Outer Diameter Sample Assembly[J]. Chinese Journal of High Pressure Physics, 2022, 36(1): 013301. doi: 10.11858/gywlxb.20210802
Citation: CHENG Zhikang, ZHANG Qing, LIU Xun, WU Ye, HUANG Haijun. Pressure and Temperature Calibrations of End-Loaded Piston-Cylinder 19 mm Outer Diameter Sample Assembly[J]. Chinese Journal of High Pressure Physics, 2022, 36(1): 013301. doi: 10.11858/gywlxb.20210802
shu

Pressure and Temperature Calibrations of End-Loaded Piston-Cylinder 19 mm Outer Diameter Sample Assembly

doi: 10.11858/gywlxb.20210802

  • School of Science, Wuhan University of Technology, Wuhan 430070, Hubei, China

  • Received Date: 24 May 2021
  • Rev Recd Date: 11 Jun 2021
    Abstract
  • In the high-temperature and high-pressure experiments, it is essential to know the pressure and temperature of sample as well as the temperature distribution inside sample chamber. Therefore, it is necessary to calibrate the pressure and temperature of the experimental assembly before using the high-temperature and high-pressure experimental device. Here we carried out the pressure and temperature calibrations experiments on 19 mm outer diameter sample assembly of the end-loaded piston-cylinder apparatus. We calibrated the pressure of sample chamber by using the melting curve of sodium chloride (NaCl) under high pressure. When the oil pressure of the oil cylinder drops significantly, the NaCl in the sample chamber melts; according to the temperature measured by the thermocouple at this time and the comparison of the melting curve of NaCl under high pressure published by the predecessors, the real pressure in the sample chamber was determined. The pressure calibration results show that there is a linear relationship between the real pressure and the nominal pressure. The double thermocouple method was used to measure the temperature in the center and upper part of the 19 mm outer diameter sample assembly chamber. It was found that the temperature in the center of the sample chamber was higher than the temperature in the upper part of the sample chamber. In addition, the temperature gradient in the sample chamber increases with increasing temperature and decreases with increasing pressure. The temperature gradient in the sample chamber during the second stage pressurization and heating is higher than the temperature gradient in the sample chamber of the first stage pressurization and heating experiment. The pressure and temperature calibration results obtained in this study are of reference value and guiding significance for future high-temperature and high-pressure experimental study using 19 mm outer diameter sample assembly.

     

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