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首页> 外文期刊>International Journal of Thermophysics >Numerical and Experimental Study of the Hydrostatic Pressure Correction in Gas Thermometry: A Case in the SPRIGT
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Numerical and Experimental Study of the Hydrostatic Pressure Correction in Gas Thermometry: A Case in the SPRIGT

机译：气体温度测压静压压力校正的数值和实验研究：闪闪发光的情况

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摘要

Single-pressure refractive index gas thermometry (SPRIGT) is a new type of primary thermometry, which needs an extremely stable working pressure (stability < 4 ppm). In practice, the pressure control system at room temperature is located above the cold resonator at 5 K to 25 K, and a long pressure tube is used to connect them, which entails a hydrostatic pressure correction (HPC). To this end, a three-dimensional (3D) Computational Fluid Dynamics (CFD) simulation model of the pressure tube has been developed and compared with experimental results. First, to verify the simulation results, the helium-4 gas pressure in the center of the resonator was measured using a determination of the refractive index by microwave resonance coupled with the knowledge of the temperature. Results of simulation and experiment showed good agreement. Thereafter, based on this CFD simulation, the non-linear temperature distribution in the vertical pressure tube and the uncertainty caused by this non-linear phenomenon were calculated. After this, the validity of the isothermal assumption to simplify the calculation of the HPC was verified. Finally, the effect of heating on the pressure was studied and its impact found to be negligible. To the best of our knowledge, this is the first time experimental and simulation results have been compared for the HPC. The results are expected to be more generally applicable to the accurate determination of pressure in cryostats.
机译：单压折射率气体温度测温（Sprigt）是一种新型的初级温度，需要极其稳定的工作压力（稳定性<4ppm）。实际上，室温下的压力控制系统位于5 k至25k的冷谐振器上方，并且使用长压管连接它们，这需要静压压力校正（HPC）。为此，已经开发并将压力管的三维（3D）计算流体动力学（CFD）仿真模型与实验结果进行了比较。首先，为了验证仿真结果，使用微波谐振的测定与温度的知识相结合，测量谐振器中心中的氦-4气压。仿真和实验结果表明良好的一致性。此后，基于该CFD仿真，计算垂直压力管中的非线性温度分布和由该非线性现象引起的不确定性。此后，验证了等温假设简化计算HPC的计算的有效性。最后，研究了加热对压力的影响，并发现其影响可忽略不计。据我们所知，这是第一次对HPC进行了实验和仿真结果。结果预计更普遍适用于准确测定低温恒温器的压力。

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