Xiufang Zhao , Xian Wang , Xueqiang Dong , Yunxiao Wang , Yanxing Zhao , Bowen Sheng , Maoqiong Gong
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引用次数: 0
摘要
本研究设计了一种基于瞬态热线法(THW)的仪器,用于测量温度范围为 20-300 K、压力范围为 0-20 MPa 的低温流体的导热系数,相对扩展不确定度 Ur(λ) 为 0.0284 (k = 2, 95 %)。甲烷、乙烷和二氧化碳的实验数据与 ECS 模型显示出良好的一致性,验证了仪器的可靠性。除了 70 K 以上热线电阻的线性温度依赖性之外,还校准了 70 K 以下的非线性温度依赖性,验证了 THW 方法在 20-70 K 温度范围内测量的可行性。测量过程中热线的温升与模拟计算结果吻合。此外,还建立了一个高达 600 K 的氦气热导率模型。这项工作中提供的数据以及之前公布的数据与模型计算结果非常吻合,平均绝对相对偏差 (AARD) 为 1.46%。
A new transient hot-wire thermal conductivity apparatus and measurements of helium at temperatures from 20 K to 300 K
In this study, an apparatus based on the transient hot-wire method (THW) was designed to measure the thermal conductivity of cryogenic fluid within the temperature range of 20–300 K and the pressure range of 0–20 MPa, with a relative expanded uncertainty Ur(λ) of 0.0284 (k = 2, 95 %). The experimental data of methane, ethane, and carbon dioxide showed good consistency with the ECS model, validating the reliability of the apparatus. In addition to the linear temperature dependence of hot-wire resistance above 70 K, the nonlinear temperature dependence below 70 K is calibrated, and the feasibility of the THW method for measurements in the temperature range of 20–70 K is validated. Subsequently, the thermal conductivity data for helium are presented from 20 to 300 K. The temperature rises of hot-wire during the measurement agreed well with the simulation calculation results. Furthermore, a thermal conductivity model for helium gas up to 600 K was developed. The presented data in this work, as well as previously published data, demonstrated good agreement with the model calculation results, with an average absolute relative deviation (AARD) of 1.46 %.
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