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A new method to compute the proper radiant heat transfer correction of bare-wire thermocouple measurements

机译：一种计算裸线热电偶测量适当辐射传热校正的新方法

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摘要

The proper consideration of the radiation correction for bare-wire thermocouple measurements requires consideration of the convective and radiative heat transfer of the thermocouple with its surroundings, as well as conductive heat transfer between the thermocouple bead and the connecting thermocouple wires. This has rarely been considered in the past, and to do so has involved complex simulation of the complete thermocouple energy balance. This paper reports on a new, easy-to-implement approach for calculating the proper radiant correction for thermocouples, subject to uncertainties associated with the relevant thermocouple and gas properties and limitations to characterizing convective heat transfer to the thermocouple bead and wires via standard correlations. Examples of the radiation correction computed with this new method as a function of temperature and bead and wire size are given, and are compared with traditional approaches considering heat transfer around either the thermocouple bead or the thermocouple wire.
机译：对裸线热电偶测量的辐射校正的正确考虑需要考虑热电偶与周围环境的对流和辐射传热，以及热电偶珠和连接热电偶线之间的导电传热。这已经很少被认为是过去的，并且这样做涉及复杂的完整热电偶能量平衡模拟。本文报告了一种用于计算热电偶的适当辐射校正的新的，易于实现的方法，这受通过了与相关热电偶和气体特性相关的不确定性以及通过标准相关性地表征对热电偶珠和线的对流热传递的限制。给出了用这种新方法计算的辐射校正作为温度和珠子和线尺寸的函数的辐射校正，并与考虑热电偶珠粒或热电偶线的热传递的传统方法进行比较。

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