Measurement of local wall temperature and heat flux using the two-thermocouple method for a heat transfer tube

Taehwan Ahn; Jinhoon Kang; Jae Jun Jeong; Byongjo Yun

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Measurement of local wall temperature and heat flux using the two-thermocouple method for a heat transfer tube

机译：传热管的双热电偶法测量局部壁温和热通量

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The two-thermocouple method was investigated experimentally to evaluate its accuracy for the measurement of local wall temperature and heat flux on a heat transfer tube with an electric heater rod installed in an annulus channel. This work revealed that a thermocouple flush-mounted in a surface groove serves as a good reference method for the accurate measurement of the wall temperature, whereas two thermocouples installed at different depths in the tube wall yield large bias errors in the calculation of local heat flux and wall temperature. These errors result from conductive and convective changes due to the fin effect of the thermocouple sheath. To eliminate the bias errors, we proposed a calibration method based on both the local heat flux and Reynolds number of the cooling water. The calibration method was validated with the measurement of local heat flux and wall temperature against experimental data obtained for single-phase convection and two-phase condensation flows inside the tube. In the manuscript, Section 1 introduces the importance of local heat flux and wall temperature measurement, Section 2 explains the experimental setup, and Section 3 provides the measured data, causes of measurement errors, and the developed calibration method.

机译：实验研究了二热电偶方法，以评估其在带环形通道的电热棒上的传热管上测量局部壁温和热通量的准确性。这项工作表明，齐平安装在表面凹槽中的热电偶是准确测量壁温的良好参考方法，而两个安装在管壁不同深度的热电偶在计算局部热通量时会产生较大的偏差误差和壁温。这些误差是由于热电偶护套的鳍片效应引起的传导和对流变化而引起的。为了消除偏差，我们提出了一种基于冷却水的局部热通量和雷诺数的标定方法。该校准方法通过根据管内单相对流和两相冷凝流获得的实验数据，通过测量局部热通量和壁温来验证。在手稿中，第1节介绍了局部热通量和壁温测量的重要性，第2节介绍了实验设置，第3节提供了测量数据，测量错误的原因以及已开发的校准方法。

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《Nuclear engineering and technology》 |2019年第7期|共7页
作者
Taehwan Ahn; Jinhoon Kang; Jae Jun Jeong; Byongjo Yun;
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中图分类原子能技术;
关键词
Local measurementThermocoupleHeat fluxWall temperatureCondensationCalibration;

机译：本地测量热电偶热通量壁温冷凝校准;

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1. Local heat transfer coefficient during stratified flow in large, flattened- tube steam condensers with non-uniform heat flux and wall temperature [J] . Davies William A. III, Hrnjak Pega International Journal of Heat and Mass Transfer . 2020,第Jana期

机译：具有不均匀热通量和壁温的大型扁平管式蒸汽冷凝器在分层流动过程中的局部传热系数
2. Numerical investigation of heat transfer in a micro-porous-channel under variable wall heat flux and variable wall temperature boundary conditions using local thermal non-equilibrium model with internal heat generation [J] . K.N. Seetharamu, V. Leela, Nagabhushanam Kotloni International Journal of Heat and Mass Transfer . 2017,第sepa期

机译：壁热通量和壁温边界变化条件下微孔通道内传热的局部热非平衡模型研究
3. Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes [J] . Andrzej Kowal, Dawid Taler, Jan Taler Archives of Thermodynamics . 2011,第1期

机译：水冷壁管中吸收热通量和水侧传热系数的测量
4. Measurements of the convection heat transfer coefficient for a two-dimensional wall jet: uniform temperature and uniform heat flux boundary conditions [C] . R. S. AbdulNour, K. Willenborg, J. J. McGrath, ASME Internationnal Mechanical Engineering Congress and Exposition . 1997

机译：二维壁射流对流传热系数的测量：均匀的温度和均匀的热通量边界条件
5. THE EXPERIMENTAL DETERMINATION OF THE LOCAL AND AVERAGE HEAT TRANSFER CHARACTERISTICS AND AVERAGE FRICTION COEFFICIENTS FOR TURBULENT FLOW OF AIR AND ARGON WITH VARIABLE PROPERTIES IN SMOOTH TUBES WITH THE BOUNDARY CONDITIONS OF CONSTANT WALL TEMPERATURE HEATING AND INCREASING HEAT FLUX HEATING. [D] . PRIDEAUX, JEAN PAUL. 1966

机译：具有恒定壁温加热和增加热通量边界条件的光滑管中具有可变特性的空气和氩气湍流的局部和平均传热特性的试验摩擦系数和平均摩擦系数。
6. Local data of heat flux wall temperature and the void phase along the boiling curve during vertical subcooled flow boiling of refrigerant Novec 649 at a copper wall [O] . Moritz Bruder, Ludwig Sembach, Veronika Krumova, 2018

机译：制冷剂Novec 649在铜壁上的垂直过冷流动沸腾过程中沿沸腾曲线的热通量壁温和空隙相的局部数据
7. Discussion: “Wall Temperature and Heat Flux Measurement in a Round Tube” (Morgan, Jr., A. I., and Carlson, Robert A., 1961, ASME J. Heat Transfer, 83, pp. 105–109) [O] . E. M. Sparrow 1961

机译：讨论：“圆形管中的壁式温度和热通量测量”（Morgan，Jr.，A.I.，和Carlson，Robert A.，1961，Asme J.传热，83，PP。105-109）
8. HEAT TRANSFER TO LAMINAR NON-NEWTONIAN FLOW IN A CIRCULAR TUBE WITH VARIABLE CIRCUMFERENTIAL WALL TEMPERATURE OR HEAT FLUX [R] . Robert M. Inman 1965

机译：具有可变环壁温度或热通量的圆管内的层流非牛顿流动的传热

Measurement of local wall temperature and heat flux using the two-thermocouple method for a heat transfer tube

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