Evaluation of thermocouple fin effect in cladding surface temperature measurement during film boiling.
スポンサーリンク
概要
- 論文の詳細を見る
Thermocouple fin effect on surface temperature measurement of a fuel rod has been studied at elevated wall temperatures under film boiling condition in a reactivity initiated accident (RIA) situation. This paper presents an analytical equation to evaluate temperature drops caused by the thermocouple wires attached to cladding surface. The equation yielded the local temperature drop at measuring point depending on thermocouple diameter, cladding temperature, coolant flow condition and vapor film thickness. The temperature drops by the evaluating equation were shown in cases of free and forced convection conditions. The analytical results were compared with the measured data for various thermocouple sizes, and also with the estimated maximum cladding temperature based on the oxidation layer thickness in the cladding outer surface.<BR>It was concluded that the temperature drops at above 1, 000°C in cladding temperature were around 120 and 150°C for 0.2 and 0.3 mm diameter Pt-Pt•Rh thermocouples, respectively, under a stagnant coolant condition. The fin effect increases with the decrease of vapor film thickness such as under forced flow cooling or at near the quenching point.
- 一般社団法人 日本原子力学会の論文
著者
-
Tsuruta Takaharu
Department Of Mechanical Engineering Kyushu Institute Of Technology
-
FUJISHIRO Toshio
Department of Fuel Safety Research, Japan Atomic Energy Research Institute
関連論文
- Critical Heat Flux Prediction of Subcooled Pool Boiling Based on the Microlayer Model
- DSMC Analysis of Interface Mass Transfer in Evaporation/Condensation Based on Molecular Dynamics Study
- Effects of Solid Heating Surfaces on Nanometer-Sized Liquid Films
- TED-AJ03-196 EFFECT OF NON-CONDENSABLE GAS ON EXPERIMENTAL VALUE OF CONDENSATION COEFFICIENT
- Prediction of Bubble Behavior in Subcooled Pool Boiling Based on Microlayer Model(Pool Boiling)
- Effect of Noncondensable Gas on Experimental Condensation Coefficient(Emerging Fields in Thermal Engineering)
- Inverted Temperature Profile at Liquid-Vapor Interface Based on Nonequilibrium Molecular Dynamics Simulation
- D305 MOLECULAR DYNAMICS STUDY AND TRANSITION STATE THEORY ON CONDENSATION COEFFICIENT(Molecular dynamics)
- Conjugated Heat Transfer on a Horizontal Surface Impinged by Circular Free-Surface Liquid Jet(Heat and Mass Transfer)
- Critical Heat Flux of Boiling Heat Transfer in a Confined Space
- Buoyant Plume through a Permeable Porous Layer Located above a Line Heat Source in an Infinite Fluid Space
- Buoyancy-Driven Channelling Flow in Vertical Porous Layer
- Transient Condensing Two-Phase Flow Through an Initially Subcooled Porous Medium
- Estimation of Condensation Coefficient from Dropwise Condensation Heat Transfer
- Evaluation of thermocouple fin effect in cladding surface temperature measurement during film boiling.