낮은 프란틀 수 유체 열전달 성능 정량화를 위한 불확실도 평가 방법론 개발

Abstract

In this study, an extended uncertainty evaluation methodology was developed by introducing explicit correction terms for these loss mechanisms and by incorporating a ΔT-dependent sensitivity model to address nonlinear error propagation under small temperature differences. The proposed procedure was validated using experimental data obtained from a counter-flow tubular heat exchanger operating with a liquid-metal and air pair. The expanded uncertainty of the net heat transfer rate was −5.69 % to +3.90 % on the hot side and ±10.58 % on the cold side, demonstrating good agreement with physically observed heat-loss behavior. The results confirm that the present methodology provides a physically consistent framework for quantifying experimental uncertainties in low-Prandtl-number thermal systems, and can serve as a standardized approach for future high-temperature liquid-metal heat transfer experiments.