초록 ▼

◦ 수직평판 강제대류 비등 열전달 실험 장치 제작 및 기초 실험 데이터 획득
- 수직평판 강제대류비등 열전달 시험부 및 강제대류 실험 루프 제작
- 2상유동 및 열전달 분포 동기화에 의한 강제대류 특성 측정 실험 수행
- 실험 결과 분석을 통한 물리 메커니즘 분석 연구방법 타당성 검증

◦ 과냉 강제대류비등 열전달 실험수행 및 결과 상세분석
- 다양한 조건(열유속, 과냉도, 유속)의 강제대류비등 열전달 및 임계열유속 실험 수행
- 실험결과 상세분석을 통한 물리 메커니즘 이해 및 역학적 상관식 제

◦ 수직평판 강제대류 비등 열전달 실험 장치 제작 및 기초 실험 데이터 획득
- 수직평판 강제대류비등 열전달 시험부 및 강제대류 실험 루프 제작
- 2상유동 및 열전달 분포 동기화에 의한 강제대류 특성 측정 실험 수행
- 실험 결과 분석을 통한 물리 메커니즘 분석 연구방법 타당성 검증

◦ 과냉 강제대류비등 열전달 실험수행 및 결과 상세분석
- 다양한 조건(열유속, 과냉도, 유속)의 강제대류비등 열전달 및 임계열유속 실험 수행
- 실험결과 상세분석을 통한 물리 메커니즘 이해 및 역학적 상관식 제안

◦ 실험결과와 전산수치해석 결과의 상호 비교를 통한 결과 개선
- 국소건도 측정 장치 설치 및 실험 수행
- 상용 전산해석코드(CUPID 코드 포함)를 이용한 강제대류 비등열전달 분석 수행
- 건도 측정 실험결과와 전산해석결과의 비교를 통한 제안 메커니즘 평가 및 보완

Abstract ▼

This study aims to perform a synchronized, high-resolution visualization and measurement of two-phase flow and local heat transfer during subcooled convective flow boiling, to analyze the measured data based on the fundamental physical parameters associated with boiling, and finally to understand th

This study aims to perform a synchronized, high-resolution visualization and measurement of two-phase flow and local heat transfer during subcooled convective flow boiling, to analyze the measured data based on the fundamental physical parameters associated with boiling, and finally to understand the exact physical mechanism, which will be used for validation and improvement of the high-fidelity computational thermal-hydraulic analysis code.

◆ Construct subcooled forced flow boiling heat transfer experiments and detailed analysis of the obtained data
Test section and flow loop for subcooled forced flow boiling heat transfer experiments on vertical heated plate was conducted. Experimental techniques to measure the two-phase and heat transfer were temporally and spatially synchronized and the heat flux partitioning were conducted with the obtained experimental data. The feasibility of the research methodology was verified.

◆ Perform subcooled forced flow boiling heat transfer experiments and detailed analysis of the obtained data
Experiments for subcooled flow boiling heat transfer and CHF were conducted with high spatial and temporal resolution under various flow rate, subcooling, and heat flux conditions. The detailed analysis of the obtained experimental data reflecting the physical phenomena such as bubble sliding and merging were performed. Based on the wall boiling heat flux partitioning model, the effects of flow rate, subcooling, and heat flux on subcooled flow boiling heat transfer were investigated.

◆ Improve the proposed mechanism through the mutual comparison of the experimental measurement and numerical analysis data
The physical mechanism and wall heat flux partitioning model for subcooled flow boiling based on the detailed analysis of the experimental data and was suggested. The proposed model was applied to computation fluid dynamic code using user defined function and boiling heat transfer simulation were performed. The void fraction measurement system was installed at outlet of test section and the experiment to measure the local void fraction were conducted. The proposed model for wall heat flux partitioning was evaluated and improved by comparing the results between experiment and simulation.