CAJ | 학술논문

为进一步优化换热面结构、提高换热器效率并防止传热恶化现象的发生,应用可视化方法以R113为工质,对水平矩形通道内临界热流密度的触发、扩散进行了系统的实验研究。在总结众多临界热流密度机理模型的基础上,通过实验数据与相关模型的对比分析,发现界面分离模型是众多模型理论中较为合理并与可视化实验结果最为相符的机理模型。通过研究发现壁面传热恶化区域的扩散主要受加热面液膜相互合并使其覆盖面积不断增大的影响,换热表面上的肋结构与缝结构都能有效限制传热恶化区域的扩散,提高换热器使用的安全性。
위진일보우화환열면결구、제고환열기효솔병방지전열악화현상적발생,응용가시화방법이R113위공질,대수평구형통도내림계열류밀도적촉발、확산진행료계통적실험연구。재총결음다림계열류밀도궤리모형적기출상,통과실험수거여상관모형적대비분석,발현계면분리모형시음다모형이론중교위합리병여가시화실험결과최위상부적궤리모형。통과연구발현벽면전열악화구역적확산주요수가열면액막상호합병사기복개면적불단증대적영향,환열표면상적륵결구여봉결구도능유효한제전열악화구역적확산,제고환열기사용적안전성。
Flow boiling of R113 in a rectangular channel was investigated to explore the conditions leading to critical heat flux（CHF）,and the result was also useful to the optimization of heat transfer surface design and the prevention of heat transfer deterioration.The analysis of flow visualization data proved that the theoretical model of CHF for subcooled flow boiling is consistent with the interfacial lift-off mechanism.The enlargement of the heat transfer deterioration area on the heating wall mainly depends on vapor film coalescence and the increasing area of coverage by vapor films.Rib and gap structures on the heating surface can effectively reduce the heat transfer deterioration and improve the operation safety of heat exchangers.