CAJ | 학술논문

利用高速摄像仪记录有、无超声波时注入过冷水中蒸汽气泡的凝结过程，以分析超声波对蒸汽气泡凝结过程及传热特性的影响。结果表明：在超声波场中，蒸汽气泡表面会形成晶格状毛细波，有效增加气泡表面积，并加强气泡周围流体热边界层扰动，从而导致凝结换热的强化及气泡凝结速度加快。基于15～60 K过冷度下，有、无超声波时较大蒸汽气泡凝结的实验数据，拟合得出有、无超声波时的气泡凝结换热经验关联式，预测误差在±30%以内。
이용고속섭상의기록유、무초성파시주입과랭수중증기기포적응결과정，이분석초성파대증기기포응결과정급전열특성적영향。결과표명：재초성파장중，증기기포표면회형성정격상모세파，유효증가기포표면적，병가강기포주위류체열변계층우동，종이도치응결환열적강화급기포응결속도가쾌。기우15～60 K과랭도하，유、무초성파시교대증기기포응결적실험수거，의합득출유、무초성파시적기포응결환열경험관련식，예측오차재±30%이내。
Condensation processes of vapor bubbles being injected into subcooled water with and without ultrasonic vibration were recorded by a high-speed video camera to analyze the effects of ultrasonic field on the condensation process and heat transfer of vapor bubbles. Experimental results indicated that the lattice shaped capillary wave formed on the bubble surface increased the condensation heat transfer area greatly and intensified the turbulence in the thermal boundary layer around the vapor bubble, enhancing condensation heat transfer and accelerating bubble condensation in the ultrasonic field. Based on experimental data of relatively large vapor bubbles at liquid subcooling of 15—60 K, empirical correlations were obtained for predicting the condensation heat transfer of vapor bubbles with and without ultrasonic, with deviations within±30%.