CAJ | 학술논문

应用CFD软件模拟分析流体在竖波纹管和竖直圆管内的降膜流动情况,采用立式蒸发式冷凝器试验平台,在不同喷淋密度下,测量温度和流量等参数,计算波纹管管内各相间传热传质系数,并与相同参数(流速、温度)条件下圆管管内传热传质系数进行比较.模拟结果表明,在相同的喷淋密度下,波纹管竖管内水膜分布较圆管均匀;试验结果表明,随着喷淋密度在一定范围内增加,水膜传热系数、空气水当量传热系数、总传热传质系数均增大,且波纹管的传热性能明显优于圆管.
응용CFD연건모의분석류체재수파문관화수직원관내적강막류동정황,채용입식증발식냉응기시험평태,재불동분림밀도하,측량온도화류량등삼수,계산파문관관내각상간전열전질계수,병여상동삼수(류속、온도)조건하원관관내전열전질계수진행비교.모의결과표명,재상동적분림밀도하,파문관수관내수막분포교원관균균;시험결과표명,수착분림밀도재일정범위내증가,수막전열계수、공기수당량전열계수、총전열전질계수균증대,차파문관적전열성능명현우우원관.
Falling film flow in vertical corrugated tube and circular tube was simulated by CFD software respectively,and a vertical evaporative condenser test platform was adopted to measure the temperature and flow rate under various spray densities.The heat and mass transfer coefficient of each phase interface inside corrugated tube was calculated based on the experimental data,and it was compared with that of inside circular tube under the same conditions.Simulation results indicate that at the same spray density,the water-film distribution in vertical corrugated tube is better than that of in circular tube.Experimental results show that with the increase of spray density in a certain range,the heat transfer coefficient of water-film,equivalent beat transfer coefficient of air-water and total heat and mass transfer coefficient increase.In addition,the heat transfer performance of corrugated tube is significantly better than that of circular tube.