摘要
在适当简化模型的基础上,采用可实现湍流动能-扩散率模型、强化壁面处理方法和速度-压力耦合的SIMPLE算法,探索了来流速度分布及其对传热传质与流阻性能的影响.结果表明:计算流体力学模拟与实验偏差不超过15%;当来流速度在1.5~4.5m/s范围内时。排热量变化率为19.3%,压降变化率为9.4%;当来流进入角在-45°~45°时,排热量变化率为15.5%,压降变化率为18.0%;合适的气流入口流速为2.4~3.3m/s.适宜方向为-15°-20°.
This paper investigates the inlet-air velocity distribution and its influence on the heat and mass transfer as well as the flow resistance by reasonably predigesting the physical model. In the investigation, the realizable k-ε model, the enhanced wall treatment and the SIMPLE arithmetic for the velocity-pressure coupling are adopted. The results indicate that ( 1 ) the error between the simulated and experimental results is within the range of 15% ; (2) when the velocity of the inlet air ranges from 1.5 to 4.5m/s, the deviation of heat transfer duty and the pressure drop reach 19.3% and 9.4%, respectively; (3) when the velocity angle of the inlet air ranges from -45° to 45° the deviation of heat transfer duty and the pressure drop respectively reach 15.5% and 18.0% ; and (4) the optimal velocity and velocity angle of the inlet air are 2.4 to 3.3 m/s and -15°to 20° respectively.
出处
《华南理工大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2006年第8期55-60,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
教育部新世纪人才支持计划(NCET040826)
广东省自然科学基金重点项目(04105950)
顺德区产学研项目(SK20030809)
关键词
蒸发式冷凝器
来流速度分布
传热
传质
流阻
evaporative condenser
inlet-air velocity distribution
heat transfer
mass transfer
flow resistance