华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (8): 55-60.

• 化学化工 • 上一篇    下一篇

来流速度分布对蒸发式冷凝器性能的影响

蒋翔 朱冬生 唐广栋 汪南   

  1. 华南理工大学 传热强化与过程节能教育部重点实验室,广东 广州 510640
  • 收稿日期:2005-08-24 出版日期:2006-08-25 发布日期:2006-08-25
  • 通信作者: 蒋翔(1977-),男,博士生,主要从事高效换热、蒸发式冷却及CFD模拟研究 E-mail:gzxjiang@163.com
  • 作者简介:蒋翔(1977-),男,博士生,主要从事高效换热、蒸发式冷却及CFD模拟研究
  • 基金资助:

    教育部新世纪人才支持计划(NCETIMO826);广东省自然科学基金重点项目(04105950);顺德区产学研项目(SK20030809)

Efect of Inlet-Air Velocity Distribution on Performance of Evaporative Condenser

Jiang Xiang  Zhu Dong-sheng  Tang Guang-dong  Wang Nan   

  1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-08-24 Online:2006-08-25 Published:2006-08-25
  • Contact: 蒋翔(1977-),男,博士生,主要从事高效换热、蒸发式冷却及CFD模拟研究 E-mail:gzxjiang@163.com
  • About author:蒋翔(1977-),男,博士生,主要从事高效换热、蒸发式冷却及CFD模拟研究
  • Supported by:

    教育部新世纪人才支持计划(NCETIMO826);广东省自然科学基金重点项目(04105950);顺德区产学研项目(SK20030809)

摘要: 在适当简化模型的基础上,采用可实现湍流动能一扩散率模型、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1.5~4.5 m/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°.

关键词: 蒸发式冷凝器, 来流速度分布, 传热, 传质, 流阻

Abstract:

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 κ-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 1 5%;(2)when the velocity of the inlet air ranges from 1.5 to 4.5 m/s,the deviation of heat transfer duty and the pres-sure 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 1 5.5%and 1 8.0%;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.

Key words: evaporative condenser, inlet-air velocity distribution, heat transfer, mass transfer, flow resistance