摘要
提出了一种强化管壳式换热器壳侧传热的螺旋折流片式换热器新方案,该方案在部分管子上套上螺旋折流片,不仅强化传热,而且对相邻管子形成支撑;利用FLUENT流体计算软件对同心套管螺旋折流片式换热段的壳侧流场、温度场进行了数值模拟,并讨论了螺旋角对其强化传热和阻力性能的影响。结果显示螺旋折流片诱导的涡旋流动对于减薄边界层,促进近壁流体与主流区流体的动量和质量交换进而强化传热有明显的作用,传热系数可比光管提高约40％-100％,但其流动阻力也将增大。
A novel coil-strip-baffle structure used for heat transfer enhancement in the shell side of a tube-shell heat exchanger is presented, which sleeves some tubes of a heat exchanger with coil-strips to enhance heat transfer in the shell side and to support their adjacent tubes. The flow and temperature fields in a coil-strip-baffled concentric channel are simulated using FLUENT software. Also the effect of the helical angle of the coil-strip-baffle on heat transfer and flow resistant of the heat exchanger is analyzed. The results show that this new structure may raise the heat transfer coefficient up to the range of 40% to 100% in comparison with bare tube one; meanwhile, higher flow resistance is also existed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第2期310-312,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划项目(No.G2000026303)国家自然科学基金资助项目(No.50176008)东南大学"211"
"985"工程项目资助
