摘要
综合应用体积多孔度、表面渗透度和分布阻力方法建立了适用于准连续介质的N S修正控制方程 .用改进的k ε模型考虑管束对湍流的产生和耗散的影响 ,用壁面函数法处理壳壁和折流板的壁面效应 ,对一管壳式换热器的壳侧湍流流动与换热进行了三维数值模拟 .对计算结果进行了归纳 ,并与换热器冷态实验、前人的研究结果进行了对比分析 ,从而证明了该方法能更有效地模拟管壳式换热器壳侧的流动特性 ,压降实验数据和计算结果符合良好 .
A three-dimensional, staggered grid, full-implicit consistent control-volume numerical model was presented for the analysis of turbulence fluid flow and heat transfer in the shell side of shell-and-tube heat exchanger. The numerical model used the distributed resistance method along with the concept of volumetric porosities, surface permeabilities to account for the presence of tubes in the heat exchangers. A modified k-Ε model was used to account for the effects of tubes on turbulence generation and dissipation. Shell and baffle walls were modeled by using the wall function approach. The three-dimensional model was validated by comparison of the computed pressure drop distribution with experiment data obtained on an E shell type heat exchanger model and the previous research results. Good agreement between the simulation results and experimental data is obtained. It showed that the three-dimensional numerical model could more effectively simulate the flow characteristics in the shell-side of heat exchanger than the previous numerical simulation models.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第7期1053-1059,共7页
CIESC Journal
基金
国家自然科学基金项目 (No 5 0 0 760 3 4)
国家重点基础研究发展规划项目 (No G2 0 0 0 0 2 63 0 3 )共同资助~~
关键词
管壳式换热器
多孔介质
湍流流动与换热
数值模拟
Computer simulation
Heat transfer
Mechanical permeability
Porous materials
Pressure drop
Three dimensional
Turbulent flow
