螺旋管内天然气冷凝流动传热数值模拟
Numerical Simulation of Natural Gas Condensation Flow and Heat Transfer in Spiral Tube
李畅 1李文亮 1曹传超 1张静1
作者信息
- 1. 中国船舶集团有限公司第七一一研究所能源装备事业部,上海 201108
- 折叠
摘要
针对螺旋管内天然气混合工质冷凝过程,在Lee模型的基础上,引入温度滑移因子,提出一种变温相变新模型,分别用新模型和Lee模型进行不同压力工况下的冷凝流动换热模拟.结果表明,新模型计算得到的温度沿流动方向下降很明显,反映了天然气温度滑移的影响,可以更好地反映出实际天然气冷凝过程中的物性变化,气液两相分布图中可明显观测到二次流扰动现象.为了同时考虑质量扩散热阻的影响,用Silver方法修正了新模型的模拟结果,修正后平均传热系数值与试验测定值的误差在 10.7%～14%,预测精度优于Lee模型 25%的误差精度.修正后的变温相变新模型适用于螺旋管内天然气混合工质的冷凝流动传热计算.
Abstract
For the condensation of mixed working medium in the spiral tube,a variable temperature phase change model for the condensation flow and heat transfer of natural gas was proposed by introducing the temperature slip factor based on Lee's model.Both the new model and Lee's model were used to simulate the condensation flow and heat transfer under different pressure conditions.The results show that the temperature calculated by the new model decreases significantly along the flow direction,which reflects the influence of temperature slip of natural gas.The new model can better reflect the physical property variation of the actual natural gas during condensation,and the secondary flow disturbance phenomenon can be clearly observed in the gas-liquid phase distribution diagram.In order to take the effect of mass diffusion thermal resistance into account,the simulation results of the new model were corrected by the Silver method,and the deviation of the corrected average heat transfer coefficient value from the experimentally determined value was between 10.7%and 14%,the prediction accuracy is better than that of the Lee model(25%).The modified variable temperature phase change model is suitable for the calculation of condensation flow and heat transfer of natural gas mixtures in the spiral tube.
关键词
螺旋管/天然气/变温相变/数值模拟/温度滑移/质量扩散热阻Key words
spiral tube/natural gas/variable temperature phase change/numerical simulation/temperature slip/mass diffusion thermal resistance引用本文复制引用
基金项目
中国船舶集团有限公司第七一一研究所发展基金资助项目(Z2020SFJ-10/NZ)
出版年
2024
NETL
NSTL
维普
万方数据