摘要
Abstract
In order to improve the heat transfer performance of ambient vaporizers,internally threaded tubes were used to replace the base tubes in conventional star-fin tube assemblies.A new vaporizer configuration was designed and analyzed using Fluent software and the orthogonal experimental method.A representative ambient vaporizer was selected as the study object,for which a numerical simulation model was developed and validated.Taking the performance evaluation criterion(PEC)for enhanced heat transfer as the objective function,and considering helix angle,number of threads,and the thread height-to-diameter ratio as key influencing parameters,an orthogonal experimental method was then formulated,and computational analysis was conducted.The results indicate that,in terms of contribution to heat transfer enhancement,the influencing factors are ranked as follows:number of threads,helix angle,and thread height-to-diameter ratio.Within the parameter range of the internally threaded finned tube structure studied in this paper,the optimal combination is a helix angle of 30°,30 threads,and a thread height-to-diameter ratio of 1.25×10-2.Compared to conventional star-fin tubes,the optimized internally threaded tube achieves a 1.351 times increase in PEC.The inner wall temperature and velocity of the finned tube with threads are significantly higher than those in the conventional design.The internal convective heat transfer coefficient improves by more than 18.5％,and the liquefied natural gas(LNG)in the main flow region can be completely vaporized earlier.关键词
天然气/空温式气化器/传热性能/内螺纹管/正交试验Key words
natural gas/ambient vaporizer/heat transfer performance/internally threaded tube/orthogonal experimental design分类
能源科技
