CAJ | 학술논문

扭曲管是一种高效的管程强化传热管。对这一管形的传热性能及流阻性能进行了深入地数值模拟研究。结果表明，与普通圆管相比，扭曲管由于其结构的特殊性，使得管内介质不断冲刷管壁，造成扭曲管管壁附近传热边界层厚度减薄的现象，提高了管内介质对流传系数，传热效果明显增强。此外，在相同雷诺数下，扭曲管的管内对流传热系数比圆管高30％，而综合性能高出30％～35％。在此基础上，对扭曲管的结构尺寸（截面比例 ai ／bi 和螺距 s）进行了研究，扭曲管结构尺寸对其传热及流阻性能的影响较大，在模拟范围内，截面比例 ai ／bi ＝2或螺距 s ＝100 mm 的扭曲管综合性能最优。最后，通过对数值模拟的数据进行处理，拟合出统一的扭曲管管内 Nu 和ΔP 公式，对工程设计有较大指导意义。
뉴곡관시일충고효적관정강화전열관。대저일관형적전열성능급류조성능진행료심입지수치모의연구。결과표명，여보통원관상비，뉴곡관유우기결구적특수성，사득관내개질불단충쇄관벽，조성뉴곡관관벽부근전열변계층후도감박적현상，제고료관내개질대류전계수，전열효과명현증강。차외，재상동뢰낙수하，뉴곡관적관내대류전열계수비원관고30％，이종합성능고출30％～35％。재차기출상，대뉴곡관적결구척촌（절면비례 ai ／bi 화라거 s）진행료연구，뉴곡관결구척촌대기전열급류조성능적영향교대，재모의범위내，절면비례 ai ／bi ＝2혹라거 s ＝100 mm 적뉴곡관종합성능최우。최후，통과대수치모의적수거진행처리，의합출통일적뉴곡관관내 Nu 화ΔP 공식，대공정설계유교대지도의의。
Twisted tube is a kind of highly enhanced heat transfer tube pipe.Numerical simulation of the heat transfer and flow resistance performance were studied in depth.The result showed that,compared with the round tube,the structure of twisted tube is special,which made the medium in the tube scour the wall continually.This led to the heat transfer boundary layer thickness thinning near the wall,improving the convection coefficient of the medium in the tube,and enhancing the heat transfer effect obviously.For the same Reynolds number,the tube convective heat-transfer coefficient of twisted tube was 30% higher than the normal tube.What′s more,the integrated performance increase of 30% ~35%.On these basis, the structure sizes of twisted tubes(cross-sectional ratio of ai /bi and pitch s)were studied.The structure sizes of twisted tube effected greatly on the performance of the heat transfer and flow resistance.The twis-ted tube wiht a cross-section ratio of 2 or a pitch of 100 mm showed the best integrated performance.In the end of,processed by the numerical simulation data,it showed a uniform formula for these twist tubes of Nu and ΔP,which has great guiding significance to engineering design.