發(fā)布時間：2018-12-20 13:24

【摘要】：采用Fluent軟件,對基管相同的圓翅片管和5種橢圓翅片管用穩(wěn)態(tài)RNGκ-ε模型進(jìn)行三維數(shù)值模擬,5種橢圓翅片管A_(fin),A_(min),D_e,P_(er),β分別與圓翅片(C_(ir))有相同的翅片面積、最小截面面積、翅片當(dāng)量直徑、翅片周長和翅化比.通過對不同雷諾數(shù)(Re)下流場及翅片表面局部努塞爾數(shù)(Nu)的分析比較,得到翅片管通道內(nèi)流體流動及換熱的特征,并提供了圓翅片管和5種橢圓翅片管的綜合換熱性能Nu/f的結(jié)果.研究表明,圓翅片C_(ir)的Nu大于橢圓翅片A_(fin),D_e,P_(er),β,但小于橢圓翅片A_(min).圓翅片的阻力系數(shù)f大于橢圓翅片A_(fin),P_(er),β的f,且小于橢圓翅片A_(min)的f.橢圓翅片D_e在Re較小(Re≤8 000)時與圓翅片C_(ir)的f的差值較小,在Re較大(Re8 000)時與圓翅片C_(ir)基本相同.橢圓翅片A_(min)的綜合換熱效果最好.
[Abstract]:Using Fluent software, three dimensional numerical simulation of circular fin tube and five elliptical fin tubes with the same base tube were carried out using steady-state RNG 魏-蔚 model. Five kinds of elliptical fin tubes A _ (fin), A _ (min), D _ P _ (er), were simulated. 尾 has the same fin area, minimum cross-section area, equivalent diameter, circumference and winged ratio as circular fin (C _ (ir), respectively. The characteristics of fluid flow and heat transfer in finned tube channel are obtained by analyzing and comparing the flow field and local Nussel number (Nu) of fin surface under different Reynolds number (Re). The results of Nu/f for the heat transfer properties of round finned tubes and five elliptical fin tubes are also presented. The results show that the Nu of circular fin C _ (ir) is larger than that of elliptical fin A _ (fin), D _ (er), 尾, but smaller than that of elliptical fin A _ (min). The drag coefficient f of circular fin is larger than that of elliptical fin A _ (fin), P _ (er), 尾 and is smaller than that of elliptical fin A _ (min). The difference between elliptical fin de and circular fin C _ (ir) is smaller when Re is smaller (Re 鈮，

本文編號：2388055