本文選題：納米流體 + 傳熱　； 參考：《東北電力大學(xué)》2015年碩士論文

【摘要】：納米流體強(qiáng)化傳熱以及管內(nèi)插入扭帶強(qiáng)化傳熱已經(jīng)成為應(yīng)用廣泛，技術(shù)比較成熟的強(qiáng)化傳熱技術(shù)。納米流體的研究主要集中在：納米流體體系的選擇、納米流體的制備及穩(wěn)定性研究、納米流體熱導(dǎo)率影響因素及模型研究、納米流體強(qiáng)化傳熱機(jī)理研究、納米流體粘度測量及影響因素研究。而對納米流體應(yīng)用在強(qiáng)化管中的研究較少，于是本文通過理論驗(yàn)證及實(shí)驗(yàn)來研究納米流體在內(nèi)置扭帶管表面?zhèn)鳠崽匦约傲鲃犹匦裕紫葘?nèi)置扭帶管的強(qiáng)化因素進(jìn)行理論計(jì)算分析，然后研究納米流體穩(wěn)定性與分散劑的關(guān)系，制備出穩(wěn)定性最好的納米流體，并測量其熱導(dǎo)率，接著設(shè)計(jì)并建立一套納米流體表面?zhèn)鳠釋?shí)驗(yàn)系統(tǒng)，Reynolds數(shù)（Re）在2000～7000的范圍內(nèi)，分別對質(zhì)量分?jǐn)?shù)為0.1%，0.3%和0.5%的不同納米流體在扭轉(zhuǎn)比H/d為3.5-5.5的內(nèi)置扭帶管中的傳熱特性進(jìn)行實(shí)驗(yàn)研究。結(jié)果表明：隨著Re增加，納米流體和去離子水的沿程阻力系數(shù)f均減少；水的沿程阻力系數(shù)f小于納米流體，納米流體的質(zhì)量分?jǐn)?shù)與沿程阻力f成正比，內(nèi)置扭帶管的沿程阻力f大于光管，且隨著扭轉(zhuǎn)比的增大而減少，，三種納米流體的沿程阻力系數(shù)f十分相近；Nusselt數(shù)（Nu）隨Re和納米顆粒質(zhì)量分?jǐn)?shù)的增大而增大；納米流體的Nu比水高，內(nèi)置扭帶管的努謝爾數(shù)Nu大于光管，且隨著扭轉(zhuǎn)比的增大而減少，三種納米流體相比，Cu-水納米流體的Nu最大。質(zhì)量分?jǐn)?shù)為0.5%的Cu-水納米流體在Y=3.5與Y=5.5的內(nèi)置扭帶管的增強(qiáng)幅度分別為2.29與2.14。
[Abstract]:Nano-fluid heat transfer enhancement and heat transfer enhancement by inserting torsion strip into tube have been widely used and the technology is relatively mature. The research of nano-fluid mainly focuses on the selection of nano-fluid system, the preparation and stability of nano-fluid, the influence factors and models of thermal conductivity of nano-fluid, the mechanism of heat transfer enhancement of nano-fluid. Study on viscosity Measurement and influencing factors of Nanofluids. However, there is little research on the application of nano-fluid in the strengthened tube, so the heat transfer and flow characteristics of nano-fluid on the surface of the inner torsion tube are studied by theoretical verification and experiment. Firstly, the strengthening factors of the inner torsion tube were calculated and analyzed theoretically, then the relationship between the stability of nano-fluid and dispersant was studied, the best stability of nano-fluid was prepared, and its thermal conductivity was measured. Then, an experimental system for surface heat transfer of nanoscale fluids is designed and built. The heat transfer characteristics of different nano-fluids with 0.1% and 0.5% mass fraction in a torsional tube with a torsional ratio of 3.5-5.5 are investigated in the range of 2000 ~ 7000, respectively. The results show that with the increase of re, the drag coefficient f of both nano-fluid and deionized water decreases, and the resistance coefficient f of water is smaller than that of nano-fluid, and the mass fraction of nano-fluid is proportional to the resistance f. The side resistance f of the inner torsion tube is larger than that of the light tube, and decreases with the increase of the torsion ratio. The resistance coefficient f is very close to the Nusselt number and Nu) of the three kinds of nanofluids increases with the increase of re and the mass fraction of the nanoparticles. The Nu of nanofluids is higher than that of water. The Nu number of the inner torsion tube is larger than that of the light tube, and decreases with the increase of the torsion ratio. The Nu of the three nanofluids is the largest compared with the Cu-water nanofluids. The reinforcements of Cu-water nanofluids with 0.5% mass fraction are 2.29 and 2.14 in the inner torsion tube of Yi 3.5 and Y 5. 5, respectively.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK124

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