【摘要】：紐帶作為一種高效強(qiáng)化換熱的擾流元件,廣泛應(yīng)用于化工設(shè)備的強(qiáng)化換熱、防垢、流體混合等領(lǐng)域。國(guó)內(nèi)外學(xué)者針對(duì)內(nèi)置紐帶管內(nèi)部流體流動(dòng)及強(qiáng)化傳熱開展了諸多研究,但紐帶的強(qiáng)化換熱性能還需要進(jìn)一步提高。本文針對(duì)紐帶管研究的流動(dòng)工況較少,普通紐帶管強(qiáng)化傳熱綜合性能欠佳,結(jié)構(gòu)優(yōu)化不夠全面等問題,開發(fā)了三邊紐帶,用Fluent 15.0模擬了內(nèi)置普通紐帶、格柵紐帶以及三邊紐帶在湍流(Re=5000~30000)和層流(Re=400~1500)工況下管內(nèi)流體傳熱和阻力特性,并與圓管進(jìn)行對(duì)比,結(jié)果表明三邊紐帶管的綜合性能較好;并進(jìn)一步從紐帶邊數(shù)n、扭率y、邊長(zhǎng)m對(duì)紐帶管進(jìn)行了結(jié)構(gòu)參數(shù)的優(yōu)化;最后模擬分析了圓管及紐帶管的抗垢性能,得到的結(jié)論如下:數(shù)值模擬結(jié)果表明,內(nèi)置紐帶管能使流體產(chǎn)生螺旋流動(dòng),誘導(dǎo)流體產(chǎn)生偏離軸線方向的徑向及切向流動(dòng),從而加劇近壁區(qū)流體與主流區(qū)流體的摻混,減薄流體速度和溫度邊界層,加速管壁熱量向管內(nèi)流體的傳遞,提高了管壁處流體的對(duì)流換熱系數(shù)。湍流工況下模擬結(jié)果表明,三邊紐帶管的Nu較大,格柵紐帶管和普通紐帶管傳熱性能相當(dāng),Nu最小;紐帶管對(duì)應(yīng)的阻力系數(shù)f從高到低依次是:格柵紐帶、三邊紐帶和普通紐帶;三邊紐帶管的綜合性能評(píng)價(jià)因子η高于其他紐帶管。對(duì)紐帶管結(jié)構(gòu)參數(shù)的優(yōu)化結(jié)果表明,Nu和f隨著紐帶邊數(shù)和邊長(zhǎng)的增加而增加,隨著扭率的增加而減小;通過對(duì)比各參數(shù)紐帶管的綜合性能發(fā)現(xiàn),扭率y=2.0、邊長(zhǎng)m=9mm的三邊紐帶管的綜合性能較好,綜合性能評(píng)價(jià)因子η=1.33,分別比圓管和普通紐帶管高出11.9%~33.2%,5.47%~5.98%。層流工況下模擬研究表明,除五邊紐帶管外,邊數(shù)越多,Nu越大。Nu和f隨邊數(shù)和邊長(zhǎng)的增加而增加,隨扭率的增加而減小;模擬得出y=2.0,m=9mm的三邊紐帶管的綜合性能較好,綜合性能評(píng)價(jià)因子η達(dá)到4.96。對(duì)圓管及紐帶管的抗垢性能研究表明,紐帶管內(nèi)流體的螺旋流動(dòng)沖刷管壁,使Ca Co3顆粒污垢徑向分布比較均勻,在換熱管內(nèi)不易沉積,其抗垢性能明顯優(yōu)于圓管。計(jì)算得到的圓管、普通紐帶管和三邊紐帶管的顆粒污垢不均勻系數(shù)(CV)分別為:8.72%,3.71%,3.22%,不均勻系數(shù)越小表明紐帶管的抗垢性能越好;通過對(duì)比研究粒徑為5um、10um和20um的顆粒污垢分布特性得出,污垢顆粒的直徑影響換熱管的抗垢性能,在所研究的粒徑范圍內(nèi),顆粒直徑越大,換熱管越容易結(jié)垢。
[Abstract]:As a kind of high efficiency heat transfer spoiler, tie is widely used in the fields of chemical equipment, such as enhanced heat transfer, scale prevention, fluid mixing and so on. Scholars at home and abroad have carried out a lot of research on fluid flow and enhanced heat transfer in the inner tube, but the enhanced heat transfer performance of the tie still needs to be further improved. In this paper, a trilateral tie is developed and simulated by Fluent 15.0, aiming at the problems of less flow conditions, poor comprehensive heat transfer enhancement and structural optimization of the tie tube. The characteristics of heat transfer and resistance in the tube under turbulent (Re=5000~30000) and laminar flow (Re=400~1500) conditions are compared with those of the circular tube. The results show that the comprehensive performance of the triangular-tie tube is better than that of the circular tube. Furthermore, the structural parameters of the tie tube are optimized from the following aspects: the number of the tie edges n, the torsion ratio yand the length m. Finally, the anti-fouling performance of the circular tube and the tie tube is simulated and analyzed. The conclusions are as follows: the numerical simulation results show that, The inner tie tube can make the fluid produce spiral flow, induce the fluid to produce radial and tangential flow away from the axis, and thus aggravate the mixing of the near wall fluid with the mainstream fluid, and reduce the velocity and temperature boundary layer of the fluid. The heat transfer from the tube wall to the fluid in the tube increases the convection heat transfer coefficient of the fluid in the tube wall. The simulation results under turbulent conditions show that the Nu of the triangulated tie tube is larger, the heat transfer performance of the grid tie tube and the ordinary tie tube is equivalent to that of the Nu, and the resistance coefficient f of the tie tube is in order from high to low: the grid tie, the trilateral tie and the ordinary tie. The comprehensive performance evaluation factor 畏 of trilateral tie tube is higher than that of other tie tubes. The optimization results of the structural parameters of the tie tube show that Nu and f increase with the increase of the number and length of the tie edges, and decrease with the increase of the torsion ratio. The torsion ratio is 2.0 and the side length m=9mm trilateral tie tube has better comprehensive performance, and the comprehensive performance evaluation factor 畏 1.33 is higher than that of circular tube and ordinary tie tube by 11.9and 33.2and 5.475.98, respectively. The simulation results under laminar flow condition show that the more Nu and f increase with the increase of the number of edges and the length of the edges, and the decrease with the increase of torsion ratio, the simulation results show that the comprehensive performance of the trilateral tie tube with yyong 2.0mm is better than that of the tube with 9mm. The comprehensive performance evaluation factor 畏 is 4.96. The study on the anti-fouling performance of the circular pipe and the tie tube shows that the spiral flow of the fluid in the tie tube scour the wall of the pipe, which makes the fouling distribution of Ca Co3 particles more uniform, and it is not easy to deposit in the heat transfer pipe, and its anti-fouling performance is obviously better than that of the circular tube. The calculated non-uniform coefficient of particle fouling of round tube, common tie tube and trilateral tie tube is (CV) of 8.72and 3.71and 3.22 respectively. The smaller the non-uniformity coefficient is, the better the anti-fouling performance of tie tube is. By comparing the characteristics of fouling distribution between 5um 10um and 20um particles, it is concluded that the diameter of fouling particles affects the anti-fouling performance of heat transfer tubes. The larger the particle diameter is, the easier the heat exchanger tube is to scale in the range of the studied particle diameter.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ055.81

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