本文選題：二氧化鈦納米流體 + 制備��； 參考：《濟南大學(xué)》2017年碩士論文

【摘要】：納米流體是一種含有納米級尺寸固體顆粒的懸浮液,是一種新型的高效傳熱介質(zhì)。與傳統(tǒng)的傳熱介質(zhì)相比,其具有很高的導(dǎo)熱性能,應(yīng)用于換熱設(shè)備里可以提高設(shè)備傳熱效率,滿足換熱系統(tǒng)高負(fù)荷的要求。作為目前國內(nèi)外傳熱領(lǐng)域的研究熱點之一,納米流體的研究開發(fā)將會給熱工工程領(lǐng)域帶來新的發(fā)展,將豐富強化傳熱內(nèi)容,不僅在理論上將具有較高的學(xué)術(shù)價值,對實際工程應(yīng)用亦有很重要的指導(dǎo)作用,同時對于我國實現(xiàn)節(jié)能減排、促進保護環(huán)境具有更重要意義。本文以不同形貌二氧化鈦納米流體為研究對象,研究了納米流體的制備過程,分析了不同形貌納米流體的導(dǎo)熱性能、粘度和潤濕性等熱物性能,主要研究工作如下:1、利用水熱法,成功制備出棒狀(金紅石相,200nm,?30nm)、菱形(銳鈦礦,105nm×15nm)和片狀(銳鈦礦,110nm×12nm)三種形貌質(zhì)量分?jǐn)?shù)為0.05wt.%~0.4wt.%的二氧化鈦納米流體,掌握了其制備工藝過程,并探究反應(yīng)物濃度、反應(yīng)時間和反應(yīng)溫度對棒狀二氧化鈦納米顆粒形貌與晶型的影響,發(fā)現(xiàn)低濃度、長時間和高溫度的反應(yīng)條件有利于棒狀顆粒的長大和晶體晶化程度的提高。2、對三種形貌二氧化鈦納米流體的導(dǎo)熱系數(shù)進行實驗研究,分析了溫度、質(zhì)量分?jǐn)?shù)、顆粒形貌和晶型對二氧化鈦納米流體導(dǎo)熱系數(shù)的影響,并進一步將實驗值與經(jīng)驗?zāi)Ｐ陀嬎阒颠M行對比。研究發(fā)現(xiàn),納米流體導(dǎo)熱系數(shù)隨著溫度升高和質(zhì)量分?jǐn)?shù)的增大而增大,與基液相比,導(dǎo)熱系數(shù)最大增大49.10%,銳鈦礦相二氧化鈦納米流體導(dǎo)熱系數(shù)比金紅石相納米流體導(dǎo)熱系數(shù)大3.28%~4.47%,片狀納米流體導(dǎo)熱系數(shù)比菱形納米流體導(dǎo)熱系數(shù)大2.39%。同時,實驗結(jié)果可以與Sharma模型計算值相吻合,誤差范圍為2.15%~5.13%,表明可以用Sharma模型預(yù)測納米流體的導(dǎo)熱系數(shù)。3、對三種形貌二氧化鈦納米流體的粘度進行系統(tǒng)研究,探究了溫度、質(zhì)量分?jǐn)?shù)、顆粒形貌和晶型對納米流體粘度的影響,并進一步將實驗值與經(jīng)驗?zāi)Ｐ陀嬎阒颠M行對比。結(jié)果表明,納米流體的粘度隨著質(zhì)量分?jǐn)?shù)的增大而增大,隨著溫度的升高而降低,與基液相比,粘度最大增大19.73%,銳鈦礦相二氧化鈦納米流體粘度比金紅石相納米流體粘度大2.5%,片狀納米流體粘度比菱形納米流體粘度稍大。Bobbo模型可以準(zhǔn)確計算質(zhì)量分?jǐn)?shù)較高的納米流體的粘度值,其最小誤差僅為0.19%。4、對三種形貌二氧化鈦納米流體的潤濕性進行研究,并探究溫度、質(zhì)量分?jǐn)?shù)、顆粒形貌和晶型對納米流體潤濕性的影響。結(jié)果表明:(1)納米流體表面張力隨著溫度升高和質(zhì)量分?jǐn)?shù)的增大而減小,與基液相比,表面張力最大降低16.95%,銳鈦礦相二氧化鈦納米流體表面張力比金紅石相納米流體表面張力大0.125~0.917mN/m;(2)與表面張力性質(zhì)相似,納米流體接觸角隨著溫度升高和質(zhì)量分?jǐn)?shù)的增大而減小,與基液相比,接觸角降低了21.98%~25%,銳鈦礦相二氧化鈦納米流體接觸角比金紅石相納米流體接觸角大0.5°;形貌對二氧化鈦納米流體的潤濕性無明顯影響規(guī)律。
[Abstract]:Nanofluid is a kind of suspension liquid containing nanometer size solid particles. It is a new type of high efficient heat transfer medium. Compared with the traditional heat transfer medium, it has high thermal conductivity. It can improve the heat transfer efficiency of the equipment and meet the requirement of high negative charge in heat exchange system. One of the hot spots, the research and development of nanofluids will bring new development to the field of thermal engineering, and will enrich the content of heat transfer. It will not only have higher academic value in theory, but also have a very important guiding role in practical engineering application. It is of great significance to realize the reduction of energy saving and the protection of the environment in China. The preparation process of nanofluids with different morphologies was studied. The thermal properties, viscosity and wettability of different morphology nanofluids were analyzed. 1, 1, the rod like (Jin Hongshi phase, 30nm), rhombus (anatase, 105nm x 15nm) were successfully prepared by hydrothermal method. Three kinds of titanium dioxide nanofluids with the mass fraction of 0.05wt.%~0.4wt.% (anatase, 110Nm x 12NM) were prepared and the effects of the reaction time and temperature on the morphology and crystal shape of the TiO2 nanoparticles were investigated, and the reaction conditions of low concentration, long time and high temperature were found. The thermal conductivity of three kinds of titanium dioxide nanofluids was investigated by.2. The influence of temperature, mass fraction, particle morphology and crystal shape on the thermal conductivity of titanium dioxide nanofluids was investigated. The experimental values were compared with those of empirical models. It is found that the thermal conductivity of nanofluids increases with the increase of temperature and mass fraction, and the thermal conductivity of the anatase titanium dioxide nanofluids is larger than that of the rutile nanofluids, and the thermal conductivity of the anatase titanium dioxide nanofluids is 3.28%~4.47%, and the thermal conductivity of the flake nanofluids is 2 higher than that of the rhombus nanofluids. .39%. also coincides with the calculated values of the Sharma model, and the error range is 2.15%~5.13%. It shows that the thermal conductivity of nanofluids can be predicted by Sharma model, and the viscosity of three kinds of nanofluids is systematically studied. The temperature, mass fraction, particle morphology and crystalline form of nanofluid viscosity are investigated. The results show that the viscosity of the nanofluids increases with the mass fraction, and decreases with the increase of the temperature. The viscosity increases by 19.73% compared with the base solution, and the viscosity of anatase titanium dioxide nanofluids is 2.5% more than that of rutile nanofluids. The viscosity of nanofluids with a larger viscosity than the rhombus nanofluids can be accurately calculated by the.Bobbo model. The minimum error is only 0.19%.4. The wettability of three kinds of nanofluids is studied and the wettability of the nanofluids is investigated by the temperature, mass fraction, particle morphology and crystal type. The results show that: (1) the surface tension of nanofluids decreases with the increase of temperature and mass fraction, the maximum surface tension decreases by 16.95% compared with the base solution, and the surface tension of anatase titanium dioxide nanofluids is 0.125~ 0.917mN/m larger than that of rutile nanofluids; (2) the surface tension is similar to that of the nanofluids. The contact angle decreases with the increase of temperature and mass fraction. Compared with the base solution, the contact angle decreases by 21.98%~25%. The contact angle of anatase titanium dioxide nanofluids is 0.5 degrees larger than that of rutile nanofluids, and the morphology has no obvious influence on the wettability of titanium dioxide nanofluids.
【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ134.11;TB383.1

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