纳米流体作为一种新型换热介质,其表面张力的变化与流体沸腾换热等热物理性质有着密切的联系。纳米流体通常由“两步法”制得,其表面张力受温度、纳米颗粒粒径、纳米颗粒体积分数或质量分数等多方面影响。在前人的研究中,表面张力随流体温度的升高而减小,随纳米颗粒粒径的增加而增大,但表面张力随纳米颗粒体积分数或质量分数的变化情况则不一致。通过总结由不同颗粒与不同基础流体组成的纳米流体表面张力的变化趋势,分析纳米流体表面张力的变化与颗粒亲水性的关系。分析结果表明:亲水型颗粒与疏水型颗粒对纳米流体表面张力的影响恰好相反;亲水型纳米颗粒体积分数或质量分数不同时,其纳米流体表面张力的变化也不相同。
As a new heat transfer medium,the surface tension of nanofluids has an important relationship with the thermophysical properties.Nanofluids mostly prepared with nanopaticles and base fluids by “two-step” method,sometimes with dispersant.The surface tension of nanofluids was influenced by temperature,particle size,particle concentration and so on.It was increased with increasing temperature and particles size,but the trend of surface tension was contradictory in the past research,compared the composition of nanofluids,the difference may caused by nanoparticles or dispersant.The effect of hydrophilic particles and hydrophobic particles on the surface tension of nanofluids was opposite,and for hydrophilic particles,the surface tension changes were not the same at different particle concentrations.
[1] Pinto R V,Fiorellif A S.Review of the mechanisms responsible for heat transfer enhancement using nanofluids[J].Applied Thermal Engineering,2016,108(5):720-739.
[2] Gamesh G,Prbhu N K.Review of thermo-physical properties,wetting and heat transfer characteristics of nanofluids and their applicability in industrial quench heat treatment[J].Nanoscale Research Letters,2011,6(1):334-348.
[3] Lv L C,Liu Z H.Boiling characteristics in small vertical tubes with closed bottom for nanofluids and nanoparticle-suspensions[J].Heat Mass Transfer,2008,45(1):1-9.
[4] Kim H.Enhancement of critical heat flux in nucleate boiling of nanofluids:a state-of-art review[J].Nanoscale Research Letters,2011,6(1):415-432.
[5] Kamatchi R,Venkatachalapathy S,Nithya C.Experimental investigation and mechanism of critical heat flux enhancement in pool boiling heat transfer with nanofluids[J].Heat Mass Transfer,2016,52(11):2357-2366.
[6] Kim S J,Bang I C,Buongiorrno J,et al.Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux[J].International Journal of Heat and Mass Transfer,2007,50(19/20):4105-4116.
[7] Jeong Y H,Chang W J,Chang S H.Wettability of heated surfaces under pool boiling using surfactant solutions and nanofluids[J].International Journal of Heat and Mass Transfer,2008,51(11/12):3025-3031.
[8] Das P K,Mallik A K,Gangul Y R,et al.Synthesis and characterization of TiO2-water nanofluids with different surfactants[J].International Communications in Heat and Mass Transfer,2016,75(7):341-348.
[9] Huminic A,Huminic G,Fleaca C,et al.Thermal conductivity,viscosity and surface tension of nanofluids based on FeC nanoparticles[J].Powder Technology,2015,284(11):78-84.
[10] Yu W,Xie H Q,Bao D.Enhanced thermal conductivities of nanofluids containing graphene oxide nanosheets[J].Nanotechnology,2009,21(5):055705.
[11] Yu W,Xie H Q,Chen L F,et al.Enhancement of thermal conductivity of kerosene-based Fe3O4 nanofluids prepared via phase-transfer method[J].Colloids and Surfaces A:Physicochemical Engineering Aspects,2010,355(1/2/3):109-113.
[12] Turgut A,Tavman I,Chirtoc M,et al.Thermal conductivity and viscosity measurements of water-based TiO2 nanofluids[J].International Journal of Thermophysics,2009,30(4):1213-1226.
[13] Zafarani-moattar M T,Shekaari H,Munes-rast R,et al.Stability and rheological properties of nanofluids containing ZnO nanoparticles,poly(propylene glycol) and poly(vinyl pyrrolidone)[J].Fluid Phase Equilibria,2015,403(15):136-144.
[14] Lu G,Duan Y Y,Wang X D.Surface tension,viscosity,and rheology of water-based nanofluids:a microscopic interpretation on the molecular level[J].Journal of Nanoparticle Research,2014,16(9):1-11.
[15] Zhu D S,Wu S Y,Wang N.Surface tension and viscosity of aluminum oxide nanofluids[C]//The 6th International Symposium on Multiphase Flow,Heat Mass Transfer and Energy Conversion.AIP Conference Proceedings,2010,1207(1):460-464.
[16] 赵贯甲,毕胜山,吴江涛.表面光散射法液体粘度和表面张力实验系统研制[J].工程热物理学报,2015,36(1):36-40.
[17] Moosavi M,Goharshadi E K,Youssefi A.Fabrication,characterization,and measurement of some physicochemical properties of ZnO nanofluids[J].International Journal of Heat and Fluid Flow,2010,31(4):599-605.
[18] Mursheds M S,Milanova D,Kumar R.An experimental study of surface tension-dependent pool boiling characteristics of carbon nanotubes-nanofluids[C]//ASME 2009 7th International Conference on Nanochannels,Pohang,South Korea:2009:75-80.
[19] Chois U S.Enhancing thermal conductive of fluids with nanoparticles[J].ASME FED,1995,231(66):99-105.
[20] 许世民,郎中敏,王亚雄,等.羧基化碳纳米管/水纳米流体核沸腾传热研究[J].工程热物理学报,2017,38(2):210-317.
[21] 毕胜山,史琳.纳米流体沸腾传热研究进展[J].化工进展,2007,26(10):1411-1418.
[22] 唐潇,刁彦华,赵耀华,等.δ-Al2O3-R141b纳米流体的池内核态沸腾传热特性[J].化工学报,2012,63(1):64-70.
[23] Kumar R,Milanova D.Effect of surface tension on nanotube nanofluids[J].Applied Physics Letters,2009,94(7):073107.
[24] Saleh H,Hadhimi I.Combined surface tension and natural convection of nanofluids in a square open cavity[J].World Academy of Science,Engineering and Technology,International Science Index,Mechanical and Mechatronics Engineering,9(2):540.
[25] Zheng Z Z.Experimental investigation on surface tension of water-based graphene oxide nanofluids[J].Advanced Materials Research,2014,1082:297-301.
[26] Chinnam J,Das D K,Vzjjha R S,et al.Measurements of the contact angle of nanofluids and development of a new correlation[J].International Journal of Thermal Sciences,2015,62(3):68-80.
[27] Bhuiyan M H U,Saidur R,Mostafizur R M,et al.Experimental investigation on surface tension of metal oxide-water nanofluids[J].International Communications in Heat and Mass Transfer,2015,65(7):82-88.
[28] Bhuiyan M H U,Saidur R,Amalina M A,et al.Effect of nanoparticles concentration and their sizes on surface tension of nanofluids[J].Procedia Engineering,2015,105:431-437.
[29] Bhuiyan M H U,Saidur R,Amalina M A,et al.Effect of surface tension on SiO2-methanol nanofluids[J].Materials Science and Engineering,2015,88:012056.
[30] Ahammed N,Asirvathaml G,Wongwises S.Effect of volume concentration and temperature on viscosity and surface tension of grapheme-water nanofluid for heat transfer applications[J].Journal of Thermal Analysis and Calorimetry,2016,123(2):1399-1409.
[31] Zhou Z Y,Di Q Q,Liu B,et al.Experimental study on the surface tension of Al2O3-H2O nanofluid[J].Materials Science Forum,2016,852:394-400.
[32] Ranjbar H,Khosravi-nikou M R,Safiri A,et al.Experimental and theoretical investigation on nano-fluid surface tension[J].Journal of Natural Gas Science and Engineering,2015,27:1806-1813.
[33] Tanvir S,Li Q.Surface tension of nanofluid-type fuels containing suspended nanomaterials[J].Nanoscale Research Letters,2012,7(1):226-235.
[34] Panzali M N,Kanaris A G,Antoniadis K D,et al.Effect of nanofluids on the performance of a miniature plate heat exchanger with modulated surface[J].International Journal of Heat and Fluid Flow,2009,30(4):691-699.
[35] Okubo T.Surface tension of structured colloidal suspensions of polystyrene and silica spheres at the air-water interface[J].Journal of Colloid and Interface Science,1995,171(1):55-62.
[36] Chen R H,Phuoc T X,Martell O D.Surface tension of evaporating nanofluid droplets[J].International Journal of Heat and Mass Transfer,2011,54(11/12):2459-2466.
[37] Yang L,Du K.Investigations of surface tension of binary nanofluids[J].Advanced Materials Research,2011,347/348/349/350/351/352/353:786-790.
PDF
(1205KB)
