Nanofluid Droplet Evaporation Kinetics and Wetting Dynamics on Flat Substrates

Abstract:

An experimental investigation into the evaporation of sessile nanofluid droplets is reported in this paper. The effect of nano-particle addition on the evaporative behaviour is studied using ethanol and Titanium Oxide nano-particles. The results show that a distinct ‘stick-slip’ pinning behaviour is observed when nano-particles are added to the base liquid. Increasing the nano-particle concentration was found to enhance the ‘stick-slip’ behaviour. This behaviour is attributed to the effects of evaporatively driven particle accumulation near the contact line. This in turn leads to an increase in localised viscosity, and an enhancement of contact line pinning.

• Periodical: Journal of Nano Research (Volume 7)
• Pages: 75-80
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.7.75
• Online since: July 2009
• Authors: J.Ross Moffat, Khellil Sefiane, Martin E.R. Shanahan
• Keywords: Contact Angle (CA), Drop, Evaporation, Nanofluid, Nanoparticle, Wetting

References

[1] Maxwell, J.C., A Treatise on Electricity and Magnetism, . Clarendon Press, Oxford, UK 1881. 2nd ed.

[2] Eastman, J.A., et al. Enhanced thermal conductivity through the development of nanofluids. 1996. United States.

[3] H. Masuda, A.E., K. Teramae and N. Hishinuma , Alteration of thermal conductivity and viscosity of liquid by dispersing ultra-fine particles (dispersions of γ-Al2O3, SiO2, and TiO2 ultra-fine particles). Netsu Bussei, 1993. 4: p. pp.227-233.

DOI: 10.2963/jjtp.7.227

[4] Keblinski, P., J.A. Eastman, and D.G. Cahill, Nanofluids for thermal transport. Materials Today, 2005. 8(6): p.36.

DOI: 10.1016/s1369-7021(05)70936-6

[5] Lee, S., et al., Measuring thermal conductivity of fluids containing oxide nanoparticles. Journal of Heat Transfer ; VOL. 121 ; ISSUE: 2 ; PBD: May 1999, 1999: p. pp.280-289 ; PL.

DOI: 10.1115/1.2825978

[6] Murshed, S.M.S., K.C. Leong, and C. Yang, Enhanced thermal conductivity of TiO2-water based nanofluids. International Journal of Thermal Sciences, 2005. 44(4): p.367.

DOI: 10.1016/j.ijthermalsci.2004.12.005

[7] Picknett, R.G. and R. Bexon, The evaporation of sessile or pendant drops in still air. Journal of Colloid and Interface Science, 1977. 61(2): pp.336-350.

DOI: 10.1016/0021-9797(77)90396-4

[8] Hu, H. and R.G. Larson, Evaporation of a Sessile Droplet on a Substrate. J. Phys. Chem. B, 2002. 106(6): pp.1334-1344.

DOI: 10.1021/jp0118322

[9] Shanahan, M.E.R. and C. Bourgès, Effects of evaporation on contact angles on polymer surfaces. International Journal of Adhesion and Adhesives, 1994. 14(3): pp.201-205.

DOI: 10.1016/0143-7496(94)90031-0

[10] Guéna, G., et al., Evaporation of sessile liquid droplets. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2006. 291(1-3): pp.191-196.

DOI: 10.1016/j.colsurfa.2006.07.021

[11] Shanahan, M.E.R., Simple Theory of Stick-slip, Wetting Hysterisis. Langmuir, 1995. 11: pp.1041-1043.

DOI: 10.1021/la00003a057

[12] Birdi, K.S., Vu, D.T., Wettability and the evaporation rates of fluids from solid surfaces. J. Adhes. Sci. Technol., 1993. 7: p.485.

[13] Deegan, R.D., Bakajin, O., Dupont, T.F., Huber, G., Nagel, S.R., Witten, T.A., Capillary flow as the cause of ring stains from dried liquid drops. Nature, 1997. 389(6653): pp.827-829.

DOI: 10.1038/39827

[14] Chen, H., et al., Rheological behaviour of ethylene glycol based titania nanofluids. Chemical Physics Letters, 2007. 444(4-6): pp.333-337.

DOI: 10.1016/j.cplett.2007.07.046