Experiments in Fluids

, Volume 52, Issue 3, pp 795–807 | Cite as

Particle image velocimetry and infrared thermography in a levitated droplet with nanosilica suspensions

Research Article

Abstract

Preferential accumulation and agglomeration kinetics of nanoparticles suspended in an acoustically levitated water droplet under radiative heating has been studied. Particle image velocimetry performed to map the internal flow field shows a single cell recirculation with increasing strength for decreasing viscosities. Infrared thermography and high speed imaging show details of the heating process for various concentrations of nanosilica droplets. Initial stage of heating is marked by fast vaporization of liquid and sharp temperature rise. Following this stage, aggregation of nanoparticles is seen resulting in various structure formations. At low concentrations, a bowl structure of the droplet is dominant, maintained at a constant temperature. At high concentrations, viscosity of the solution increases, leading to rotation about the levitator axis due to the dominance of centrifugal motion. Such complex fluid motion inside the droplet due to acoustic streaming eventually results in the formation of a ring structure. This horizontal ring eventually reorients itself due to an imbalance of acoustic forces on the ring, exposing larger area for laser absorption and subsequent sharp temperature rise.

Supplementary material

348_2011_1114_MOESM1_ESM.avi (75.2 mb)
Supplementary material 1 (AVI 77,019 kb)
348_2011_1114_MOESM2_ESM.avi (18.9 mb)
Supplementary material 2 (AVI 19,303 kb)

References

  1. Abe Y, Yamamoto Y, Hyuga D, Aoki K, Fujiwara A (2007) Interfacial stability and internal flow of a levitated droplet. Microgravity Sci Technol 19:33–34CrossRefGoogle Scholar
  2. Basu S, Cetegen BM (2008) Modeling of thermophysical processes in liquid ceramic precursor droplets heated by monochromatic irradiation. J Heat Transf 130:071501.1–071501.8Google Scholar
  3. Brandt EH (2001) Acoustic physics suspended by sound. Nature 413:474–475CrossRefGoogle Scholar
  4. Bremer LGB, Walstra P, von Vilet T (1995) Estimations of the aggregation time of various colloidal systems. Colloids Surf A: Physicochem Eng Aspects 99:121–127CrossRefGoogle Scholar
  5. Bremson MA (1968) Infrared radiation: a handbook for applications. Plenum Press, NYGoogle Scholar
  6. Deegan RD, Bakajin O, Dupont TF, Huber G, Nagel SR, Witten TA (1997) Capillary flow as the cause of ring stains from dried liquids. Nature 389:827–829CrossRefGoogle Scholar
  7. Deegan RD, Bakajin O, Dupont TF, Huber G, Nagel SR, Witten TA (2000) Contact line deposits in an evaporating drop. Phys Rev E 62:756–765CrossRefGoogle Scholar
  8. Kumar R, Tijerino E, Saha A, Basu S (2010) Structural morphology of acoustically levitated and heated nanosilica droplet. Appl Phys Lett 97:1231061–1231063Google Scholar
  9. Lage PLC, Rangel RH (1993) Single droplet vaporization including thermal radiation absorption. J Thermophys Heat Transf 7:502CrossRefGoogle Scholar
  10. Lierke EG, Holitzner L (2008) Perspectives of an acoustic-electrostatic/electrodynamic hybrid levitator for small fluid and solid samples. Meas Sci Technol 19:115803Google Scholar
  11. Mason SG (1977) Orthokinetic phenomena in disperse systems. J Colloid Interf Sci 58:275–285CrossRefGoogle Scholar
  12. Omrane A, Santesson S, Aldéna M, Nilsson S (2004) Laser techniques in acoustically levitated micro droplets. Lab Chip 4:287–291CrossRefGoogle Scholar
  13. Park B, Armstrong RL (1989) Laser droplet heating: fast and slow heating regimes. Appl Opt 28:3671–3680CrossRefGoogle Scholar
  14. Park J, Moon J (2006) Control of colloidal particle deposit patterns within picoliter droplets ejected by ink-jet printing. Langmuir 22:3506–3513CrossRefGoogle Scholar
  15. Prasad A, Adrian R, Landreth C, Offutt P (1992) Effect of resolution on the speed and accuracy of particle image velocimetry interrogation. Exp Fluids 13:105–116CrossRefGoogle Scholar
  16. Raffel M, Willert C, Kompenhans J (1998) Particle image velocimetry: a practical guide. Verlag, BerlinGoogle Scholar
  17. Rednikov AY, Zhao H, Sadhal SS, Trinh EH (2006) Steady streaming around a spherical drop displaced from the velocity antinode in an acoustic levitation field. Q J Mech Appl Math 59(3):377–397MathSciNetMATHCrossRefGoogle Scholar
  18. Saha A, Basu S, Suryanarayana C, Kumar R (2010) Experimental analysis of thermo-physical processes in acoustically levitated heated droplets. Int J Heat Mass Transf 53:5663–5674CrossRefGoogle Scholar
  19. Santiago JG, Wereley ST, Meinhart CD, Beebe DJ, Adrian RJ (1998) A particle image velocimetry system for microfluidics. Exp Fluids 25:316–319CrossRefGoogle Scholar
  20. Sazhin SS (2006) Advanced models of fuel droplet heating and evaporation. Prog Energy Combust Sci 32(2):162–214MathSciNetCrossRefGoogle Scholar
  21. Sazhin SS, Sazhina EM, Heikal MR (2000) Modelling of the gas to fuel droplets radiative exchange. Fuel 79:1843–1852CrossRefGoogle Scholar
  22. Scarano F, Riethmuller ML (1999) Iterative multigrid approach in PIV image processing with discrete window offset. Exp Fluids 26:513–523CrossRefGoogle Scholar
  23. Sirignano WA (1999) Fluid dynamics and transport of droplets and sprays. Cambridge University Press, CambridgeCrossRefGoogle Scholar
  24. Tian Y, Apfel R (1996) A novel multiple drop levitator for the study of drop arrays. J Aerosol Sci 27:721–737CrossRefGoogle Scholar
  25. Trinh E, Wang TG (1982) Large-amplitude free and driven drop-shape oscillations: experimental observations. J Fluid Mech 122:316–338CrossRefGoogle Scholar
  26. Wolfe WI, Zissis GJ (1978) The infrared handbook. Office of Naval Research, Department of Navy, Washington DCGoogle Scholar
  27. Xie J, Wei B (2007) Sound field inside acoustically levitated spherical drop. Appl Phys Lett 90:204104.1–204104.3Google Scholar
  28. Yarin AL, Keller J, Pfaffenlehner M, Ryssel E, Tropea C (1997) Flowfield characteristics of an aerodynamic acoustic levitator. Phys Fluids 9:3300–3314CrossRefGoogle Scholar
  29. Yarin A, Pfaffenlehner M, Tropea C (1998) On the acoustic levitation of droplets. J Fluid Mech 356:65–91MathSciNetMATHCrossRefGoogle Scholar
  30. Yarin AL, Brenn G, Kastner O, Tropea C (2002) Drying of acoustically levitated droplets of liquid–solid suspensions: evaporation and crust formation. Phys Fluids 14:2289–2298CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Abhishek Saha
    • 1
  • Saptarshi Basu
    • 2
  • Ranganathan Kumar
    • 1
  1. 1.Department of Mechanical Materials and Aerospace EngineeringUniversity of Central FloridaOrlandoUSA
  2. 2.Department of Mechanical EngineeringIndian Institute of ScienceBangaloreIndia

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