Experimental analyses of surface oscillations are reported in acoustically levitated, radiatively heated bicomponent droplets with one volatile and other being nonvolatile. Two instability pathways are observed: one being acoustically driven observed in low-vapor pressure fluid droplets and other being boiling driven observed in high-vapor pressure fluid droplets. The first pathway shows extreme droplets deformation and subsequent breakup by acoustic pressure and externally supplied heat. Also transition of instabilities from acoustically activated shape distortion regime to thermally induced boiling regime is observed with increasing concentration of volatile component in bicomponent droplets. Precursor phases of instabilities are investigated using Legendre’s polynomial.
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December 2015
This article was originally published in
Journal of Heat Transfer
Research-Article
Experimental Study of Shape Transition in an Acoustically Levitated and Externally Heated Droplet
Binita Pathak,
Binita Pathak
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: binitapathak88@gmail.com
Indian Institute of Science,
Bangalore 560012, India
e-mail: binitapathak88@gmail.com
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Apratim Sanyal,
Apratim Sanyal
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: sanyal6ap@gmail.com
Indian Institute of Science,
Bangalore 560012, India
e-mail: sanyal6ap@gmail.com
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Saptarshi Basu
Saptarshi Basu
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: sbasu@mecheng.iisc.ernet.in
Indian Institute of Science,
Bangalore 560012, India
e-mail: sbasu@mecheng.iisc.ernet.in
Search for other works by this author on:
Binita Pathak
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: binitapathak88@gmail.com
Indian Institute of Science,
Bangalore 560012, India
e-mail: binitapathak88@gmail.com
Apratim Sanyal
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: sanyal6ap@gmail.com
Indian Institute of Science,
Bangalore 560012, India
e-mail: sanyal6ap@gmail.com
Saptarshi Basu
Mechanical Engineering Department,
Indian Institute of Science,
Bangalore 560012, India
e-mail: sbasu@mecheng.iisc.ernet.in
Indian Institute of Science,
Bangalore 560012, India
e-mail: sbasu@mecheng.iisc.ernet.in
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 30, 2014; final manuscript received October 30, 2014; published online August 11, 2015. Assoc. Editor: Suman Chakraborty.
J. Heat Transfer. Dec 2015, 137(12): 121006 (8 pages)
Published Online: August 11, 2015
Article history
Received:
April 30, 2014
Revision Received:
October 30, 2014
Citation
Pathak, B., Sanyal, A., and Basu, S. (August 11, 2015). "Experimental Study of Shape Transition in an Acoustically Levitated and Externally Heated Droplet." ASME. J. Heat Transfer. December 2015; 137(12): 121006. https://doi.org/10.1115/1.4030922
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