Thermally Mediated Droplet Formation at a Microfluidic T-Junction

Peng Ching Ho, Yit Fatt Yap, Nam Trung Nguyen, John Chee Kiong Chai

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper reports the investigation on the process of thermally mediated droplet formation at a microfluidic T-junction. The temperature field generated by an integrated heater causes changes in properties of the fluids and affects the droplet formation process. The droplet formation process is formulated in this paper as an incompressible immiscible two-phase flow problem. The motion of the two-phases is strongly coupled by interfacial conditions, which are governed by the three-dimensional Navier-Stokes and the energy equations. The interface or the droplet surface is described by a narrow-band particle level-set method. The numerical solutions of the problem are obtained with finite volume method on a staggered mesh and validated with the experiment data on droplet formation in the dripping regime of a T-junction. The combined effect of the temperature-dependent viscosities and interfacial tension of the fluids results in a larger droplet at elevated temperature. The effectiveness of the penetration of temperature field induced by different heater geometries that resulted in different incremental change in droplet size over a temperature range is discussed.

LanguageEnglish
Pages65-75
Number of pages11
JournalMicro and Nanosystems
Volume3
Issue number1
DOIs
Publication statusPublished - Mar 2011
Externally publishedYes

Fingerprint

Microfluidics
Temperature distribution
Fluids
Finite volume method
Two phase flow
Temperature
Surface tension
Viscosity
Geometry
Experiments

Cite this

Ho, Peng Ching ; Yap, Yit Fatt ; Nguyen, Nam Trung ; Chai, John Chee Kiong. / Thermally Mediated Droplet Formation at a Microfluidic T-Junction. In: Micro and Nanosystems. 2011 ; Vol. 3, No. 1. pp. 65-75.
@article{859083ae283146428a146358df57d711,
title = "Thermally Mediated Droplet Formation at a Microfluidic T-Junction",
abstract = "This paper reports the investigation on the process of thermally mediated droplet formation at a microfluidic T-junction. The temperature field generated by an integrated heater causes changes in properties of the fluids and affects the droplet formation process. The droplet formation process is formulated in this paper as an incompressible immiscible two-phase flow problem. The motion of the two-phases is strongly coupled by interfacial conditions, which are governed by the three-dimensional Navier-Stokes and the energy equations. The interface or the droplet surface is described by a narrow-band particle level-set method. The numerical solutions of the problem are obtained with finite volume method on a staggered mesh and validated with the experiment data on droplet formation in the dripping regime of a T-junction. The combined effect of the temperature-dependent viscosities and interfacial tension of the fluids results in a larger droplet at elevated temperature. The effectiveness of the penetration of temperature field induced by different heater geometries that resulted in different incremental change in droplet size over a temperature range is discussed.",
keywords = "Level set method, Microchannels, Microdroplets, Temperature dependency",
author = "Ho, {Peng Ching} and Yap, {Yit Fatt} and Nguyen, {Nam Trung} and Chai, {John Chee Kiong}",
year = "2011",
month = "3",
doi = "10.2174/1876402911103010065",
language = "English",
volume = "3",
pages = "65--75",
journal = "Micro and Nanosystems",
issn = "1876-4029",
publisher = "Bentham Science Publishers B.V.",
number = "1",

}

Thermally Mediated Droplet Formation at a Microfluidic T-Junction. / Ho, Peng Ching; Yap, Yit Fatt; Nguyen, Nam Trung; Chai, John Chee Kiong.

In: Micro and Nanosystems, Vol. 3, No. 1, 03.2011, p. 65-75.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermally Mediated Droplet Formation at a Microfluidic T-Junction

AU - Ho, Peng Ching

AU - Yap, Yit Fatt

AU - Nguyen, Nam Trung

AU - Chai, John Chee Kiong

PY - 2011/3

Y1 - 2011/3

N2 - This paper reports the investigation on the process of thermally mediated droplet formation at a microfluidic T-junction. The temperature field generated by an integrated heater causes changes in properties of the fluids and affects the droplet formation process. The droplet formation process is formulated in this paper as an incompressible immiscible two-phase flow problem. The motion of the two-phases is strongly coupled by interfacial conditions, which are governed by the three-dimensional Navier-Stokes and the energy equations. The interface or the droplet surface is described by a narrow-band particle level-set method. The numerical solutions of the problem are obtained with finite volume method on a staggered mesh and validated with the experiment data on droplet formation in the dripping regime of a T-junction. The combined effect of the temperature-dependent viscosities and interfacial tension of the fluids results in a larger droplet at elevated temperature. The effectiveness of the penetration of temperature field induced by different heater geometries that resulted in different incremental change in droplet size over a temperature range is discussed.

AB - This paper reports the investigation on the process of thermally mediated droplet formation at a microfluidic T-junction. The temperature field generated by an integrated heater causes changes in properties of the fluids and affects the droplet formation process. The droplet formation process is formulated in this paper as an incompressible immiscible two-phase flow problem. The motion of the two-phases is strongly coupled by interfacial conditions, which are governed by the three-dimensional Navier-Stokes and the energy equations. The interface or the droplet surface is described by a narrow-band particle level-set method. The numerical solutions of the problem are obtained with finite volume method on a staggered mesh and validated with the experiment data on droplet formation in the dripping regime of a T-junction. The combined effect of the temperature-dependent viscosities and interfacial tension of the fluids results in a larger droplet at elevated temperature. The effectiveness of the penetration of temperature field induced by different heater geometries that resulted in different incremental change in droplet size over a temperature range is discussed.

KW - Level set method

KW - Microchannels

KW - Microdroplets

KW - Temperature dependency

UR - http://www.scopus.com/inward/record.url?scp=79953774921&partnerID=8YFLogxK

U2 - 10.2174/1876402911103010065

DO - 10.2174/1876402911103010065

M3 - Article

VL - 3

SP - 65

EP - 75

JO - Micro and Nanosystems

T2 - Micro and Nanosystems

JF - Micro and Nanosystems

SN - 1876-4029

IS - 1

ER -