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A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube

In this paper, we numerically investigate the dynamics of a compound droplet driven by surface tension variation induced by a thermal gradient in a sinusoidal constriction tube. Initially, the compound droplet with a concentric inner core is spherical and placed in the constriction's upstream r...

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Main Authors:	Vinh, Nguyen, Truong, Van, Phan, Nguyen, Hoe, Nguyen, Binh, Pham, Hung, Vu
Format:	Bài trích
Language:	English
Published:	The American Society of Mechanical Engineers 2022
Subjects:	Dynamics High temperature
Online Access:	https://asmedigitalcollection.asme.org/fluidsengineering/article-abstract/doi/10.1115/1.4054229/1139884/A-Compound-Droplet-Undergoing-Thermocapillary?redirectedFrom=fulltext https://dlib.phenikaa-uni.edu.vn/handle/PNK/5779 https://doi.org/10.1115/1.4054229
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spelling	oai:localhost:PNK-57792022-08-17T05:54:54Z A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube Vinh, Nguyen Truong, Van Phan, Nguyen Hoe, Nguyen Binh, Pham Hung, Vu Dynamics High temperature In this paper, we numerically investigate the dynamics of a compound droplet driven by surface tension variation induced by a thermal gradient in a sinusoidal constriction tube. Initially, the compound droplet with a concentric inner core is spherical and placed in the constriction's upstream region with a low temperature. As time progresses, it migrates to the downstream with a high temperature. Due to the constriction, the droplet is slowed down in the upstream region and accelerated again right after passing the constriction. This acceleration maximizes the eccentricity. However, the constriction results in an increase in the maximum eccentricity when increasing its depth to a value corresponding to the size of the tube neck, which is greater than or equal to the droplet size. Effects of various parameters, e.g., the Marangoni number Ma, the capillary number Ca and the radius ratio Rio, are studied. It is found out that increasing the Ma number or decreasing the Ca number reduces the maximum eccentricity and prolongs the travel time, i.e., the arrival time, from the upstream to the downstream. Similar reduction in the maximum eccentricity also occurs with the increased Rio ratio. Effects of these parameters on the migration velocity are also revealed 2022-05-05T07:26:25Z 2022-05-05T07:26:25Z 2022 Bài trích https://asmedigitalcollection.asme.org/fluidsengineering/article-abstract/doi/10.1115/1.4054229/1139884/A-Compound-Droplet-Undergoing-Thermocapillary?redirectedFrom=fulltext https://dlib.phenikaa-uni.edu.vn/handle/PNK/5779 https://doi.org/10.1115/1.4054229 en The American Society of Mechanical Engineers
institution	Digital Phenikaa
collection	Digital Phenikaa
language	English
topic	Dynamics High temperature
spellingShingle	Dynamics High temperature Vinh, Nguyen Truong, Van Phan, Nguyen Hoe, Nguyen Binh, Pham Hung, Vu A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
description	In this paper, we numerically investigate the dynamics of a compound droplet driven by surface tension variation induced by a thermal gradient in a sinusoidal constriction tube. Initially, the compound droplet with a concentric inner core is spherical and placed in the constriction's upstream region with a low temperature. As time progresses, it migrates to the downstream with a high temperature. Due to the constriction, the droplet is slowed down in the upstream region and accelerated again right after passing the constriction. This acceleration maximizes the eccentricity. However, the constriction results in an increase in the maximum eccentricity when increasing its depth to a value corresponding to the size of the tube neck, which is greater than or equal to the droplet size. Effects of various parameters, e.g., the Marangoni number Ma, the capillary number Ca and the radius ratio Rio, are studied. It is found out that increasing the Ma number or decreasing the Ca number reduces the maximum eccentricity and prolongs the travel time, i.e., the arrival time, from the upstream to the downstream. Similar reduction in the maximum eccentricity also occurs with the increased Rio ratio. Effects of these parameters on the migration velocity are also revealed
format	Bài trích
author	Vinh, Nguyen Truong, Van Phan, Nguyen Hoe, Nguyen Binh, Pham Hung, Vu
author_facet	Vinh, Nguyen Truong, Van Phan, Nguyen Hoe, Nguyen Binh, Pham Hung, Vu
author_sort	Vinh, Nguyen
title	A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
title_short	A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
title_full	A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
title_fullStr	A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
title_full_unstemmed	A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube
title_sort	compound droplet undergoing thermocapillary migration passing through a constricted tube
publisher	The American Society of Mechanical Engineers
publishDate	2022
url	https://asmedigitalcollection.asme.org/fluidsengineering/article-abstract/doi/10.1115/1.4054229/1139884/A-Compound-Droplet-Undergoing-Thermocapillary?redirectedFrom=fulltext https://dlib.phenikaa-uni.edu.vn/handle/PNK/5779 https://doi.org/10.1115/1.4054229
_version_	1751856315488010240
score	8.881002

A Compound Droplet Undergoing Thermocapillary Migration Passing Through a Constricted Tube

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