東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Quantification of Internal Droplet M...

Pathak, Saurabh.

Linked to FindBook

Google Book

Amazon

博客來

Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem./
Author:	Pathak, Saurabh.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	247 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
Contained By:	Dissertations Abstracts International82-12B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28582682
ISBN:	9798728266211

Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem.
Pathak, Saurabh.

Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 247 p.

Source: Dissertations Abstracts International, Volume: 82-12, Section: B.

Thesis (Ph.D.)--The University of Akron, 2021.

This item must not be sold to any third party vendors.

The internal behavior of fluid under conditions like natural convection, electro-wetting and coalescence, which are observed in Lab on Chip devices, printing technologies, fluid filtration devices etc., was studied and quantified using the techniques of Particle Image Velocimetry (PIV) through experimental and computational analysis. The experimental analysis was started by a simple case of droplet convection wherein the motion inside the droplet was observed and analyzed using PIV and the particle motion was correlated with the existing engineering models. A computational model was generated using COMSOL multiphysics software to validate the obtained results. The experimental setup was modified to incorporate the physics of Electrowetting (EW). A hypodermic needle was used as an electrode to control the wetting properties of a hydrophobic glass slide by applying an electric potential across the droplet. The experiments were then repeated with changing the electrode orientations from vertical to horizontal with respect to the droplet. The fluid spreading dynamics of the droplet was studied by measuring the particle motion inside the wetting droplet and relating it with its boundary behavior to provide a complete analysis of the same. The observed droplet behavior was compared to a numerical model of an Electrowetting droplet generated using COMSOL multiphysics. The Electrowetting study was urther modified by actuating another droplet along with the original, making them coalesce under the influence of the electric potential. The boundary behavior during coalescence was compared to the naturally driven coalescence of droplets, finding that the electrically driven droplets were faster in actuation velocity and harder to control. The study incorporated the analysis of mixing patterns inside the droplet during coalescence. The experimental results were quantified using PIV and boundary behavior of the droplet after the film drainage was modeled mathematically for further comparison and reasoning. Finally, a mathematical model was formulated for describing the boundary mechanics of droplets during and after coalescence.The research in this dissertation was achieved by utilizing the advanced fluid tracking technology of Particle Image Velocimetry. Although the research on droplets is not new, the tracking of particles inside a droplet placed in an air medium has not been done for all the cases. The behavior of droplets was not exactly replicable as droplet size, the property of the surface in contact with the droplet were never constant and this introduced challenges in the research. The boundary conditions applicable to the droplet during electrowetting were reported and an insight into droplet mechanics during transport by the electrowetting principles was recorded. The processes occurring during coalescence were not properly documented previously because of the fast speeds of droplet coalescence. This dissertation documents the behavior of the newly formed droplet which would prove it to be very helpful in modeling the droplet dynamics during coalescence and contribute to the Lab on Chip development, improvement in filtration techniques and so on.

ISBN: 9798728266211Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Coalescence

Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem.
LDR:04459nmm a2200385 4500 001 2285264
005 20211129124022.5
008 220723s2021 ||||||||||||||||| ||eng d
020 $a 9798728266211
035 $a (MiAaPQ)AAI28582682
035 $a (MiAaPQ)OhioLINKakron1619458988178314
035 $a AAI28582682
040 $a MiAaPQ $c MiAaPQ
100 1 $a Pathak, Saurabh. $3 1297026
245 1 0 $a Quantification of Internal Droplet Motion Using Particle Image Velocimetry for Various Engineering Problem.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 247 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
500 $a Advisor: Garafolo, Nicholas G.
502 $a Thesis (Ph.D.)--The University of Akron, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The internal behavior of fluid under conditions like natural convection, electro-wetting and coalescence, which are observed in Lab on Chip devices, printing technologies, fluid filtration devices etc., was studied and quantified using the techniques of Particle Image Velocimetry (PIV) through experimental and computational analysis. The experimental analysis was started by a simple case of droplet convection wherein the motion inside the droplet was observed and analyzed using PIV and the particle motion was correlated with the existing engineering models. A computational model was generated using COMSOL multiphysics software to validate the obtained results. The experimental setup was modified to incorporate the physics of Electrowetting (EW). A hypodermic needle was used as an electrode to control the wetting properties of a hydrophobic glass slide by applying an electric potential across the droplet. The experiments were then repeated with changing the electrode orientations from vertical to horizontal with respect to the droplet. The fluid spreading dynamics of the droplet was studied by measuring the particle motion inside the wetting droplet and relating it with its boundary behavior to provide a complete analysis of the same. The observed droplet behavior was compared to a numerical model of an Electrowetting droplet generated using COMSOL multiphysics. The Electrowetting study was urther modified by actuating another droplet along with the original, making them coalesce under the influence of the electric potential. The boundary behavior during coalescence was compared to the naturally driven coalescence of droplets, finding that the electrically driven droplets were faster in actuation velocity and harder to control. The study incorporated the analysis of mixing patterns inside the droplet during coalescence. The experimental results were quantified using PIV and boundary behavior of the droplet after the film drainage was modeled mathematically for further comparison and reasoning. Finally, a mathematical model was formulated for describing the boundary mechanics of droplets during and after coalescence.The research in this dissertation was achieved by utilizing the advanced fluid tracking technology of Particle Image Velocimetry. Although the research on droplets is not new, the tracking of particles inside a droplet placed in an air medium has not been done for all the cases. The behavior of droplets was not exactly replicable as droplet size, the property of the surface in contact with the droplet were never constant and this introduced challenges in the research. The boundary conditions applicable to the droplet during electrowetting were reported and an insight into droplet mechanics during transport by the electrowetting principles was recorded. The processes occurring during coalescence were not properly documented previously because of the fast speeds of droplet coalescence. This dissertation documents the behavior of the newly formed droplet which would prove it to be very helpful in modeling the droplet dynamics during coalescence and contribute to the Lab on Chip development, improvement in filtration techniques and so on.
590 $a School code: 0003.
650 4 $a Physics. $3 516296
650 4 $a Mechanical engineering. $3 649730
650 4 $a Computer engineering. $3 621879
650 4 $a Fluid mechanics. $3 528155
653 $a Coalescence
653 $a Experimental Fluid Dynamics
653 $a Particle Image Velocimetry
653 $a Electrowetting
690 $a 0605
690 $a 0548
690 $a 0464
690 $a 0204
710 2 $a The University of Akron. $b Mechanical Engineering. $3 2094131
773 0 $t Dissertations Abstracts International $g 82-12B.
790 $a 0003
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28582682