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Evaluation of Free-floating Droplet ...

Vang, Chang Lee.

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Evaluation of Free-floating Droplet Acceleration in ISS Droplet Combustion Experiments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evaluation of Free-floating Droplet Acceleration in ISS Droplet Combustion Experiments./
作者:	Vang, Chang Lee.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	42 p.
附註:	Source: Masters Abstracts International, Volume: 82-02.
Contained By:	Masters Abstracts International82-02.
標題:	Fluid mechanics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27998987
ISBN:	9798664725728

Evaluation of Free-floating Droplet Acceleration in ISS Droplet Combustion Experiments.
Vang, Chang Lee.

Evaluation of Free-floating Droplet Acceleration in ISS Droplet Combustion Experiments. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 42 p.

Source: Masters Abstracts International, Volume: 82-02.

Thesis (M.S.)--University of California, Davis, 2020.

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

Trajectories of free-floating droplets burned in experiments on the International Space Station (ISS) are evaluated from digital images. Ideally, the experiments are designed such that droplets would burn in a spherical configuration (e.g. with a spherical flame). However, it was observed that burning droplets can move in highly irregular paths which destroy this spherical geometry. n-Heptane droplets are observed to move in irregular paths after cool flame extinction with acceleration levels of tens or hundreds of micro-g and acceleration frequencies of 0.2-0.3 Hz. Oscillations in the flame of burning methanol and n-heptane droplets can affect droplet acceleration components. During flame oscillation, droplets exhibit oscillatory acceleration patterns with characteristic frequencies of 0.2-0.3 Hz and accelerations of the order of 50 micro-g. The droplet acceleration magnitudes are significantly larger than measured ISS acceleration levels (g-jitter). It is concluded that motions of free droplets are initially a result of the deployment and ignition processes, while motions later in droplet lifetimes are a result of interactions between the droplets and the gas phase including influences of thermal and solutal Marangoni stresses at the liquid-gas interface. The study of droplet migration is of fundamental interest to droplet combustion, and may also have significance to certain material and biological processing applications. The research also shows that droplet migration is an important factor to consider in future droplet combustion experiment designs.

ISBN: 9798664725728Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

Droplet combustion

Evaluation of Free-floating Droplet Acceleration in ISS Droplet Combustion Experiments.
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500 $a Source: Masters Abstracts International, Volume: 82-02.
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520 $a Trajectories of free-floating droplets burned in experiments on the International Space Station (ISS) are evaluated from digital images. Ideally, the experiments are designed such that droplets would burn in a spherical configuration (e.g. with a spherical flame). However, it was observed that burning droplets can move in highly irregular paths which destroy this spherical geometry. n-Heptane droplets are observed to move in irregular paths after cool flame extinction with acceleration levels of tens or hundreds of micro-g and acceleration frequencies of 0.2-0.3 Hz. Oscillations in the flame of burning methanol and n-heptane droplets can affect droplet acceleration components. During flame oscillation, droplets exhibit oscillatory acceleration patterns with characteristic frequencies of 0.2-0.3 Hz and accelerations of the order of 50 micro-g. The droplet acceleration magnitudes are significantly larger than measured ISS acceleration levels (g-jitter). It is concluded that motions of free droplets are initially a result of the deployment and ignition processes, while motions later in droplet lifetimes are a result of interactions between the droplets and the gas phase including influences of thermal and solutal Marangoni stresses at the liquid-gas interface. The study of droplet migration is of fundamental interest to droplet combustion, and may also have significance to certain material and biological processing applications. The research also shows that droplet migration is an important factor to consider in future droplet combustion experiment designs.
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