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

A Numerical Investigation of Microgr...

Ringle, Daniel Peter.

Linked to FindBook

Google Book

Amazon

博客來

A Numerical Investigation of Microgravity Evaporation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Numerical Investigation of Microgravity Evaporation./
Author:	Ringle, Daniel Peter.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	74 p.
Notes:	Source: Masters Abstracts International, Volume: 81-12.
Contained By:	Masters Abstracts International81-12.
Subject:	Fluid mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27740613
ISBN:	9798645466206

A Numerical Investigation of Microgravity Evaporation.
Ringle, Daniel Peter.

A Numerical Investigation of Microgravity Evaporation. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 74 p.

Source: Masters Abstracts International, Volume: 81-12.

Thesis (M.S.)--Portland State University, 2020.

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

Evaporation is important to myriad engineering processes such as cooling, distillation, thin film deposition, and others. In fact, NASA has renewed interest in using cabin air pressure evaporation as a means to recycle waste water in space. As one example, NASA recently conducted experiments aboard the International Space Station (ISS) to measure evaporation rates in microgravity and to determine the impacts of porous structure on the process. It has long been assumed that differences in evaporation rates between 1-g0 and microgravity are small. However, discrepancies by as much as 40% have been observed in practice. The assumption now is that such differences are not only due to a lack of buoyancy in the vapor phase in microgravity (10-6 g0), but also to pore geometries, wetting conditions, and airflow. Numerical models are developed herein to assess the viability of Star CCM+ as a CFD tool to accurately model such phenomena, as well as to identify what mechanisms are responsible for the difference observed in practice between 1-g0 and microgravity. The code is benchmarked via comparisons to Stefan Tube analytical solutions with agreement to within approximately ±1%. Accounting for pore geometry, comparisons to NASA ISS flight data yields results accurate to ±14%. Additionally, the analytical solution to the Stefan Tube is weighted for both the actual free surface area and contact line length yielding results accurate to 4.4% and 6.1% depending on pore geometry.The CFD models are able to identify the mechanisms responsible for the effects of microgravity on the rate of evaporation and it is shown that these effects can be minimized and even wholly negated by sufficiently high airflow velocity.

ISBN: 9798645466206Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

CFD

A Numerical Investigation of Microgravity Evaporation.
LDR:02826nmm a2200373 4500 001 2273316
005 20201109125217.5
008 220629s2020 ||||||||||||||||| ||eng d
020 $a 9798645466206
035 $a (MiAaPQ)AAI27740613
035 $a AAI27740613
040 $a MiAaPQ $c MiAaPQ
100 1 $a Ringle, Daniel Peter. $3 3550753
245 1 0 $a A Numerical Investigation of Microgravity Evaporation.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 74 p.
500 $a Source: Masters Abstracts International, Volume: 81-12.
500 $a Advisor: Weislogel, Mark.
502 $a Thesis (M.S.)--Portland State University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Evaporation is important to myriad engineering processes such as cooling, distillation, thin film deposition, and others. In fact, NASA has renewed interest in using cabin air pressure evaporation as a means to recycle waste water in space. As one example, NASA recently conducted experiments aboard the International Space Station (ISS) to measure evaporation rates in microgravity and to determine the impacts of porous structure on the process. It has long been assumed that differences in evaporation rates between 1-g0 and microgravity are small. However, discrepancies by as much as 40% have been observed in practice. The assumption now is that such differences are not only due to a lack of buoyancy in the vapor phase in microgravity (10-6 g0), but also to pore geometries, wetting conditions, and airflow. Numerical models are developed herein to assess the viability of Star CCM+ as a CFD tool to accurately model such phenomena, as well as to identify what mechanisms are responsible for the difference observed in practice between 1-g0 and microgravity. The code is benchmarked via comparisons to Stefan Tube analytical solutions with agreement to within approximately ±1%. Accounting for pore geometry, comparisons to NASA ISS flight data yields results accurate to ±14%. Additionally, the analytical solution to the Stefan Tube is weighted for both the actual free surface area and contact line length yielding results accurate to 4.4% and 6.1% depending on pore geometry.The CFD models are able to identify the mechanisms responsible for the effects of microgravity on the rate of evaporation and it is shown that these effects can be minimized and even wholly negated by sufficiently high airflow velocity.
590 $a School code: 0180.
650 4 $a Fluid mechanics. $3 528155
650 4 $a Mechanical engineering. $3 649730
653 $a CFD
653 $a Computational fluid Dynamics
653 $a Evaporation
653 $a Star CCM+
653 $a VOF
653 $a Volume of fluid
690 $a 0204
690 $a 0548
710 2 $a Portland State University. $b Mechanical Engineering. $3 3191308
773 0 $t Masters Abstracts International $g 81-12.
790 $a 0180
791 $a M.S.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27740613