Evaporation of water droplets under the enhanced gas concentration surrounding

The evaporation of water droplet is a fundamental yet complex process in our nature after taking in all physical considerations. The study is beneficial in many industrial applications such as microelectronics, ink jet printing, cooling systems etc. Till today, the whole process of evaporation of a...

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Main Author: Tan, Gary Zhao Quan
Other Authors: Fei Duan
Format: Final Year Project
Language:English
Published: 2015
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Online Access:http://hdl.handle.net/10356/63647
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-636472023-03-04T18:28:23Z Evaporation of water droplets under the enhanced gas concentration surrounding Tan, Gary Zhao Quan Fei Duan School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics DRNTU::Engineering::Mechanical engineering::Energy conservation The evaporation of water droplet is a fundamental yet complex process in our nature after taking in all physical considerations. The study is beneficial in many industrial applications such as microelectronics, ink jet printing, cooling systems etc. Till today, the whole process of evaporation of a droplet has yet to be well understood in the academic world. The accumulated change of carbon dioxide results in a non-uniform water evaporation and condensation in our environment. In a previous study on a steady-state evaporation of water droplets, the interfacial liquid and vapor temperature were found to be not the same. Convection at the droplet interface also affected evaporation. Hence in the present study, a steady-state evaporation experiment will be extended to the evaporation of sessile water droplet under the controlled conditions including gas concentration, pressure and temperature.In the early stages of the project, a detailed literature review on the theory and experimental techniques of droplet evaporation were studied for a better understanding of the project’s field of study. Following that, substantial amount of time was invested into fabrication and setting up of the experimental rig. Lastly, a series of evaporation experiments were conducted by varying the pressure in the vacuum chamber or substrate temperature while maintaining the other factor constant at any one time in nitrogen filled conditions. The data collected was analyzed and verified by the Statistical Rate Theory (SRT). Based on the data collected from the experiments, it may be concluded that there was observable temperature non-uniformity between the vapor phase temperature and liquid phase temperature of an evaporating droplet along its vertical axis at any point of the droplet. The temperatures at the apex of the droplet in the liquid phase were also found to be higher than what was measured at the point close to the contact line. The relative humidity calculated based on the predicted vapor pressure computed with the SRT approach appears to support the experimental data gathered. Future works aims to explore this area of study with the use of a variety of surrounding gases, pressure levels and substrate temperatures. Bachelor of Engineering (Mechanical Engineering) 2015-05-18T03:25:23Z 2015-05-18T03:25:23Z 2015 2015 Final Year Project (FYP) http://hdl.handle.net/10356/63647 en Nanyang Technological University 88 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
DRNTU::Engineering::Mechanical engineering::Energy conservation
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
DRNTU::Engineering::Mechanical engineering::Energy conservation
Tan, Gary Zhao Quan
Evaporation of water droplets under the enhanced gas concentration surrounding
description The evaporation of water droplet is a fundamental yet complex process in our nature after taking in all physical considerations. The study is beneficial in many industrial applications such as microelectronics, ink jet printing, cooling systems etc. Till today, the whole process of evaporation of a droplet has yet to be well understood in the academic world. The accumulated change of carbon dioxide results in a non-uniform water evaporation and condensation in our environment. In a previous study on a steady-state evaporation of water droplets, the interfacial liquid and vapor temperature were found to be not the same. Convection at the droplet interface also affected evaporation. Hence in the present study, a steady-state evaporation experiment will be extended to the evaporation of sessile water droplet under the controlled conditions including gas concentration, pressure and temperature.In the early stages of the project, a detailed literature review on the theory and experimental techniques of droplet evaporation were studied for a better understanding of the project’s field of study. Following that, substantial amount of time was invested into fabrication and setting up of the experimental rig. Lastly, a series of evaporation experiments were conducted by varying the pressure in the vacuum chamber or substrate temperature while maintaining the other factor constant at any one time in nitrogen filled conditions. The data collected was analyzed and verified by the Statistical Rate Theory (SRT). Based on the data collected from the experiments, it may be concluded that there was observable temperature non-uniformity between the vapor phase temperature and liquid phase temperature of an evaporating droplet along its vertical axis at any point of the droplet. The temperatures at the apex of the droplet in the liquid phase were also found to be higher than what was measured at the point close to the contact line. The relative humidity calculated based on the predicted vapor pressure computed with the SRT approach appears to support the experimental data gathered. Future works aims to explore this area of study with the use of a variety of surrounding gases, pressure levels and substrate temperatures.
author2 Fei Duan
author_facet Fei Duan
Tan, Gary Zhao Quan
format Final Year Project
author Tan, Gary Zhao Quan
author_sort Tan, Gary Zhao Quan
title Evaporation of water droplets under the enhanced gas concentration surrounding
title_short Evaporation of water droplets under the enhanced gas concentration surrounding
title_full Evaporation of water droplets under the enhanced gas concentration surrounding
title_fullStr Evaporation of water droplets under the enhanced gas concentration surrounding
title_full_unstemmed Evaporation of water droplets under the enhanced gas concentration surrounding
title_sort evaporation of water droplets under the enhanced gas concentration surrounding
publishDate 2015
url http://hdl.handle.net/10356/63647
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