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博碩士論文 etd-0715118-075643 詳細資訊
Title page for etd-0715118-075643
論文名稱
Title
應用μPIV/μLIF於呼吸式微型直接甲醇燃料電池組中熱場、流場及濃度場之觀測與量測
Flow Channel Visualization and Velocity/Temperature/Concentration Measurements of an Air-breathing Micro Direct Methanol Fuel Cell Stack
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
133
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2018-07-10
繳交日期
Date of Submission
2018-08-15
關鍵字
Keywords
溫度場、濃度場、速度場、微型直接甲醇燃料電池組、微質點影像測速儀、雷射誘發微螢光
concentration field, μPIV, μLIF, velocity field, DMFC stack, temperature field
統計
Statistics
本論文已被瀏覽 5659 次,被下載 98
The thesis/dissertation has been browsed 5659 times, has been downloaded 98 times.
中文摘要
在當今能源逐漸短缺、環保意識抬頭、溫室效應日趨嚴重之際,諸多新型替代能源及相關科技在近年持續受到重視,其中之一的燃料電池在不同面向被廣泛地探討與研究;而本研究著重於呼吸式微型直接甲醇燃料電池,利用實驗觀測、量測方法,分別探討單顆電池及電池組中流場、熱場、濃度場的現象及其與性能表現的關係。
實驗中,透過微質點影像測速儀(μPIV)及雷射誘發螢光(μLIF)的光學量測方法,建立了陰極呼吸式微型直接甲醇燃料電池中陽極流場、溫度場及濃度場的分布,並且達到光學觀測與性能量測同步執行的目標。
實驗結果除了得到串聯雙顆電池組有高達61.73mW/cm2的功率輸出外,電化學反應產生的二氧化碳氣泡及因流場分離所產生的渦流現象也得以明確觀察;最後,透過計算與分析進一步得到了雷諾數(Re)分別與摩擦係數(f)、紐塞數(Nu)及雪伍德數(Sh)間的關係式,同時驗證了對流熱傳與對流質傳現象之間的高度相關性。
由本研究的結論可知,電池組若以類似方式連結更多單電池時,其電池組整體性能與各別電池的性能,甚至動量、熱量及質量傳遞上的效應皆可被預測,同時能夠提供未來相關研究上的設計參考,以改善微型直接甲醇燃料電池在各方面的實踐與應用。
Abstract
Due to the environmental issues have been concerned recently, much research about the fuel cells is widely discussed in various aspects; this study focuses on observations of the flow field, temperature field, and concentration field in an air-breathing direct methanol fuel cell stack, and their relationship with the performance.
In this experiment, the distribution of momentum, heat, and mass transfer were established through the optical measurement method of μPIV and μLIF, and the objective of simultaneous for optical observation and performance measurement was achieved.
From the experimental data, we obtained that the 2-cell stack had the power output up to 61.73mW/cm2; the CO2 bubbles and the vortex were also observed during operating. Further, the correlation of the Reynolds number (Re) with the friction factor (f), the Nusselt number (Nu), and the Sherwood number (Sh) are also obtained.
By the conclusion, if the stack is constructed similarly by two or more cells, the influence of momentum, heat, and mass transfer, even the performance can be expected. That would provide a conception for design and further improve the application of micro direct methanol fuel cell stacks.
目次 Table of Contents
[論文審定書+i]
[論文公開授權書+ii]
[誌謝+iii]
[中文摘要+iv]
[ABSTRACT+v]
[CONTENTS+vi]
[LIST OF FIGURES+viii]
[LIST OF TABLES+x]
[NOMENCLATURE+xi]
[CHAPTER 1 INTRODUCTION+1]
[1.1 Background+1]
[1.2 Classification of fuel cells+3]
[1.3 Literature review+6]
[1.4 Objective and motivation +15]
[CHAPTER 2 PRINCIPLE, COMPONENTS, AND DESIGN+19]
[2.1 Principle of DMFC+19]
[2.2 Main components+20]
[2.3 Design and assembly+26]
[CHAPTER 3 EXPERIMENTAL APPARATUS AND PROCEDURE+39]
[3.1 Experimental apparatus+39]
[3.2 Experimental procedure+43]
[3.3 Synchronization of the measurements+47]
[CHAPTER 4 THEOREM+57]
[4.1 Parameters in the velocity field+57]
[4.2 Parameters in the temperature field+58]
[4.3 Parameters in the concentration field+60]
[CHAPTER 5 UNCERTAINTY ANALYSIS+63]
[CHAPTER 6 RESULTS AND DISCUSSIONS+67]
[6.1 Performance test+67]
[6.2 Optical measurements+69]
[CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS+101]
[7.1 Conclusions+101]
[7.2 Recommendation for future prospect+104]
[REFERENCE+105]
[APPENDIX A+115]
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