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博碩士論文 etd-0714118-142732 詳細資訊
Title page for etd-0714118-142732
論文名稱
Title
具軸向熱傳導之平滑/粗糙微渠道流之熱傳特性分析
Convective Heat Transfer Analysis of Smooth/Roughened Microchannels with Axial Heat Conduction Effect
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
69
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
2018-08-14
關鍵字
Keywords
微渠道之熱傳增強、微結構阻塊、低雷諾數、不具相變化之流動、軸向熱傳現象、白金漢π、因次分析
Heat transfer enhancement, Microchannels, Microstructure, Micro-pin fins, Dimensional analysis, Buckingham pi theorem
統計
Statistics
本論文已被瀏覽 5669 次,被下載 21
The thesis/dissertation has been browsed 5669 times, has been downloaded 21 times.
中文摘要
本研究將實驗數據藉由因次分析,利用白金漢π定理來推導出實驗相關式,並探討先關參數對微渠道熱場之影響,進行分析及計算。由先前的實驗得知,在微渠道中加入微結構阻塊後,其熱傳能力有所提升,且得出在具有方形阻塊之微渠道有最佳的熱傳效益,其最多能提高至7-9%。然而由實驗結果所獲得的熱傳增強效益並不顯著,因此從實驗中觀察發現有軸向熱傳導的產生。並進一步了解及研究軸向熱傳導現象對微渠道之影響,且透過計算在理想絕熱環境中,若無軸向熱傳導現象發生,且假設實驗中用來產生軸向熱傳導的熱,全部都由水吸收帶走,其假設結果透過計算,所得到的熱傳增強效益便可提高至9-11%。而經由分析得知,在平滑微渠道與五種不同形狀阻塊的微渠道中,方形阻塊的軸向熱傳導較大,且經由修正後其熱傳增強效益亦為最佳。在研究過程中發現,在實際實驗中,軸向熱傳導現象造成實驗熱傳效益的減少,然而軸向熱傳導不單只是依據軸向熱傳導係數決定,另一個決定的重要因素是溫度梯度比值,根據其他文獻研究發現,溫度梯度也是一個重要參考指標,當溫度梯度比值越大,所產生的軸向熱傳導現象也越大。因此計算出實驗的溫度梯度比值,發現在雷諾數越小時,其溫度梯度比值較大,也代表著在雷諾數越小時,微渠道所受到來自軸向熱傳現象的影響也越大。總結軸向熱傳導係數及溫度梯度比值之研究結果發現,在雷諾數越小的情況下,其軸向熱傳導的影響較為明顯,且此影響也發生在有微結構阻塊之微渠道中。
Abstract
This study aims to derive experimental formula in advantage of dimensional analysis and explore the related parameter influence on microchannel thermal field to analyze and calculate. Nevertheless, the heat transfer effect of the previous experiment is not obvious. Axial heat conduction had been found in the experiment. By further realizing and studying axial heat conduction influence on microchannel, we calculated the data of the heat transfer enhancement in axial heat conduction. Under the condition of the thermal insulation environment, if there is no axial heat conduction occurring, and the heat which generate by axial heat conduction in the experiment was absorbed by water, the hypothesis of heat transfer enhancement can be increased. In the microchannel of the smooth microchannel and the five different shape pin fins, the axial heat conduction of the square pin fin is larger, and the heat transfer enhancement benefit is also optimized by the correction. In the experiment, axial heat conduction resulted to the decline of the experimental heat transfer enhancement had been noted. Axial heat conduction is not only controlled by axial conduction number, but also by another important cause, temperature gradient ratio. The bigger the temperature gradient ratio is, the bigger the axial heat conduction will be. When calculating experimental temperature gradient ratio, we found that the smaller the Reynolds number is, the bigger the temperature gradient ratio will be. When calculating experimental temperature gradient ratio, we found that the smaller the Reynolds number is, the bigger the temperature gradient ratio will be. To sum up the research result of the axial conduction number and temperature gradient ratio, under the condition of the smaller Reynolds number, the impact of the axial heat conduction will be obvious, which also happen in the microchannel with micro pin fins.
目次 Table of Contents
論文審定書 i
致謝 ii
中文摘要 iii
ABSTRACT iv
CONTENTS v
List of Figure vii
List of Table x
CHAPTER 1 INTRODUCTION 1
1.1 Literature review 2
1.1.1 Micro-pin fin in microchannel 2
1.1.2 Low Reynolds number in microchannel 6
1.1.3 Axial conduction 7
1.2 The objective of this study 10
1.3 Thesis scope 11
CHAPTER 2 DESIGN AND METHODULOGY 12
2.1 Model Design 12
2.2 The theoretical analysis of temperature filed 12
2.2.1 Heat transfer analysis 13
2.2.2 The average Heat transfer coefficient and Nusselt number 13
2.2.3 The theoretical analysis of flow filed 14
CHAPTER 3 THEORETICAL ANALYSIS 17
3.1 Buckingham Pi theorem 17
3.1.1 Buckingham Pi of smooth microchannels 17
3.1.2 Buckingham Pi of roughness microchannels 18
3.2 Dimensional analysis 20
3.2.1 Reynolds number 20
3.2.2 Prandtl number 20
3.2.3 Nusselt number 21
3.2.4 Hydraulic diameter 21
3.2.5 Biot number 21
3.2.6 Axial conduction number 22
CHAPTER 4 RESULTS AND DISCUSSION 24
4.1 The temperature of microchannels 24
4.2 Axial conduction number and temperature gradient number distribution 25
4.3 Local heat transfer coefficient and Nusselt number distribution 26
4.4 Heat transfer enhancement ratio 26
4.5 Compare with other paper 27
4.6 The correlation of microchannels 27
4.6.1 Correlation of smooth microchannels 27
4.6.2 Correlation of roughness microchannels 28
CHAPTER 5 CONCLUSIONS 47
REFERENCES 48
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