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研究生:林鉍研
研究生(外文):Pi-Yen Lin
論文名稱:暫態液晶量測垂直腔體內低速衝擊流之熱傳研究
論文名稱(外文):Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
指導教授:楊儒楊儒引用關係
指導教授(外文):Ru Yang
學位類別:碩士
校院名稱:國立中山大學
系所名稱:機械與機電工程學系研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:57
中文關鍵詞:液晶測溫技術暫態技術衝擊冷卻
外文關鍵詞:transient techniqueJet impingementliquid crystals technique
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摘要
衝擊冷卻是一種強化熱傳技術。本論文的結果在探討受衝擊流的熱傳係數,以分析衝擊面之熱傳性能。實驗方法是利用暫態液晶量測技術來量測衝擊面的局部熱傳係數。
液晶測溫技術是利用感熱液晶隨溫度變化而迅速改變反射光顏色的特性,應用影像處理系統來測定表面場溫度分佈的一種新型測溫技術。具有定量溫度數據的量測和定性感熱圖像顯示之雙重功能,能夠用於一些傳統點測溫度無法研究的複雜熱傳問題。
本論文研究的目的是建立一套暫態液晶量測系統,利用暫態液晶量測技術對於在垂直圓柱容器內低速空氣噴流衝擊至一水平圓盤所產生的熱傳效益進行研究。其實驗參數範圍為0.5<分離距(H/D )<3.5和500 <雷諾數(Re)< 1500。
其結果顯示在不同雷諾數與分離距下量測之熱傳係數分佈面所求得的面積平均Nusselt number, 經回歸分析,推導出可同時評估雷諾數與分離距個別及偶合效應之熱傳係數實驗公式。
Abstract
Jet impingement heat transfer is an enhanced heat transfer technique.This article reports results on the local heat transfer coefficients for confined impinging air jet.A transient thermochromatic liquid crystals technique is used to visualize and record isotherms on an impingement surface.

Quantitative temperature measurement using thermochromatic liquid crystals is a field temperature measurement technique. It utilizes the feature that TLCs change their reflex light colors with variation of temperature and apply an image capturing and processing system to calibrate the characteristic curve of TLCs colour-temperature,and then use it to measure the distribution of surface temperature. Therefore , it can solve some problem that cannot be solved by traditional point Temperature measuring methods in heat transfer field.

The main object of this articale is to set up a temperature measurement system of transient thermochromatic liquid crystals. Furthermore, an experimental is carried out in the present study to investigate the characteristics of heat transfer resulting from a low speed air jet impinging onto a horizontal circular disk confined in a vertical adiabatic cylindrical chamber. Experiments are conducted at low nozzle-to-disc spacing (0.5<H/D <3.5) and Reynolds number in the range of500 to 1500 for
two different injection pips.

The results show that the effects of Reynolds number and nozzle-to-disc spacing on the local heat-transfer coefficient are reported and compared with different diameter of injection pipes.Finally , empirical equations are proposed to correlate the effect of Reynolds number and nozzle-to-disc spacing .
目錄(Table of Contents)

圖目錄(List of fiures)
表目錄(List of tables)
學術用語(Nomenclature)
摘要(Abstract)
章節 頁數

第一章 前言 (Introduction) 1

1-1 研究背景(Background) 1

1-2 文獻回顧(Literature review) 4

1-3 研究內容(Scope of Present Study) 9

第二章 實驗詳述(Experimental details) 1 0

2-1 實驗設備(Experimental apparatus) 1 0

2-2 實驗規劃(Experimental program ) 1 4

2-3 實驗流程(Experimental procedures) 2 5

第三章 結果與討論(Results and discussion) 2 6

3-1噴嘴直徑對熱傳之影響(Impacts of different sizes of nozzle ) 2 6

3-2分離距和雷諾數之影響(Isolated H/D and Re effects ) 2 8

3-3 旋轉雷諾數效應(Rotational Reynolds number effects) 2 9

3-4熱傳實驗公式(Experimental heat transfer correlations) 3 0

第四章 結論(Conclusions) 3 1

第五章 不準度分析(Uncertainty analysis) 3 2

參考文獻 (Reference) 3 4
參考文獻(References)

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