Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 92 === 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 r...

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Main Authors: Pi-Yen Lin, 林鉍研
Other Authors: Ru Yang
Format: Others
Language:zh-TW
Published: 2004
Online Access:http://ndltd.ncl.edu.tw/handle/26998804811759666908
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spelling ndltd-TW-092NSYS54900402015-10-13T13:05:09Z http://ndltd.ncl.edu.tw/handle/26998804811759666908 Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber 暫態液晶量測垂直腔體內低速衝擊流之熱傳研究 Pi-Yen Lin 林鉍研 碩士 國立中山大學 機械與機電工程學系研究所 92 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 . Ru Yang 楊儒 2004 學位論文 ; thesis 57 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 92 === 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 .
author2 Ru Yang
author_facet Ru Yang
Pi-Yen Lin
林鉍研
author Pi-Yen Lin
林鉍研
spellingShingle Pi-Yen Lin
林鉍研
Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
author_sort Pi-Yen Lin
title Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
title_short Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
title_full Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
title_fullStr Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
title_full_unstemmed Transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
title_sort transient liquid crystal measurement of local heat transfer in a low air speed air jet impinging onto a disk in a vertical cylindrical chamber
publishDate 2004
url http://ndltd.ncl.edu.tw/handle/26998804811759666908
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