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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Application of gaseous laser-induced fluorescence in low-temperature convective heat transfer research
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Application of gaseous laser-induced fluorescence in low-temperature convective heat transfer research

机译：气相激光诱导荧光在低温对流传热研究中的应用

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摘要

Laser-induced fluorescence (LIF) thermography has emerged as a technique for measurement of two-dimensional temperature fields with minimal intrusion. This technique has been applied in the past to convective heat transfer problems involving liquids and can provide valuable local heat transfer information in spatially non-uniform convective flows. It has also been used in high-temperature gaseous flows, including combustion chambers and shock tubes. However, LIF has scarcely been used in low-temperature convective heat transfer applications involving gases, where its sensitivity is often limited. Low temperature here refers to the range from room temperature to 100-200 degrees C, where most other gaseous LIF studies are classified high temperature with maxima exceeding 250 degrees C. This study investigates the use of LIF thermography for low-temperature gaseous convective flows, with temperatures near ambient conditions. It demonstrates the utility of LIF thermography for a wider range of low-temperature engineering applications. The fluorescence was excited with a 266 nm laser sheet using a custom-built apparatus. The relationship between toluene fluorescence intensity and temperature was validated in the temperature range 20-60 degrees C, which is substantially lower than in previous studies to date. The same setup was used to measure the temperature field that develops during free and forced convection around a heated cylinder. The thermographic performance of anisole, which has been used in relatively few LIF studies to date, was also investigated.
机译：激光诱导的荧光（LIF）热成像作为测量具有最小侵入性的二维温度场的技术。该技术已经应用于过去涉及液体的对流传热问题，并且可以在空间上不均匀的对流流中提供有价值的局部传热信息。它还用于高温气体流动，包括燃烧室和冲击管。然而，LiF几乎没有用于涉及气体的低温对流传热应用，其灵敏度通常是有限的。这里的低温是指房间温度至100-200摄氏度的范围，其中大多数其他气体LIF研究是含有最高250℃的最大温度的高温。该研究调查了生命热成像对低温气体对流流动的使用，温度靠近环境条件。它展示了Lif Thermoction在更广泛的低温工程应用中的实用性。使用定制装置用266nm激光片激发荧光。甲苯荧光强度和温度之间的关系在20-60℃的温度范围内验证，其基本上低于以前的研究迄今为止。相同的设置用于测量在加热圆筒周围的自由和强制对流期间开发的温度场。还研究了迄今为止迄今为止相对较少的LIF研究中使用的苯甲醚的热成像性能。

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