Two-dye laser-induced fluorescence (LIF) thermometry for ice-water systems

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2025-06-04 DOI:10.1007/s00348-025-04053-6

Muhammad Ahmad Mustafa, Chris C. K. Lai, Alex Zimmer

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引用次数: 0

Abstract

We present an extension to the two-dye two-color laser-induced fluorescence (LIF) thermometry technique so that it can be applied to ice-water systems for direct heat flux measurements near the ice-water interface. Our chosen dye pair consists of the temperature-sensitive dye rhodamine B (RhB) and the temperature-insensitive dye sulforhodamine 640 (SR640), mixed at the concentration ratio of \(C_\textrm{RhB}/C_\textrm{SR640} = 0.5\) which we found to be optimal in terms of signal strengths and temperature sensitivity when they are excited at 527 nm. Our extension relies on the creation of uniformly dyed ice and this can be achieved by adding 5 g/L of sugar into dyed solutions prior freezing. The dyes remain potent after one freezing and melting cycle and the added sugar brings negligible change to the freezing point of water. The developed technique has been applied to measure the temperature change due to the melting of a horizontal ice block immersed into an initially stagnant body of water in a box. The calculated Nusselt numbers are in good agreement with the established empirical correlation for free horizontal convection. Moreover, an important finding is that in situ calibration of the LIF technique is not needed as long as the concentration ratio, solvent, image magnification, and dye thickness remain the same among experimental setups.

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冰水系统的双染料激光诱导荧光（LIF）测温

我们提出了双染料双色激光诱导荧光（LIF）测温技术的扩展，使其可以应用于冰水系统，在冰水界面附近进行直接热通量测量。我们选择的染料对由对温度敏感的染料罗丹明B （RhB）和对温度不敏感的染料硫丹明640 （SR640）组成，以\(C_\textrm{RhB}/C_\textrm{SR640} = 0.5\)的浓度比混合，我们发现当它们在527 nm激发时，在信号强度和温度灵敏度方面是最佳的。我们的扩展依赖于均匀染色冰的产生，这可以通过在冷冻前向染色溶液中添加5 g/L的糖来实现。染料在一个冷冻和融化循环后仍然有效，添加的糖对水的冰点的变化可以忽略不计。所开发的技术已被应用于测量由于水平冰块浸入最初停滞的水体在一个盒子里融化的温度变化。计算得到的努塞尔数与已建立的自由水平对流的经验相关性很好地吻合。此外，一个重要的发现是，只要在实验装置中浓度比、溶剂、图像放大倍率和染料厚度保持不变，就不需要对LIF技术进行原位校准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.