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Dual-tracer fluorescence thermometry measurements in a heated channel

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Abstract

The exponential growth of component density in microelectronics has renewed interest in compact and high heat flux thermal management technologies that can handle local heat fluxes exceeding 1 kW/cm2. Accurate and spatially resolved thermometry techniques that can measure liquid-phase temperatures without disturbing the coolant flow are important in developing new heat exchangers employing forced-liquid and evaporative cooling. This paper describes water temperature measurements using dual-tracer fluorescence thermometry (DFT) with fluorescein and sulforhodamine B in laminar Poiseuille flow through polydimethyl siloxane-glass channels heated on one side. The major advantage of using the ratio of the signals from these two fluorophores is their temperature sensitivity of 4.0–12% per °C—a significant improvement over previous DFT studies at these spatial resolutions. For an in-plane spatial resolution of 30 μm, the average experimental uncertainties in the temperature data are estimated to be 0.3°C.

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Acknowledgments

This work was supported by the National Science Foundation and Sandia National Laboratories through NSF grant CBET-0625825 from the Thermal Transport Processes Program (Dr. T. L. Bergman, program officer) and the Office of Naval Research through grant N00014-09-1-0298 from the Thermal Management Program (Dr. M. Spector, program manager). The authors thank K. D. Suda-Cederquist and Dr. T. G. Hwang for their help on the Fl and SrB absorption studies.

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  1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA

    Myeongsub Kim & Minami Yoda

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  1. Myeongsub Kim
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  2. Minami Yoda
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Correspondence to Minami Yoda.

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Kim, M., Yoda, M. Dual-tracer fluorescence thermometry measurements in a heated channel. Exp Fluids 49, 257–266 (2010). https://doi.org/10.1007/s00348-010-0853-9

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  • DOI: https://doi.org/10.1007/s00348-010-0853-9

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