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Non-intrusive temperature measurement using microscale visualization techniques

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Abstract

μPIV is a widely accepted tool for making accurate measurements in microscale flows. The particles that are used to seed the flow, due to their small size, undergo Brownian motion which adds a random noise component to the measurements. Brownian motion introduces an undesirable error in the velocity measurements, but also contains valuable temperature information. A PIV algorithm which detects both the location and broadening of the correlation peak can measure velocity as well as temperature simultaneously using the same set of images. The approach presented in this work eliminates the use of the calibration constant used in the literature (Hohreiter et al. in Meas Sci Technol 13(7):1072–1078, 2002), making the method system-independent, and reducing the uncertainty involved in the technique. The temperature in a stationary fluid was experimentally measured using this technique and compared to that obtained using the particle tracking thermometry method and a novel method, low image density PIV. The method of cross-correlation PIV was modified to measure the temperature of a moving fluid. A standard epi-fluorescence μPIV system was used for all the measurements. The experiments were conducted using spherical fluorescent polystyrene-latex particles suspended in water. Temperatures ranging from 20 to 80°C were measured. This method allows simultaneous non-intrusive temperature and velocity measurements in integrated cooling systems and lab-on-a-chip devices.

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Acknowledgment

Support for this work from the Indiana 21st Century Research and Technology Fund is gratefully acknowledged.

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Authors and Affiliations

  1. School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907-2088, USA

    Pramod Chamarthy & Steven T. Wereley

  2. Cooling Technologies Research Center, School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907-2088, USA

    Suresh V. Garimella

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  1. Pramod Chamarthy
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  2. Suresh V. Garimella
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  3. Steven T. Wereley
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Correspondence to Steven T. Wereley.

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Chamarthy, P., Garimella, S.V. & Wereley, S.T. Non-intrusive temperature measurement using microscale visualization techniques. Exp Fluids 47, 159–170 (2009). https://doi.org/10.1007/s00348-009-0646-1

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  • DOI: https://doi.org/10.1007/s00348-009-0646-1

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