Local entropy production rates are determined from a numerical and experimental study of natural convection in an enclosure. Numerical predictions are obtained from a control-volume-based finite element formulation of the conservation equations and the Second Law. The experimental procedure combines methods of particle image velocimetry and planar laser induced fluorescence for measured velocity and temperature fields in the enclosure. An entropy based conversion algorithm in the measurement procedure is developed and compared with numerical predictions of free convection in the cavity. The predicted and measured results show close agreement. A measurement uncertainty analysis suggests that the algorithm postprocesses velocities (accurate within to give entropy production data, which is accurate within near the wall. Results are reported for free convection of air and water in a square cavity at various Rayleigh numbers. The results provide measured data for tracking spatial variations of friction irreversibility and local exergy losses.
Particle Image Velocimetry Based Measurement of Entropy Production With Free Convection Heat Transfer
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 1, 2004; revision received November 23, 2004. Review conducted by: J. M. Khodadadi.
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Adeyinka, O. B., and Naterer, G. F. (June 6, 2005). "Particle Image Velocimetry Based Measurement of Entropy Production With Free Convection Heat Transfer ." ASME. J. Heat Transfer. June 2005; 127(6): 614–623. https://doi.org/10.1115/1.1863272
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