<p>The measurement of particle plume and curtain temperatures in particle-laden and gravity-driven flows present a unique challenge to thermometry due to the flow’s transient and stochastic nature. Multiple attempts found in literature have attempted to find a solution to the problem of measuring the bulk particle temperature of a plume using intrusive and non-intrusive methods without success. This work focuses on the development of a novel non-intrusive method using a high-speed IR camera (ImageI8300 from Infratec) and a visible-light camera (Nikon D3500) to achieve this indirect particle temperature measurement. The thermogram sets collected allow for the measurement of the apparent particle temperature as a function of flow discharge position, while the visible-light image sets collected allow for the calculation of the plume opacity of as a function of flow discharge position. An in-house post-processing algorithm based on Planck’s radiation theory was developed to compute the true particle temperature which is a function of the apparent temperature and the plume opacity obtained from the thermograms and visible-light images, respectively. To validate the results obtained from the methodology, a series of lab-scale tests generating particle curtains of known dimensions at various temperatures were performed. The lab-scale tests were conducted using a small particle receiver which is equipped with thermocouples to record the temperature data during tests. Using the thermocouple data recorded, a particle temperature function can be empirically derived using the lumped capacitance model for a free-falling sphere. The empirical particle temperature function is then compared with the temperature data measured using the methodology outlined in this work yielding agreement of the bulk particle temperature of the plume. The methodology developed will be used as a basis for the development of a methodology to estimate the heat losses from the falling particle receiver at Sandia National Labs.</p><p>“Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.”</p>

A Non-Intrusive Particle Temperature Measurement Methodology Using Thermogram and Visible-Light Image Sets

Paper Proceedings: https://asmedigitalcollection.asme.org/ES/ES2021/volume/84881

ASME 2021 Energy Sustainability (ES2021)

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