Abstract
This review article reports the recent progress in the development of a new group of molecule-based flow diagnostic techniques, which include molecular tagging velocimetry (MTV) and molecular tagging thermometry (MTT), for both qualitative flow visualization of thermally induced flow structures and quantitative whole-field measurements of flow velocity and temperature distributions. The MTV and MTT techniques can also be easily combined to result in a so-called molecular tagging velocimetry and thermometry (MTV&T) technique, which is capble of achieving simultaneous measurements of flow velocity and temperature distribution in fluid flows. Instead of using tiny particles, the molecular tagging techniques (MTV, MTT, and MTV&T) use phosphorescent molecules, which can be turned into long-lasting glowing marks upon excitation by photons of appropriate wavelength, as the tracers for the flow velocity and temperature measurements. The unique attraction and implementation of the molecular tagging techniques are demonstrated by three application examples, which include: (1) to quantify the unsteady heat transfer process from a heated cylinder to the surrounding fluid flow in order to examine the thermal effects on the wake instabilities behind the heated cylinder operating in mixed and forced heat convection regimes, (2) to reveal the time evolution of unsteady heat transfer and phase changing process inside micro-sized, icing water droplets in order to elucidate the underlying physics pertinent to aircraft icing phenomena, and (3) to achieve simultaneous droplet size, velocity and temperature measurements of “in-flight” droplets to characterize the dynamic and thermodynamic behaviors of flying droplets in spray flows.
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Acknowledgments
The project is partially supported by the National Aeronautical and Space Administration (NASA) (Grant NNX12AC21A) with Mr. Mark Potapczuk as the technical officer. The support of the National Science Foundation (NSF) under award numbers of CBET-1064196, IIA-1064235 and CBET-1435590 is also gratefully acknowledged.
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Chen, F., Li, H. & Hu, H. Molecular tagging techniques and their applications to the study of complex thermal flow phenomena. Acta Mech. Sin. 31, 425–445 (2015). https://doi.org/10.1007/s10409-015-0464-z
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DOI: https://doi.org/10.1007/s10409-015-0464-z