Computational modeling is performed for liquid sprays and thermal mixing in desuperheating applications, in which water sprays are injected into a high-temperature steam crossflow (H2Ol-H2Og system) to reduce the enthalpy. The basis of the model is the standard RANS approach coupled to the Lagrangian treatment for statistical groups (parcels) representing the physical droplet population. A vaporization/boiling model is developed for the treatment of phase change under a single chemical species environment. Additionally, the best performing hybrid breakup models depicting the hydrodynamic breakup process governed by the Kelvin-Helmholtz and Rayleigh-Taylor instabilities, are used. The calculations are run for both air-H2Ol and H2Ol-H2Og systems. Under crossflow conditions, the calculations show that liquid sprays undergo sudden atomization near the injector tip, and have a much smaller characteristic droplet size compared to sprays injected into quiescent environments. This is attributed to the larger gas-droplet relative velocities drastically enhancing the Weber number. Additionally, a blockage effect of the spray on the crossflow is observed in the near-nozzle field, and the typical entrainment of small droplets into the wake is captured in the predictions. The region of maximum cooling coincides with the generation of the highest values of interfacial area produced by the sudden atomization in the near field.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4941-5
PROCEEDINGS PAPER
Modeling of Liquid Sprays and Thermal Mixing in Desuperheating Applications Available to Purchase
Jian Gao,
Jian Gao
University of Wisconsin-Madison, Madison, WI
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Mario F. Trujillo
Mario F. Trujillo
University of Wisconsin-Madison, Madison, WI
Search for other works by this author on:
Jian Gao
University of Wisconsin-Madison, Madison, WI
Mario F. Trujillo
University of Wisconsin-Madison, Madison, WI
Paper No:
IHTC14-22877, pp. 787-796; 10 pages
Published Online:
March 1, 2011
Citation
Gao, J, & Trujillo, MF. "Modeling of Liquid Sprays and Thermal Mixing in Desuperheating Applications." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 6. Washington, DC, USA. August 8–13, 2010. pp. 787-796. ASME. https://doi.org/10.1115/IHTC14-22877
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