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Using patterned surface wettability to enhance air-side heat transfer through frozen water droplet vortex generators – Part II: CFD simulation results.

Author(s) : KOOPMAN A. E., SOMMERS A. D., HERMES C. J. L.

Type of article: IJR article

Summary

In this study, a novel technique for deploying hemispherical vortex generators (VGs) aimed at heat transfer enhancement via the naturally-occurring processes of condensation and freezing was proposed and investigated. By using patterned surface wettability to collect condensate and encourage coalescence in predetermined locations, it was hypothesized that large frozen droplets could be formed in various configurations which could serve as VGs. This approach was simulated numerically in the present communication (Part II) and examined experimentally in a previous study (Part I). For the CFD simulations, ten different configurations in channel flow emulating a fin density of 5 FPI were investigated. Inlet air velocities of 1.0 and 2.0 m s−1 at 20°C were examined for the flow through the channel where the walls and VGs were set to -9°C to match the experimental conditions used in Part I. The air-side heat transfer coefficient, pressure drop, and temperature changes were then calculated after a converged solution was reached. Compared to a baseline configuration without VGs, heat transfer enhancements ranging from 14.0 to 75.9% were observed, with corresponding pressure drop increases (or penalties) ranging from 35.7 to 165.6%.

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Details

  • Original title: Using patterned surface wettability to enhance air-side heat transfer through frozen water droplet vortex generators – Part II: CFD simulation results.
  • Record ID : 30029179
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
  • Publication date: 2021/11
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.07.034
  • Document available for consultation in the library of the IIR headquarters only.

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