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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019026068
pages 1205-1229

NUMERICAL STUDY OF AIR-ATOMIZED WATER MIST COOLING OF A HEATED FLAT PLATE

Vikash Kumar Singh Chauhan
Department of Mechanical Engineering, National Institute of Technology, Manipur, Imphal, Manipur 795004, India
Dushyant Singh
Department of Mechanical Engineering, National Institute of Technology, Manipur, Imphal, Manipur 795004, India
Dr. Singh works in a general area of fluid flow and heat transfer with a focus on understanding the flow physics and heat transfer characteristics of the complex problem in advanced industry problem, along with experimentally and numerically of interest.

ABSTRAKT

The present numerical study describes the phenomena of impingement cooling of a heated fl at surface by air and water mist-jet for mass loading fraction ƒ = 0.003−0.024 at Redhyd = 4500 and h/d = 5. A multiphase two-dimensional axisymmetric, incompressible and turbulent flow is considered in the present study. The results obtained using the standard k−ε, standard k−ω, RNG k−ε, realizable k−ε, and SST k−ω turbulence models were analyzed and discussed. The predictions of the local heat transfer coefficient show that the realizable k−ε turbulence model predicts heat transfer results better than other turbulence models. The comparative study was performed to select a suitable multiphase model among the volume of fluid, mixture, and Eulerian models. The Eulerian multiphase model predicts heat transfer from mist-jet impingement on a flat surface much better than the volume of fluid and mixture multiphase models. Normalized axial and radial velocities of the continuous and dispersed phase are presented to understand the fluid flow. The present numerical study also discusses turbulent kinetic energy near the nozzle exit and volume fraction over the heated flat surface.

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