ON FROST FORMATION AND HEAT TRANSFER IN TURBULENT MOIST AIR FLOW USING DIRECT NUMERICAL SIMULATIONS

Mahsa Farzaneh; Nadim  Zgheib; S.  Balachandar; S. A. Sherif

doi:10.1615/TFEC2023.fna.046463

ISSN Online: 2379-1748

8th Thermal and Fluids Engineering Conference (TFEC)

March, 26-29, 2023, College Park, MD, USA

ON FROST FORMATION AND HEAT TRANSFER IN TURBULENT MOIST AIR FLOW USING DIRECT NUMERICAL SIMULATIONS

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DOI: 10.1615/TFEC2023.fna.046463

Mahsa Farzaneh
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA

Nadim Zgheib
Dept. of Mechanical & Aerospace Engineering, University of Florida, Gainesville, FL 32611 USA; School of Engineering, Lebanese American University, Byblos 1401 Lebanon

S. Balachandar
Dept. of Mechanical & Aerospace Engineering, University of Florida, Gainesville, FL 32611 USA

S. A. Sherif
University of Florida

Abstract

In this paper, we use a recently-developed physics-based model to study frost formation over a flat plate subjected to turbulent moist air flow. We find that the Nusselt and Sherwood numbers, when scaled by the frost surface to free stream temperature and humidity ratio difference, respectively, become independent of free-stream temperature and humidity ratio as well as plate temperature. For an initial shear Reynolds number of Re = 180, we find the heat and mass transfer rates to be enhanced by a factor of three compared to laminar flow conditions.

KEY WORDS: near-field radiative heat transfer, micro/nanoparticles, fluctuational electrodynamics, dipole approximations, geometry-dependent resonances