TED-AJ03-125 CONJUGATE HEAT TRANSFER COMPUTATIONS OF FLOWS WITH DROPLET IMPINGEMENT

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概要

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• Cool droplets impinging on hot surfaces provide a significant cooling effect, mainly due to their evaporative latent heat effect. Spray cooling has been widely used in industry to improve heat transfer rates in mist-cooled heat exchangers. The phenomenon manifests itself in an inverse situation in aerospace, namely in thermal anti-icing devices that keep the wing at a high enough temperature to prevent ice formation by the external stream of cold air and water droplets. In these examples, the heat transfer enhancement is due to the sensible heat contribution of the impinging droplets and their evaporative latent heat. Thus, a prediction of the droplets' flow, an estimate of the film's development along the solid wall, and an evaluation of the balance of convective heat flux from the flow, conductive heat flux from the solid wall and latent heat contribution, are all required for a correct prediction of the global heat transfer performance. Although empirical correlations and analogies have traditionally been used to describe these phenomena, computational fluid dynamics ought to provide more flexible and cost-effective generic analysis/design tools for such applications. In the present paper, FENSAP-ICE, an integrated Navier-Stokes icing system is described and validated against experimental data. FENSAP-ICE is based on a unified partial differential equations-based methodology to all facets of the problem, including droplet impingement, wall film development and conjugate heat transfer computations. This allow the handling of complex fully 3D problems frequently encountered in anti-icing situations, using the latest CFD technology. The system is first validated through the evaluation of heat transfer enhancement in the presence of mist cooling in an array of cylindrical tubes, and an application to the analysis of a nacelle during full anti-icing operations (i.e. when the heat supply is high enough to prevent any ice formation) is presented. In all of the applications considered in the present research the temperature level is well below Leidenfrost transition.[figure]

• 一般社団法人日本機械学会の論文

著者

• Croce Giulio

  Diem Universita Di Udine

• CROCE Giulio

  DIEM, Universita di Udine

• HABASHI Wagdi

  Computational Fluid Dynamics Laboratory McGill University

• BEAUGENDRE Heloise

  Computational Fluid Dynamics Laboratory McGill University

関連論文

• TED-AJ03-125 CONJUGATE HEAT TRANSFER COMPUTATIONS OF FLOWS WITH DROPLET IMPINGEMENT

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