TED-AJ03-272 IMPINGEMENT HEAT TRANSFER OF FREE-SURFACE LIQUID JETS WITH PHASE CHANGE AT THE SUBSTRATE
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概要
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Heat transfer problems accompanied by solid-liquid phase change are of great interest in a wide range of natural processes and industrial applications. The focus of the present research is on the phase change occurring at a substrate on which a free-surface liquid jet is impinging. Specifically, a numerical study is performed on the following two problems : (1) the solidification of a free surface liquid jet at a substrate maintained at a temperature below the jet melting point and (2) the melting of a substrate by a liquid jet with an inlet temperature higher than the melting point of the substrate. The objective is to examine the convective heat transfer and the phase change evolvement of the impingement process. Both plane and circular jets are considered. A schematic showing symmetric half of a liquid jet impinging normally ont surface is shown in Figure A-1. Due to the complex nature of the jet impingem process, very few theoretical studies have been reported the literature, and to the best knowledge of this auth none of those considers solid-liquid phase change. The complexities include the presence of a free surface, inclusion of the latent heat and the tracking of a movi phase-change boundary. In the present numerical study, the Navier-Stok equations are solved using a finite-volume formulati with a two-step projection method on a fixed non-unifo rectangular grid. The free surface of the jet is tracked the volume-of-fluid (VOF) method with a second or accurate piecewise-linear scheme. The energy equation is modeled by using an enthalpy-based formulation. The method provides a comprehensive model for the dynamic and thermal aspects of the impinging process. In the solidification case, the liquid flow field, the solid and liquid temperature distributions, the solid-liquid interface location and the jet free surface are obtained. The effects of several key parameters are examined. These include : jet impact velocity, liquid jet temperature, and latent heat. It has been found that the solid layer thickness decreases with increasing jet impacting velocity, jet inlet temperature, and latent heat. Some preliminary results on the melting of a substrate by an impinging jet have also been obtained. A more complete report will be forthcoming.[figure]
- 一般社団法人日本機械学会の論文
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- TED-AJ03-272 IMPINGEMENT HEAT TRANSFER OF FREE-SURFACE LIQUID JETS WITH PHASE CHANGE AT THE SUBSTRATE