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首页> 外文期刊>International journal of heat exchangers >Numerical Analysis of Self-sustained Flow Oscillations in Flat and Wavy Interrupted Fin Heat Exchangers
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Numerical Analysis of Self-sustained Flow Oscillations in Flat and Wavy Interrupted Fin Heat Exchangers

机译：Numerical Analysis of Self-sustained Flow Oscillations in Flat and Wavy Interrupted Fin Heat Exchangers

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摘要

The decrease of the air-side thermal resistance by adoption of variously interrupted and corrugated surfaces is a major aim in compact heat exchangers design. The current study presents a two-dimensional numerical analysis of flow field and heat transfer in two typical fin configurations: flat and wavy interrupted fins. Simulations are carried out for a wide range of Reynolds number [100-1000] inside laminar regime and, as Reynolds increases, steady, time periodic and nearly chaotic flow solutions have been detected. The flow structures have been analysed in detail and the main mechanisms of heat transfer enhancement, i.e. the interruption of laminar boundary layer on fins and the onset of self-sustained flow oscillations over a Reynolds critical value, have been discussed. Heat transfer and frictional pressure losses have been evaluated for both configurations and the impact of unsteadiness onset on global performances of the heat exchanger has been underlined. A finite element procedure which utilizes equal order pressure-velocity interpolation functions has been employed in the numerical simulations. Periodic and anti-periodic boundary conditions along the streamwise and transverse directions have been imposed in order to reduce the computational domain.

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