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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Accurate LBM appraising of pin-fins heat dissipation performance and entropy generation in enclosures as application to power electronic cooling
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Accurate LBM appraising of pin-fins heat dissipation performance and entropy generation in enclosures as application to power electronic cooling

机译：精确的L​​BM对电源电子冷却的滤芯散热性能和熵生成的评估

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Purpose - The purpose of this paper is to carry out an in-depth analysis of heat dissipation performance by natural convection phenomenon inside light-emitting diode (LED) lamps containing hot pin-fins because of its significant industrial applications. Design/methodology/approach - The problem is assimilated to heat transfer inside air-filled rectangular cavity with various governing parameters appraised in ranges interesting engineering application and scientific research. The lattice Boltzmann method is used to predict the dynamic and thermal behaviors. Effects of monitoring parameters such as Rayleigh number Ra (10~3-10~6), fin length (0-0.25) and its position, pin-fins number (1-8), the tilting-angle (0-180°) and cavity aspect ratio Ar (0.25-4) are carried out Findings - The rising behaviors of the dynamic and thermal structures and heat transfer rate (Nu), the heatlines distribution and the irreversibility rate are appraised. It was found that the flow is constantly two contra-rotating symmetric cells. The heat transfer is almost doubled by increasing Ra. A lack of cooling performance was identified between Ar = 0.5 and 0.75. The inclination 45° is the most appropriate cooling case. At constant Ra, the maximum stream-function and the global entropy generation remain almost unchanged by increasing the pin number from 1 to 8 and the entropy generation is of thermal origin for low Ra, so that the fluid friction irreversibility becomes dominant for Ra larger than 105. Research limitations/implications - Improvements may include three-dimensional complex geometries, accounting for thermal radiation, high unit power and turbulence modelling. Such factors effects will be conducted in the future. Practical implications - The cooling performance/heat dissipation in LED lamps is a key manufacturing factors, which determines the lifetime of the electronic components. The best design and installation give the opportunity to increase further the product shelf-life.Originality/value - Both cooling performance, irreversibility rate and enclosure configuration (aspect ratio and inclination) are taken into account. This cooling scheme will give a superior operating mode of the hot components in an era where energy harvesting, storage and consumption is met with considerable attention in the worldwide.
机译：目的 - 本文的目的是通过其具有热销翅片的发光二极管（LED）灯内的自然对流现象进行了深入分析，该灯具由于其重要的工业应用而受到热针翅片。设计/方法/方法 - 该问题被同化在空气填充矩形腔内传热，各种控制参数评估在距离有趣的工程应用和科学研究中。格子Boltzmann方法用于预测动态和热行为。监测参数如Rayleigh Number Ra（10〜3-10〜6），翅片长度（0-0.25）及其位置，倾斜角（0-180°）进行了腔体纵横比AR（0.25-4）进行了发现 - 动态和热结构的上升行为和传热速率（nu），热线分布和不可逆率。发现流动是常长两个对比对称电池。通过增加Ra，传热几乎加倍。在Ar = 0.5和0.75之间鉴定了缺乏冷却性能。倾斜度45°是最合适的冷却盒。在恒定RA处，最大流函数和全局熵生成通过增加1至8的引脚数而仍然不变，并且熵产生对于低RA的热来源，使得流体摩擦不可逆转性比ra大于105.研究限制/含义 - 改进可能包括三维复杂几何形状，占热辐射，高单元功率和湍流建模。这些因素将在未来进行。实际意义 - LED灯中的冷却性能/散热是一个关键的制造因子，它决定了电子元件的寿命。最好的设计和安装赋予了更多的机会，进一步提高了产品货架 - 寿命。考虑了冷却性能，不可逆率和外壳配置（纵横比和倾斜）。这种冷却方案将在全球范围内举行能量收集，储存和消耗的时代，在全球范围内得到相当大的关注，该冷却方案将提供热部件的优越操作模式。

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