• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of pin fin height, spacing and orientation to natural convection heat transfer for inline pin fin and plate heat sinks by experimental investigation
【24h】

Effects of pin fin height, spacing and orientation to natural convection heat transfer for inline pin fin and plate heat sinks by experimental investigation

机译：试验研究销钉高度，间距和方向对inline销翅片散热器自然对流传热的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this work, pin fin and plate heat sinks were investigated in terms of natural convection and radiation heat transfer by experimental means. One rectangular base plate and eight pin fin and plate heat sinks were manufactured particularly for this study. Eight different pin fin and plate heat sinks had four different pin fin numbers and hence pin fin spacings; and two different pin fin heights. Three different orientations of 0°, 90° and 180° were tested. Ten different constant heating rates were applied to heat sinks during tests, corresponding to Rayleigh number interval between 1 × 106 and 7 × 106. Heating powers were changed between 5 and 50 W by 5 W increments by means of DC electrical power source. All cases were compared with each other. Results were evaluated by calculating heat transfer indicators from experimental measurements, dependent Nusselt and Rayleigh numbers, and by drawing their corresponding graphics. It was detected that increasing pin fin number up to a threshold value increases thermal performance. After the threshold pin fin number, thermal convection coefficient decreases significantly. Up to the favourable highest pin fin number, the reason of thermal performance enhancement is due to increasing surface area without deteriorating thermal convection coefficient significantly. It is also seen that extended surface area by increasing number of pin fins partly compensates the reduction in thermal convection coefficient up to a level. However, increasing pin fin number further degrades heat transfer performance. Results show that the highest heat transfer is achieved by 121 × 40 pin fin and plate heat sink for all three orientation angles. The lowest heat transfer performance is realized by non-pinned plate. When plate orientation is considered, the highest heat transfer is achieved with upward facing orientation which has 0° orientation angle value, and the lowest heat transfer rate is realized with downward facing heat sink which has 180° orientation angle value. Therefore, it is concluded that inline pin fin and plate heat sinks are best used with upward orientation with optimum number of pins. Experimental dataset was analysed in terms of parametrical effects and accordingly empirical correlations expressions were composed and proposed.
机译：在这项工作中，通过实验手段对自然对流和辐射热传递来研究别针翅片和板散热器。特别为本研究制造了一个矩形底板和八针翅片和板散热器。八个不同的别针翅片和板散热器有四个不同的销鳍数，因此销钉翅片间距;和两个不同的别针翅片高度。测试了0°，90°和180°的三种不同取向。在测试期间将十个不同的恒定加热速率施加到散热器，对应于1×106和7×106之间的瑞利数间隔。通过直流电源将加热功率在5和50W之间变为5W，通过DC电源增加。所有病例均相互比较。通过从实验测量，依赖的NUSERET和RAYLEIGH号码计算传热指示器来评估结果，并通过绘制相应的图形。检测到，向阈值增加销钉数增加了热性能。在阈值引脚翅片数之后，热对流系数显着降低。达到有利的最高销钉数，热能增强的原因是由于表面积的增加而不会显着恶化热对流系数。还可以看出，通过越来越多的销翅片的扩展表面区域部分地补偿了热对流系数的降低到达水平。然而，增加销钉数进一步降低了传热性能。结果表明，对于所有三个取向角度，通过121×40销翅片和板散热器实现最高传热。通过非固定板实现最低传热性能。当考虑板取向时，通过具有0°取向角度值的向上面对方向实现最高传热，并且通过向下的面对散热器实现最低传热速率，其具有180°取向角度值。因此，得出结论，内联销翅片和板散热器最适用于具有最佳销的向上方向。在参数效应方面分析了实验数据集，因此构建和提出了经验相关表达。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号