栅格式方孔翅片自然对流换热的数值模拟

Numerical Study of Natural Convection in Plate Heat Sinks with Grid Square Holes

为改善电子器件的散热情况,提出了一种新型结构的栅格式方孔翅片,并对其在自然对流条件下的散热特性进行了研究。利用正交试验法和Fluent数值模拟,模拟了102种不同翅片高度与间距比H/S、不同孔边长与翅片厚度比b/δ的散热情况。研究得到:大空间自散热条件下,H/S=2、b/δ=0～4时的Gr-Nu的关系图;有限空间散热条件下,b/δ=1.5、H/S=1～16/3时的Gr-Nu的关系图。结果表明,格栅式方孔翅片可以改善电子器件的散热,并为LED照明等电子器件散热设计提供新的思路和理论依据。

To improve the heat transfer in electronic devices,a new fin type heat exchanger with grid square holes was proposed,and its heat transfer characteristics in natural convection condition was analyzed.Using orthogonal experiment method and the Fluent modeling software,102 different structure kinds of fin type heat exchanger with different ratios of fin heights to intervals between them,and different ratios of square-hole side length to fin thickness were simulated respectively.Results included：Gr-Nu relation graphs when H/S=2 and b/δ=0~4 under large space natural convection conditions;Gr-Nu relation graphs when b/δ=1.5 and H/S =1~10/3 under limited space natural convection conditions.Research results suggest that the new proposed fin type heat exchanger with grid square holes has the potential to achieve a better heat transfer performance under natural convection conditions.This paper can provide new thoughts and theoretical guidance for the heat design of electron devices,such as LED lamps.