As the distance between the domes increases, the angle between the air velocity vector and the temperature gradient between the fins decreases, and the synergy between the velocity field and the temperature field is improved, thereby greatly improving the overall heat dissipation performance of the heat exchanger. This is another important reason why the maximum temperature of the substrate as shown in Figure 7 varies with the distance between the domes. LED mounting height changes. Taking the plate-fin heat exchanger as the research object, the numerical analysis of the heat transfer performance of the heat exchanger under natural convection in the open space and the tunnel environment is carried out by numerical simulation. The high-effect effect of the tunnel LED heat dissipation is studied, and the field synergy principle is used. Reveal the essence of this phenomenon.
Finally, the following important conclusions were obtained. (1) Compared with the open space environment, the external flow field of LED lamps in the tunnel environment is significantly different, the former belongs to the circulation flow type, and the latter belongs to the ceiling jet flow pattern. However, in two different environments, the flow field between the fins shows similarity, the air movement intensity is equivalent, and the air flow state is a single chimney type. (2) The installation height has an important influence on the overall heat transfer performance of the tunnel LED lamps. When the dome distance is less than double the height H of the heat exchanger, the heat transfer performance of the LED lamp is obviously improved with the increase of the dome distance. With the increase of the chip power, the effect is more obvious. When the dome distance is greater than H, the height effect of the tunnel LED heat dissipation is weakened. (3) The reason for the high effect of tunnel LED heat dissipation is that on the one hand, when the fin enters the high temperature zone near the dome, the temperature difference between the fin and the air is reduced, and the convective heat transfer between the two is weakened; As the distance between the domes decreases, the angle between the air velocity vector and the temperature gradient between the fins increases, the degree of synergy between the flow field and the temperature field becomes worse, and the overall heat dissipation performance of the heat exchanger decreases.
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