双向微槽道多孔复合结构沸腾传热研究

Boiling Heat Transfer of Two-way Micro-channel Porous Composite Structure

目的 研究出新型的表面结构,以提高沸腾传热强化。方法 在紫铜板上烧结铜粉多孔层,然后利用线切割对多孔层进行开槽。研究槽道参数包括槽数、槽宽、槽间距和槽向等对沸腾传热效果的影响。结果 开槽增大了传热的表面积,有利于气体逸出,减少气体的逸出阻力,从而多孔表面开槽强化了沸腾传热效果,传热系数与光滑表面相比可提高2~3倍。与单向微槽道相比,双向交叉槽道有着更好的传热效果,能够形成一个稳定的液体补充和气体逸出网络。结论 在多孔表面加工微型复合结构,能够大幅度提高沸腾传热强化。

Objective To develop a new surface structure to enhance boiling heat transfer enhancement. Methods First porous layer of copper on the copper plate was sintered, and then the porous layer was grooved by using wire cutting. The effects of the channel parameters including the number of channel, channel width, channel spacing and channel direction etc. on the boiling heat transfer effect were studied. Results The slotted surface increased the surface area of heat transfer and facilitated gas evolution, reduced the resistance of gas escaping. Thereby the slotted porous surface strengthened the effect of boiling heat transfer. The heat transfer coefficient could be increased by 2-3 times compared with smooth surface. Compared with the one-way micro-channel, two-way cross-channel had a better heat transfer effect, capable of forming a stable liquid supplement and gas evolution network. Conclusion Micro machining composite structure on the porous surface could significantly improve the boiling heat transfer enhancement.