微槽群结构对微纳复合表面汽泡周期的影响

Effects of Microgrooves Structure on Bubble Period on Surfaces with Micro-Nano Composite Structure

将涂有250nm钛纳米涂层,且具有不同微尺度结构的微槽群竖直放置,采用高速摄影技术对热沉中的汽泡周期进行可视化研究.研究结果表明:当热流密度较小时,汽泡周期随着微槽深宽比的增加而减小;随热流密度的增大,汽泡周期逐渐减小;微尺度效应对汽泡周期的影响随着热流密度的增加而减弱.

The visualization study of the period of bubble behavior in the microgroove heat sinks was implemented by high speed photography technique. The microgroove plates were vertically placed and coated with 250 nm titanium nano coating to generate micro-nano composite structure surface. The results showed that when the heat flux density was small, the bubble period decreased with the increase of micro groove depth-width ratio;with the increase of heat flux density,bubble period decreased, and the microscale effect on bubble period was weaken as well.