STTR Phase I: Innovative Two-Phase Cooling with Micro Closed Loop Pulsating Heat Pipes for High Power Density Electronics

该小型企业技术转让（STTR）第一阶段项目的更广泛影响/商业潜力是为移动的设备开发改进的散热解决方案。 如今的冷却解决方案通常无法满足5G/6 G电信的需求，其热加热率高达4G技术的10倍。即使是当前的高性能5G移动的手机也具有大大增加的热负载，这反过来又增加了智能手机的外部触摸温度，并且经常触发手机减慢其速度。所提出的技术可以导致改进的冷却，以提高性能，而不限制性能节流。 增强尖端移动的设备的散热能力可能有助于5G/6 G电信、虚拟和增强现实、人工智能、自动驾驶汽车和大数据应用的广泛采用。这个小企业技术转让（STTR）第一阶段项目开发了一种基于脉动热管的新型被动微两相冷却，其由平板中的微通道环组成，其中蛇形管中的冷却剂的振荡由蒸汽气泡产生，以泵送液体和蒸汽来输送较高的热负荷。 该设计利用复杂的自诱导脉动，通过增强脉动热管的流体运动与局部障碍物来创建分布式气泡成核点，从而更好地执行传递更大量热量的工作。相同的障碍物将用于改善微热传热过程。该项目将微流体技术引入脉动热管。 该项目的研究目标是在相同的薄外形尺寸下，与竞争性冷却技术（蒸汽室）相比，在热性能方面有实质性的改进。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The broader impact/commercial potential of this Small Business Technology Transfer (STTR) Phase I project is the development of improved thermal cooling solutions for mobile devices. Cooling solutions today are often unable to meet the demands of 5G/6G telecommunications with thermal heating rates up to 10 times that of 4G technologies. Even current high performance 5G mobile phones have greatly increasing thermal loads, which, in turn, increase the external touch temperature of the smart phone and often trigger the phone to slow down its speed. The proposed technology may result in improved cooling for increased performance without limitations of performance throttling. Enhancing thermal cooling capabilities of cutting edge mobile devices may help enable widespread adoption of 5G/6G telecommunications, virtual and augmented reality, artificial intelligence, self-driving cars, and big data applications.This Small Business Technology Transfer (STTR) Phase I project develops a new passive micro-two-phase cooling based on pulsating heat pipes, which consist of a loop of microchannels in a flat plate in which oscillations of the coolant in the serpentine are generated by vapor bubbles to pump liquid and vapor to transport higher heat loads. The design harnesses complex self-induced pulsations to better perform the work of transferring larger quantities of heat by enhancing the pulsating heat pipe's fluid motion with localized obstructions to create distributed bubble nucleation points. The same obstructions will be used to improve the micro-thermal heat transfer processes. The project introduces microfluidics to pulsating heat pipes. The research objectives of the proposed project are to demonstrate substantial improvements in thermal performance compared to competing cooling technology (vapor chambers) at the same thin form factors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.