高热流密度条件下单向多孔介质强化传热研究

K. Yuki
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引用次数: 1

摘要

在本章中,介绍了新型的单向多孔金属传热强化技术“蒸发”和“莲花呼吸”,用于从高热流密度设备中去除和管理热量。本文介绍的单向多孔金属可以通过模具铸造技术、爆炸焊接技术和3D打印技术等独特技术轻松制造。首先,对笔者目前所介绍的作为传热促进剂的多种多孔介质进行比较,重点从渗透率和有效导热系数两方面来阐明哪种多孔金属更适合于高热流通量的去除和冷却。针对具有高渗透性和高导热性的单向多孔铜的实际应用,首先对“蒸发”两相流冷却的换热性能进行了综述,目标是去除10 MW/m2以上的极高热流密度。我们提出了这个装置,用3D打印技术制造的单向多孔铜作为核聚变分流器的散热器和连铸模具。其次,针对电力电子和高性能计算机等各种电子产品的热管理,引进了利用“呼吸现象”的两相浸入式冷却技术“莲花呼吸”。热流密度水平为0.1 MW/m2 ~ 5 MW/m2。此外,作为另一种单向多孔金属强化换热技术,本文还介绍了利用爆炸焊接技术制作的单向多孔铜管,用于单相流强化换热。
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Heat Transfer Enhancement Using Unidirectional Porous Media under High Heat Flux Conditions
In this chapter, new heat transfer enhancement technologies with unidirectional porous metal called “EVAPORON” and “Lotus’ Breathing” are introduced to remove and manage heat from high heat flux equipment. The unidirectional porous metals introduced here can be easily fabricated by unique techniques such as mold casting technique, explosive welding technique, and 3D printing technique. First of all, many kinds of porous media, which have been introduced by the author so far as a heat transfer promoter, are compared each other to clarify what kind of porous metal is more suitable for high heat flux removal and cooling by focusing on the permeability and the effective thermal conductivity. For the practical use of the unidirectional porous copper with high permeability and high thermal conductivity, at first, heat transfer performance of two-phase flow cooling using a heat removal device called “EVAPORON” is reviewed aiming at extremely high heat flux removal beyond 10 MW/m2. We have been proposing this device with the unidirectional porous copper fabricated by 3D printing technique as the heat sink of a nuclear fusion divertor and a continuous casting mold. Second, two-phase immersion cooling technique called “Lotus’ Breathing” utilizing “Breathing Phenomenon” is introduced targeting at thermal management of various electronics such as power electronics and high performance computers. The level of the heat flux is 0.1 MW/m2 to 5 MW/m2. In addition, as the other heat transfer enhancing technology with unidirectional porous metals, unidirectional porous copper pipes fabricated by explosive welding technique are also introduced for heat transfer enhancement of single-phase flow.
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21
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