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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >CHEMICALLY ETCHED CRYOGENIC MICRO STRUCTURE HEAT EXCHANGER
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CHEMICALLY ETCHED CRYOGENIC MICRO STRUCTURE HEAT EXCHANGER

机译：化学蚀刻的低温微结构换热器

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摘要

A tandem 4 K pulse tube refrigerator requires a recuperator to be fully accomplished. The recuperator should be a counter-flow heat exchanger which has micro heat-transfer structure like a regenerator of cryogenic refrigerators. However, the technology of such a heat exchanger is not well established yet. Hence, the development of a counter-flow compact heat exchanger with micro structure is demanded first in order to proceed to the recuperative 4 K pulse tube refrigerator. This paper describes the design, fabrication and preliminary performance test of such a heat exchanger. The stainless steel micro structure with approximately 0.1 mm characteristic length has been created by chemical etching. The parallel V-shape double-sided micro channels (chevron stucture) in the heat exchanger enable the flow to be three-dimensionally well mixed so that the heat transfer at low Reynolds number can be enhanced. The etched plates are stacked and bonded through a vacuum brazing process to compose a plate-type heat exchanger. The chemically etched micro-structure heat exchanger has thermal effectiveness of 97%.
机译：串联4 K脉冲管制冷机需要完全实现同流换热器。换热器应该是具有微型传热结构的逆流热交换器，例如低温冰箱的蓄热器。然而，这种热交换器的技术尚未很好地建立。因此，首先需要开发具有微结构的逆流紧凑型热交换器，以便进行换热式4 K脉冲管制冷机。本文介绍了这种热交换器的设计，制造和初步性能测试。通过化学蚀刻形成了特征长度约为0.1 mm的不锈钢微结构。热交换器中平行的V形双面微型通道（人字形结构）使流动在三维上得到充分混合，从而可以增强低雷诺数下的传热。蚀刻后的板通过真空钎焊工艺堆叠并结合在一起，构成板式热交换器。化学蚀刻的微结构热交换器的热效率为97％。

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