低温冷链中使用的多孔材料对液氮的吸收

IF 1.8 3区 工程技术 Q3 PHYSICS, APPLIED
R.M.A. Spijkers, S. Vanapalli
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引用次数: 0

摘要

干式运输船是一种用于在低温下运输冷冻生物医学样本的干燥箱。干燥箱内部衬有多孔材料,可吸收并防止液氮在运输过程中溢出。这些多孔材料在填充干式运输船时可能会截留蒸汽,从而缩短运输和储存时间。目前还不太清楚蒸汽形成的条件以及与多孔材料特性之间的关系。我们通过比较孔隙相对较大(1-100 μm)的硅酸铝材料和孔隙较小(∼0.45 μm)的硅酸钙材料对液氮的吸收情况,研究了孔隙大小分布对多孔材料中蒸汽截留的影响。将这两种样品浸入饱和液氮中,比较吸收液体的体积分数和孔隙率,结果显示硅酸钙样品中完全充满了液体,而硅酸铝样品中含有大约百分之二十的蒸气。作为进一步的研究,我们对过冷液氮中的吸收特性进行了研究。在这种情况下,两种材料都吸收了相当于各自空隙率的液体,表明材料中没有气穴。根据这些结果,我们为干式运输船中可能使用的新型多孔材料提出了一个设计特性窗口。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Absorption of liquid nitrogen into porous materials used in the cryogenic cold chain

A dry-shipper is a dewar used to transport frozen biomedical samples at cryogenic temperature. The inside of the dewar is lined with a porous material that absorbs and prevents the spillage of liquid nitrogen during transportation. In these porous materials vapor might be trapped during filling of the dry-shipper leading to a lower transport and storage time. The conditions under which the vapor is formed and the relationship with the porous material properties is not well understood. We studied the impact of the pore size distribution on the vapor retention in the porous materials by comparing liquid nitrogen absorption in aluminosilicate material with relatively large pores (1-100 μm) and calciumsilicate with small pores (∼0.45 μm). Both samples were immersed into saturated liquid nitrogen and a comparison of the absorbed liquid volume fraction with the porosity showed the calciumsilicate sample was completely filled with liquid, whereas the aluminosilicate contained a vapor fraction of about twenty percent. As a further investigation, we studied the absorption characteristics in subcooled liquid nitrogen. In this case, both materials absorbed liquid equivalent to their respective void fraction indicating no vapor pockets in the material. From these results, we propose a design property window for potential new porous materials for use in the dry-shippers.

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来源期刊
Cryogenics
Cryogenics 物理-热力学
CiteScore
3.80
自引率
9.50%
发文量
0
审稿时长
2.1 months
期刊介绍: Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics
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