Moist air permeability characteristics of flexible contact gaskets used in refrigerators

IF 3.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

Flexible contact gasket is a significant component affecting the sealing performance of the refrigerator. However, few studies were conducted on the permeability characteristics of moist air through refrigerator gaskets. The purpose of this study is to explore the permeability characteristics including permeation paths size, flow type, modeling and temperature-humidity-pressure-structure effect. The characteristic scale of the interface of permeation paths is observed as 10−5 m in the free-state by atomic force microscope. The equation of Knudsen number and contact stress relation is established to judgment the flow types. By comparing the critical and simulated contact stresses, it is inferred that moist air simultaneously occurs slip, transition and free-molecular flows. A multi-scale coupling model of permeation rate is constructed to obtain the apparent permeability coefficient characterizing the permeability intensity. The air pressure difference affects the permeability characteristics in the form of direct driving force and changing the contact stress of the interfaces. Free-molecular flow mainly occurs under the negative pressure condition with inhalation coefficient of 2.26 × 10−5∼2.84 × 10−5 m2, while the slip flow mainly occurs under the positive pressure conditions with exhalation coefficient of 2.87 × 10−5∼4.65 × 10−5 m2. The essence of enhancing the sealing performance of structural improvement is to increase the contact stress and length of permeation path. By increasing the height, increasing the inclination angle, adding the auxiliary edges and adding an auxiliary airbag, the inhalation coefficient of moist air, the exhalation coefficient of moist air and the inhalation coefficient of water vapor are decreased by 54.82 %, 51.46 % and 66.04 %.

冰箱中使用的柔性接触垫片的透湿特性
柔性接触垫片是影响冰箱密封性能的重要部件。然而,有关湿空气通过冰箱密封垫的渗透特性的研究却很少。本研究的目的是探讨渗透特性,包括渗透路径尺寸、流动类型、模型和温度-湿度-压力-结构效应。通过原子力显微镜观察,自由状态下渗透路径界面的特征尺度为 10 米。建立了努森数方程和接触应力关系式,以判断流动类型。通过比较临界接触应力和模拟接触应力,推断出潮湿空气中同时存在滑移流、过渡流和自由分子流。构建了渗透率的多尺度耦合模型,得到表观渗透系数,表征了渗透强度。气压差以直接驱动力和改变界面接触应力的形式影响渗透特性。自由分子流主要发生在负压条件下,吸入系数为 2.26×10∼2.84×10 m,而滑移流主要发生在正压条件下,呼出系数为 2.87×10∼4.65×10 m。通过增加高度、增加倾角、增加辅助边缘和增加辅助气囊,潮湿空气的吸入系数、潮湿空气的呼出系数和水蒸气的吸入系数分别降低了 54.82%、51.46% 和 66.04%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.30
自引率
12.80%
发文量
363
审稿时长
3.7 months
期刊介绍: The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.
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