{"title":"Thermal conductivity measurement of TBAB hydrate by the transient hot-wire using parylene-coated probe","authors":"T. Nagatomi, Y. Taguchi, R. Ohmura, Y. Nagasaka","doi":"10.1299/KIKAIB.79.1155","DOIUrl":null,"url":null,"abstract":"©2013 The Japan Society of Mechanical Engineers Semiclathrate hydrate consists of cage structures composed of water molecules and ionic large guest molecules, which distinguish semiclathrate hydrate from normal clathrate hydrate. Semiclathrate hydrate is stable under atmospheric pressure condition and at near room temperature. This is the reason semiclathrate hydrate is expected to be used in various novel technologies, for example use as a cool-energy storage agent and gas separator. However, there is little knowledge about thermophysical properties of semiclathrate hydrate. Up to the present, few experimental data on its thermal conductivity have been reported. Thermal conductivity is necessary for the evaluation of industrial formation process of semiclathrate hydrate and heat transfer performance of semiclathrate hydrate used as cool-energy storage agent. The present paper reports measurements of the thermal conductivity of Tetra Butyl Ammonium Bromide (TBAB) hydrate by the transient hot-wire technique using a newly developed Parylene-coated probe, in which a metallic wire is coated with a thin electrical insulation layer formed by a chemical vapor deposition of poly-para-xylyene polymer. In order to confirm the reliability of the probe, we have performed check measurements on the thermal conductivity of toluene and water. We have measured the thermal conductivity of TBAB hydrate in the temperature range from 193 to 282 K with the uncertainty of ±2 %. It is found that the thermal conductivity of TBAB hydrate is less than 17 % of that of ice with almost no temperature dependence and its absolute value is lower than that of normal clathrate hydrate such as methane hydrate.","PeriodicalId":331123,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. B","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2013-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transactions of the Japan Society of Mechanical Engineers. B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1299/KIKAIB.79.1155","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
瞬态热线法测量TBAB水合物的热导率
©2013日本机械工程师学会半水合物由水分子和离子大客体分子组成的笼状结构组成,这区分了半水合物和普通水合物。半盐水合物在常压条件下和接近室温条件下是稳定的。这就是为什么半盐水合物有望用于各种新技术,例如用作冷储能剂和气体分离器。然而,人们对半盐水合物的热物理性质了解甚少。迄今为止,关于其导热性的实验数据报道较少。热导率是评价半净水合物工业生成过程和半净水合物作为蓄冷剂传热性能的必要条件。本文报道了一种新开发的聚对二甲苯包覆探针,在金属丝上包覆一层由聚对二甲苯聚合物化学气相沉积形成的薄电绝缘层,利用瞬态热线技术测量了四丁基溴化铵(TBAB)水合物的热导率。为了证实探针的可靠性,我们对甲苯和水的热导率进行了检查测量。我们测量了TBAB水合物在193 ~ 282 K温度范围内的热导率,不确定度为±2%。结果表明,TBAB水合物的导热系数小于冰的17%,几乎不受温度的影响,其绝对值低于甲烷水合物等普通包合物水合物的导热系数。
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