Transactions of the Japan Society of Mechanical Engineers. B最新文献_第6页

Nondestructive evaluation of SCC on the surface of Ni-base alloy by microwaves 微波无损评价镍基合金表面SCC

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.959

T. Amano, Y. Ju, A. Hosoi

引用次数: 1

Formation process of vortex ring generated by a pulsating jet flow 脉动射流涡环的形成过程

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.546

Fujio Akagi, Yuuki Okuzono, Youichi Ando, Sumio Yamaguchi, M. Furukawa

{"title":"Formation process of vortex ring generated by a pulsating jet flow","authors":"Fujio Akagi, Yuuki Okuzono, Youichi Ando, Sumio Yamaguchi, M. Furukawa","doi":"10.1299/KIKAIB.77.546","DOIUrl":"https://doi.org/10.1299/KIKAIB.77.546","url":null,"abstract":"The formation process of a vortex ring generated by a pulsating jet flow, which is called the cyclic vortex ring, is investigated experimentally with PIV measurement. The waveform of the jet flow is conducted using sine curves by changing the amplitude of Reynolds' numbers Re0 of 1200-5040 and Womersley numbers α of 12.5-24.4. The results indicate that the formation process of the cyclic vortex ring is different from the laminar vortex ring. Another vortex ring which is formed from separated wall boundary layers in the nozzle during the suction period, which is called the separation vortex ring, is transported toward the nozzle exit during the discharge period. This separation vortex ring interferes with the formation process of the cyclic vortex ring at the nozzle exit plane. The circulation of the separation vortex ring depends on the pulsating conditions of the jet flow. Distribution of the vorticity around the core center of the cyclic vortex ring is in good agreement with the Oseen vortex model. The formation process of the cyclic vortex ring is classified into three categories, depending on Strouhal number.","PeriodicalId":331123,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130015836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Swirling flow behavior in a disk channel for planar-type SOFC 平面型SOFC圆盘通道内的旋流特性

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.76

K. Tsunoda, T. Kouda

{"title":"Swirling flow behavior in a disk channel for planar-type SOFC","authors":"K. Tsunoda, T. Kouda","doi":"10.1299/KIKAIB.77.76","DOIUrl":"https://doi.org/10.1299/KIKAIB.77.76","url":null,"abstract":"Swirling flow behavior between two parallel disk shape plates was experimentally investigated with the aid of a particle image velocimetry (PIV). The experiment was performed at low Reynolds numbers (Re < 100) to simulate the practical operation in a disk shape planar-type solid oxide fuel cell (SOFC). In the channel installed radial-type current collectors, unfavorable flow deceleration occurred toward downstream direction. Since this result suggested the necessity of improvement of flow uniformity, we designed a new channel with circle involute shape current collectors. In the new involute-type channel, a swirling flow was generated and its velocity was kept at nearly constant value toward the channel exit. This trend was observed regardless of flow rates, and hence flow uniformity was achieved over the wide range of Reynolds numbers. This is because a flow passage consisting of two adjacent involute shape current collectors functions as a constat-area channel due to the geometrical property of the circle involute. Furthermore, an estimation of a fluid motion in the involute-type channel was carried out by using steady state Euler's equation of motion. We confirmed that the velocity component in the flow direction was dominant compared with that in the other direction and played primary role to maintain a swirling motion through the centripetal acceleration term.","PeriodicalId":331123,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133872523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

低レイノルズ数域における後方ステップ流れの制御に関する研究（安定性解析を利用したSynthetic jetによる再付着流れの制御）关于低雷数域的后步流动控制的研究(利用稳定性分析的Synthetic jet控制再附着流动)

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.680

Shunsuke Yamada, Shinji Honami, Keita Okamoto, Takashi Nitta, Masahiro Motosuke, Hitoshi Ishikawa

引用次数: 4

Experimental study on rotational temperatures in nitrogen molecular beam 氮分子束旋转温度的实验研究

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.282

H. Yamaguchi, T. Moriyama, K. Ide, J. Ito, Y. Matsuda, T. Niimi

{"title":"Experimental study on rotational temperatures in nitrogen molecular beam","authors":"H. Yamaguchi, T. Moriyama, K. Ide, J. Ito, Y. Matsuda, T. Niimi","doi":"10.1299/KIKAIB.77.282","DOIUrl":"https://doi.org/10.1299/KIKAIB.77.282","url":null,"abstract":"Rotational energy distribution in a nitrogen molecular beam was experimentally studied by (2+2) N2-REMPI(Resonantly Enhanced Multiphoton Ionization). REMPI is known to have high detection sensitivity, which allows obtaining the signal under the very low number density condition like a molecular beam, successfully. Obtained REMPI spectrum was fitted by a theoretical spectrum to determine rotational temperature. The spectrum was well fitted, showing the rotational energy distribution obeyed the equilibrium Boltzmann distribution. The rotational temperature in a molecular beam must be similar to the frozen rotational temperature in a free jet, since a free jet is used as a beam source in the Kantrowitz-Grey type. The parameter p0d, which is a product of the source pressure p0 and the orifice diameter d, is known to characterize a free jet. Therefore, the rotational temperature in a molecular beam was analyzed in terms of the parameter p0d. The rotational temperature was able to be described by the power of the parameter p0d. The rotational temperature and the obtained function were compared with the value in literatures, which showed good agreement.","PeriodicalId":331123,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126594668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Simultaneous measurement of oxygen diffusivity and visualization of moisture distribution in gas diffusion layer with wettability distribution for improvement of polymer electrolyte fuel cell performance 基于润湿性分布的气体扩散层中氧气扩散率的同时测量和水分分布的可视化，以提高聚合物电解质燃料电池的性能

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2011-12-01 DOI: 10.1299/KIKAIB.77.2019

Ryo Koresawa, T. Daitoku, Y. Utaka, K. Uesugi

{"title":"Simultaneous measurement of oxygen diffusivity and visualization of moisture distribution in gas diffusion layer with wettability distribution for improvement of polymer electrolyte fuel cell performance","authors":"Ryo Koresawa, T. Daitoku, Y. Utaka, K. Uesugi","doi":"10.1299/KIKAIB.77.2019","DOIUrl":"https://doi.org/10.1299/KIKAIB.77.2019","url":null,"abstract":"The mass transfer characteristics of gas diffusion layer (GDL) are closely related to cell performance in polymer electrolyte fuel cell (PEFC). It is necessary to characterize the liquid water distribution, the microscopic conformation, and the oxygen diffusion coefficient in a GDL containing moisture. The configurations of a novel hybrid type GDL, in which two porous media with different wettabilities are arranged alternately (1),(2) and two porous media with different pore size distributions were alternately arranged (3), have been proposed with the aim of improving the oxygen diffusivity by controlling the moisture distribution in GDL porous media. However, the basic principles of hybrid type GDLs were examined in the former reports as a pilot study by using thicker media than those used in practice. It is thus necessary to elucidate the performance of the hybrid type GDLs with thinner sizes for the practical use. The present study examined a hybrid type GDL to control the liquid water behavior in the porous media. A carbon paper GDL used in practice for PEFCs with a wettability distribution due to adjacent hydrophilic and hydrophobic region was used as a test material. The measurement of oxygen diffusivity and visualization of liquid water in the GDL with wettability distribution were performed simultaneously using a galvanic battery type oxygen absorber and X-ray radiography, respectively.","PeriodicalId":331123,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134283372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

地下鉄系内気流の動的解析 : 実測とシミュレーション(流体工学,流体機械) 地铁系统内气流动态分析:实测与模拟(流体工程学，流体机械)

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2010-12-25 DOI: 10.1299/KIKAIB.76.772_2105

宣治森井, 努大塚, 明彦水島, 邦宣宇波

引用次数: 0

修正Building-Cube法による非圧縮性流体解析(流体工学,流体機械) 修正Building-Cube法による非圧縮性流体解析(流体工学,流体機械)

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2010-12-25 DOI: 10.1299/KIKAIB.76.772_2018

昌俊渡邉, 和博中橋

引用次数: 0

プッシュプル完全局排方式に関する基礎研究 : 第2報,プッシュプル流れの乱れ特性(流体工学,流体機械) 推拉完全站排方式基础研究:第2期报告，推拉流的紊乱特性(流体工程学，流体机械)

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2010-12-25 DOI: 10.1299/KIKAIB.76.772_2002

幸廣服部, 功一中林, 修己鬼頭, 基之伊藤

引用次数: 0

非定常高せん断流れ場における変形挙動を再現する赤血球モデルの構築(流体工学,流体機械) 再现非稳态高剪流场变形行为的红血球模型的构建(流体工程学，流体机械)

Transactions of the Japan Society of Mechanical Engineers. B Pub Date : 2010-12-25 DOI: 10.1299/KIKAIB.76.772_2118

貞雄別所, 匡徳中村, 成生和田

引用次数: 1