Experimental Study on Formation of Stable Flow Layer from Composite Flow Networks Using Flip-Flop Flow

利用触发器流从复合流网络形成稳定流层的实验研究

• 批准号: 16560164
• 负责人: UMEDA Shinzaburo
• 金额: $ 2.18万
• 依托单位: FUKUYAMA University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560164/
• 关键词: Diamond-shaped cylinder bundle; Flip-flop flow; Flow visualization; PIV; Composite flow networks; Stable flow laver; Multiple phase phenomenon; Environmental control device; アンビバレント流れ; PIV計測; エッジトーン現象

The film-forming technology utilizing thin-film jet flow is applicable in maintaining freshness in food products and protecting operational environments of electronics systems. Such a thin-film jet may be produced in a conventional flow network consisting of multiple intersecting flow passages formed by a diamond-shaped flow islands (to be called cylinders). Recently, a new type of intersecting flow network, to be referred to as composite flow network, was developed consisting of a conventional flow network superposed with a co-current thin film flow. Subsequently, a different type of composite flow network was constructed consisting of a thin-film flow sandwiched in between two conventional flow networks in an attempt to stabilizing and thus extending the thin-film flow.The aim of the present study is to clarify fluid flow characteristics of three different types : first on a conventional flow network, second on a three-layered composite flow network(F-A duct), and third on a three-layered composite flow network with slit flow(F-A duct with a slit). Each experiment consists of applications of flow visualization method and two-dimensional particle image velocimetry (PIV).It is disclosed from the study that :(1)Mutual interference between the symmetrical flip-flop flow oscillation in F-A duct and the longitudinal vortices generated in the F-A duct with a slit located downstream results in a symmetrical efflux.(2)The existing jet streams bundle up firmly and form a flow in layers. The presence of intersecting flow in F-A duct with a slit causes the formation of stable flow layer downstream and strengthening (elongating) the efflux.

利用薄膜射流的成膜技术适用于保持食品的新鲜度和保护电子系统的操作环境。这种薄膜射流可以在由多个交叉流动通道组成的常规流动网络中产生，所述多个交叉流动通道由菱形流动岛（将被称为圆柱体）形成。最近，一种新型的交叉流网络，被称为复合流网络，由一个传统的流网络叠加并流薄膜流。随后，一种不同类型的复合流网络被构造成夹在两个传统的流网络之间的薄膜流，试图稳定并因此扩展薄膜流。本研究的目的是澄清三种不同类型的流体流动特性：第一种是在常规流动网络上，第二种是在三层复合流动网络（F-A管道）上，第三种是在具有狭缝流动的三层复合流动网络（具有狭缝的F-A管道）上。研究结果表明：（1）F-A通道内对称的翻转流动振荡与下游有狭缝的F-A通道内产生的纵向涡相互干扰，产生对称的射流;（2）现有的射流束结牢固，形成层状流动。在带狭缝的F-A通道中，交叉流的存在导致下游形成稳定的流动层，并加强（拉长）了射流。

项目成果

Self-Sustained Flow Oscillations due to Flow・Surface Interaction

由于流动与表面相互作用而产生的自持流动振荡

• 发表时间: 2005
• 期刊: The 16^th International Symposium on Transport Phenomena
• 作者: Magariyama;Y.;Kudo;S.;Goto;T.;Takano;Y.;Sinzaburo Umeda;Wen-Jei Yang;Sinzaburo Umeda;Wen-Jei Yang;Shinzaburo Umeda;Shinzaburo Umeda;Shinzaburo Umeda;Wen-Jei Yang
• 通讯作者: Wen-Jei Yang

LDVを用いた菱形角柱群流路内の分流領域における流速変動計測

使用 LDV 测量菱形通道导流区域的流速波动

• 发表时间: 2004
• 期刊: 可視化情報 Vol.24, No.11
• 作者: S.Umeda;S.Manmoto;K.Horii;Shinzaburo Umeda;Shinzaburo Umeda;長谷川盛三;谷口輝
• 通讯作者: 谷口輝

PIVを用いた複合ネットワーク管路からの流出噴流の可視化

使用 PIV 可视化复杂网络管道的流出射流

• 发表时间: 2005
• 期刊: 可視化情報 Vol.25, Supp1. No. 2
• 作者: Magariyama;Y.;Kudo;S.;Goto;T.;Takano;Y.;Sinzaburo Umeda;Wen-Jei Yang;Sinzaburo Umeda;Wen-Jei Yang;Shinzaburo Umeda;Shinzaburo Umeda;Shinzaburo Umeda;Wen-Jei Yang;Shinzaburo Umeda;Shinzaburo Umeda;梅田眞三郎
• 通讯作者: 梅田眞三郎

Characteristics of Flip-Flop Flows in Diamond-Shaped Cylinder Bundles

菱形筒束中的触发器流动特性

• 发表时间: 2004
• 期刊: Transactions of the Japan Society of Mechanical Engineers Vol.70, No.699
• 作者: S.Umeda;S.Manmoto;K.Horii;Shinzaburo Umeda;Shinzaburo Umeda;長谷川盛三;谷口輝;梅田眞三郎;Shinzaburo Umeda;Shinzaburo Umeda;Sheizo Hasegawa;Akira Taniguchi;Shinzaburo Umeda
• 通讯作者: Shinzaburo Umeda

Interfacial phenomena between flow network and superposed thin-film flow

流网络与叠加薄膜流之间的界面现象

• 发表时间: 2005
• 期刊: The Six World Conference on Experimental Heat Transfer Fluid Mechanics
• 作者: Magariyama;Y.;Kudo;S.;Goto;T.;Takano;Y.;Sinzaburo Umeda;Wen-Jei Yang;Sinzaburo Umeda;Wen-Jei Yang;Shinzaburo Umeda;Shinzaburo Umeda
• 通讯作者: Shinzaburo Umeda