检索结果-南通市图书馆

Experimental and Numerical Investigation of the Diffusion of a Confined Wall Jet through a Perforated Plate

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Fluid Dynamics 2022年第2期12卷 168-212页

作者： Moussa Diop Denis flick Graciela Alvarez Jean Moureh Refrigerating Process Engineering Unit INRAE Antony Antony France Université Paris Saclay INRAE AgroParisTech UMR SayFood Massy France

When performing numerical modeling of fluid flows where a clear medium is adjacent to a porous medium, a degree of difficulty related to the condition at the interface between the two media, where slip velocity exists, is encountered. A similar situation can be found when a jet flow interacts with a perforated plate. The numerical modeling of a perforated plate by meshing in detail each hole is most often impossible in a practical case (many holes with different shapes). Therefore, perforated plates are often modeled as porous zones with a simplified hypothesis based on pressure losses related to the normal flow through the plate. Nevertheless, previous investigations of flow over permeable walls highlight the impossibility of deducing a universal analytical law governing the slip velocity coefficient since the latter depends on many parameters such as the Reynolds number, porosity, interface structure, design of perforations, and flow direction. This makes the modeling of such a configuration difficult. The present study proposes an original numerical interface law for a perforated plate. It is used to model the turbulent jet flow interacting with a perforated plate considered as a fictitious porous medium without a detailed description of the perforations. It considers the normal and tangential effects of the flow over the plate. Validation of the model is realized through comparison with experimental data.

关键词： Perforated Plate Porous Medium Wall Jet Air Ventilation Aeraulic Turbulence Diffusion

Experimental Study of the Diffusion of a Confined Wall Jet through a Perforated Plate: Influence of the Porosity and the Geometry

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Fluid Dynamics 2022年第1期12卷 96-126页

作者： Moussa Diop Denis flick Graciela Alvarez Jean Moureh Refrigerating Process Engineering Unit INRAE Antony Antony France UMR SayFood AgroParisTech INRAE Université Paris Saclay Massy France

This paper investigated lateral diffusion of a confined two-dimensional wall jet (air inlet height: 5 cm) through a perforated plate. We considered two plates with porosities of and . The plates were positioned at distances of 10 cm and 20 cm below the jet inlet. The experiments were realized using 2D Laser Doppler Anemometer (LDA). Different profiles of mean and fluctuating velocities are presented. The presence of a perforated plate strongly modified the airflow pattern compared to an empty enclosure. The velocities above and below the plate depend on several parameters, including the porosity and the plate’s position relative to the inlet slot and the longitudinal position. The difference between the flow velocity above and below the plates could not be related using a universal formula that depends on these parameters. We also investigated the influence of a porous media of a height of 20 cm (a stack of spheres having a diameter of 3.75 cm) located below the perforated plate. The results highlight that the porous medium strengthens the effects of the perforated plate on the flow.

关键词： Porous Medium Perforated Plate Wall Jet Air Ventilation Aeraulic Turbulence Diffusion

The New Internet Scams

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

空中英语教室（高级版．彭蒙惠英语） 2009年第10期 11-12页

作者： Dvid flick

The Role of Anesthetics in the Development of Learning Disabilities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Role of Anesthetics in the Development of Learning Disab...

2014年全国小儿麻醉学术年会暨浙江省麻醉学学术年会

作者： Randall flick

＜正＞～～

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

设立板坯连铸技术的标准

钢铁 2004年第Z1期39卷 255-259页

作者： Andreas flick Karl Morwald Oliver Schulz VAI-奥钢联工程技术公司奥地利林茨

40多年前,连续铸造技术被引入市场,开始了其成功的工业化生产.如今,连铸率早已超过90%,为炼钢的经济生产作出了巨大贡献.革新和发展成为驱动力,使具有前瞻性和主动性的人们不断续写成功的故事.当提到标准时,每一阶段都有其与众不同的特... 详细信息

40多年前,连续铸造技术被引入市场,开始了其成功的工业化生产.如今,连铸率早已超过90%,为炼钢的经济生产作出了巨大贡献.革新和发展成为驱动力,使具有前瞻性和主动性的人们不断续写成功的故事.当提到标准时,每一阶段都有其与众不同的特质和优势.标准的设立从未停止过,而重点已有所不同.早期是尚待验证的基本工艺特点,而如今通过改善设备设计、自动化和工艺模型来推动生产率和经济的提高成为了这一行业的新标准和基点.本文介绍了从过去几十年的连铸标准直到当今板坯即连即铸标准的发展概况.

关键词：板坯连铸直接链接质量即连即铸自动化机器人紧凑型连铸机

High productivity slab casting of peritectic steel grades

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High productivity slab casting of peritectic steel grades

第八届全国连铸学术会议

作者： J. Watzinger A. Harvey A. flick Siemens VAI Metals Technologies GmbH ＆ Co Turmstrasse 44 P.O Box 4 A-4031 Linz/Austria Siemens VAI Metals Technologies GmbH ＆ Co Turmstrasse 44 P.O Box 4 A-4031 Linz/Austria Siemens VAI Metals Technologies GmbH ＆ Co Turmstrasse 44 P.O Box 4 A-4031 Linz/Austria

＜正＞In the second half of 2004 NANJING Iron ＆ Steel Co.（NISCO）started up a new plate production facility based on converter steel making,wide slab casting,walking beam furnace and rolling by a combined plate/Steckel mill. The concept challenges the caster to produce 150 mm thick slabs up to 3.250 m wide at a high quality level, which are direct charged into the reheat *** variety of steel grades is demanding including pipe grades X65 and X80. In particular the sensitive peritectic steel grades at large slab width showed the most difficulties in regard to surface *** features together with casting technologies and liquid steel quality that have contributed to the successful production of defect-free slabs will be *** influence of cast parameters on slab quality at stable high steel throughput up to 5.5 tons per minute will be systematically shown gathered from several test cast sequences of peritectic steel in the range of 0.10 to 0.14% carbon including micro-alloying elements.

关键词： peritectic steel high speed casting

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

三角互证与混合方法

2021年

作者： (德)伍威·弗里克(Uwe flick)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

创新是奥钢联连铸技术不断获得成功的关键

钢铁 2004年第Z1期39卷 51-54页

作者： K. Morwald A. flick C. Chimani M. Stiftinger 奥钢联 Austria

　　1前言　　回顾80年代末、90年代初,奥钢联及其在连铸技术的设计和供货方面的竞争对手都面临着不断变化的市场状况.　　……

关键词：创新奥钢联连铸技术市场状况设计竞争供货

应用奥钢联中厚板坯连铸技术的两个新范例——鞍钢的高生产率和IPSCO的3.2m超宽板坯生产

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

应用奥钢联中厚板坯连铸技术的两个新范例——鞍钢的高生产率和IP...