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Influence of bluff body shape on wall pressure distribution in vortex flowmeter 被引量:3
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作者 孙志强 李志勇 +1 位作者 蒋赟 周宏亮 《Journal of Central South University》 SCIE EI CAS 2013年第3期724-729,共6页
To investigate the influence of bluff body shape on wall pressure distribution in a vortex flowmeter,experiments were conducted on a specially designed test section in a closed water rig at Reynolds numbers of 6.2... To investigate the influence of bluff body shape on wall pressure distribution in a vortex flowmeter,experiments were conducted on a specially designed test section in a closed water rig at Reynolds numbers of 6.2×10 4-9.3×10 4.The cross sections of the bluff bodies were semicircular,square,and triangular shaped,and there were totally 21 pressure tappings along the conduit to acquire the wall pressures.It is found that the variation trends of wall pressures are basically identical regardless of the bluff body shapes.The wall pressures begin to diverge from 0.3D(D is the inner diameter of the vortex flowmeter) in front of the bluff body due to the diversity in shape,and all reach the minimum values at 0.3D behind the bluff body.A discrepancy between the triangular or square cylinder and the semicircular cylinder in wall pressure change is observed at 0-0.1D behind the bluff body.It is also found that the wall pressures and irrecoverable pressure loss coefficients increase with flow rates,and the triangular cylinder causes the smallest irrecoverable pressure loss at a fixed flow rate. 展开更多
关键词 vortex flowmeter bluffbody shape wall pressure irrecoverable pressure loss
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A METHOD TO IMPROVE DIMENSIONAL STABILITY OF PF PARTICLEBOARD
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作者 Wang Fenghu Yu JingNortheast Forestry UniversitySong KuiyanYichun Reconnaissance and Designing Institute of Forestry 《Journal of Northeast Forestry University》 SCIE CAS CSCD 1993年第2期93-97,共5页
A method of alkaline pretreatment of particles was designed to produce three types of chips. The pretreatmentet of particles in 1% water solution of NaOH for 30 minutes offered a possibility of producing PF bonded par... A method of alkaline pretreatment of particles was designed to produce three types of chips. The pretreatmentet of particles in 1% water solution of NaOH for 30 minutes offered a possibility of producing PF bonded particleboards with minimal irrecoverable swell and a reduction in thickness swelling. The method used in this work could be used to produce more stable PF particeboard. 展开更多
关键词 PF particleboard Alkaline pretreatment irrecoverable swell Thickness swelling Dimensional stability.
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Pt-Al<sub>2</sub>OM<sub>3</sub>Composite Material Designed for Cyclic Production of Optical Glasses under High Temperature Conditions
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作者 Aleksandr Bochegov Aleksandr Ermakov Irina Vandysheva 《Journal of Materials Science and Chemical Engineering》 2014年第3期30-36,共7页
The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverabl... The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverable losses of platinum products and alloys when operating under high temperature conditions, particularly for glassblowing and single crystal growing crucibles. A two-layered composite material based on platinum-group metals and corundum plasma ceramics is thoroughly investigated. A successful experience of crucibles exploitation, designed for production of high temperature optical glasses from the composite and results of the research on composite material specimens are described. 展开更多
关键词 Sandwich-Structured Composite Material Plasmaceramics Platinum-Group Metals Reduction of Metal Consumption Crucibles for Glassblowing and Single Crystal Growing HIGH TEMPERATURE Creep HIGH TEMPERATURE Strength and Heat Resistance irrecoverable Losses
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