期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
细水雾粒度与流量对瓦斯爆炸下限的影响试验研究
1
作者 薛少谦 《煤矿安全》 CAS 北大核心 2015年第12期11-14,共4页
通过自建的细水雾抑爆试验系统,分别测试了不同细水雾粒度、流量下瓦斯爆炸下限,根据试验结果,从理论上分析了细水雾粒度、流量对瓦斯爆炸的抑制过程,发现细水雾与自由基碰撞销毁在抑制瓦斯爆炸反应中的作用比其它因素要小。通过分析得... 通过自建的细水雾抑爆试验系统,分别测试了不同细水雾粒度、流量下瓦斯爆炸下限,根据试验结果,从理论上分析了细水雾粒度、流量对瓦斯爆炸的抑制过程,发现细水雾与自由基碰撞销毁在抑制瓦斯爆炸反应中的作用比其它因素要小。通过分析得到了细水雾粒度、流量对瓦斯爆炸下限的影响规律:试验条件下,水雾粒度越小,水雾流量越大,瓦斯爆炸下限越高;水雾粒度参数在对瓦斯爆炸下限的影响中起主要作用,水雾流量参数起次要作用。 展开更多
关键词 水雾 水雾粒度 水雾流量 瓦斯爆炸 抑爆
原文传递
Numerical Simulation of Atomization due to Flood Discharges of Hydropower Stations 被引量:5
2
作者 练继建 刘昉 张华 《Transactions of Tianjin University》 EI CAS 2006年第5期341-345,共5页
To mitigate the damages produced by flood discharges of hydropower stations, a three-dimensional numerical model of the aerated water jet restricted by gravity, air resistance and air buoyancy is proposed. Based on th... To mitigate the damages produced by flood discharges of hydropower stations, a three-dimensional numerical model of the aerated water jet restricted by gravity, air resistance and air buoyancy is proposed. Based on theoretical analysis and prototype data, a three-dimensional stochastic model is constructed using Monte Carlo method to evaluate the range of atomization and intensity of rainfall in gorges, which are strongly affected by complex terrain and various wind conditions. The prototype data observed from two hydropower stations are selected in the feedback and verification analysis to verify the proposed model. The result shows that the computational solutions fit the prototype data well. This model can be used to forecast the atomization of a hydropower station that is being designed or constructed. 展开更多
关键词 ATOMIZATION numerical simulation Monte Carlo method spraying
下载PDF
Impact energy analysis of turbulent water sprays for continuous centrifugal concentration 被引量:1
3
作者 任南琪 陈禄政 熊大和 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第1期91-95,共5页
A SLon full-scale continuous centrifugal concentrator was used to reconcentrate hematite from a high gradient magnetic separation concentrate to study the effect of impact angle, concentrate mass and drum rotation spe... A SLon full-scale continuous centrifugal concentrator was used to reconcentrate hematite from a high gradient magnetic separation concentrate to study the effect of impact angle, concentrate mass and drum rotation speed on the impact energy of turbulent water sprays for continuous centrifugal concentration, under conditions of feed volume flow rate around 9 m3/h, feed solid concentration of 25%-35% and reciprocating velocity of water sprays at 0.05 m/s. The results indicate that a minimal critical impact energy is required in the water sprays for achieving continuous concentration of the concentrator; an unfitted impact angle reduces the impact efficiency, and the highest impact efficiency of 0.6416 is found at the mpact angle of 60°; the increase in concentrate mass leads to an increase in impact energy, and the highest impact efficiency is maintained when the concentrate mass varies in the range of 0.44-0.59 kg/s; when the concentrate mass and the pressure of water sprays are kept at around 0.45 kg/s and in the range of 0.4-0.6 MPa respectively, the impact energy increases proportionally with the increase of drum rotation speed. 展开更多
关键词 centrifugal concentration turbulent impact HEMATITE RECONCENTRATION
下载PDF
水雾对调Q Er:YAG激光消融牙本质阈值及损伤的影响 被引量:2
4
作者 崔庆哲 魏蒙恩 +3 位作者 凌琳 程庭清 吴先友 江海河 《中国激光》 EI CAS CSCD 北大核心 2016年第12期26-31,共6页
研究了调QEr:YAG激光消融离体牙本质过程中水雾的作用及其对消融后牙本质微结构的影响。调QEr:YAG激光重复频率为3Hz,脉冲宽度为62ns,作用脉冲数为10,能量范围为4~70mJ,水雾流量分别为0,4,9,13mL/min时消融牙本质。每种实验... 研究了调QEr:YAG激光消融离体牙本质过程中水雾的作用及其对消融后牙本质微结构的影响。调QEr:YAG激光重复频率为3Hz,脉冲宽度为62ns,作用脉冲数为10,能量范围为4~70mJ,水雾流量分别为0,4,9,13mL/min时消融牙本质。每种实验条件下消融10个牙本质样品,利用扫描电镜观察消融坑洞微结构。实验结果表明,随着水雾流量的增加,调QEr:YAG激光对人牙本质的消融阈值呈逐渐增加的趋势,牙本质所受机械损伤减小。实验结果对了解调QEr:YAG激光消融牙硬组织的微观结构及牙科治疗应用具有参考价值。 展开更多
关键词 激光技术 调Q ER:YAG激光 水雾流量 牙本质 组织消融
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部