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31.
Winston Duo Wu Sean Xuqi Lin Xiao Dong Chen 《American Institute of Chemical Engineers》2011,57(6):1386-1392
In this article, a glass nozzle driven by piezoceramics is used to experimentally study the continuous generation of a stream of monodisperse droplets from the breakup of a liquid jet. The approach is demonstrated by examining the breakup dynamics of three distinct liquids. The droplet formation process has been found to be highly controllable and reproducible. The dependence of nozzle performance on liquid properties, flow rate, and disturbance frequency has been investigated. The ratio between the actual disturbance frequency and Reynolds number, ω, is employed at first to represent the operating range that facilitates monodisperse droplet formation. Then, the dimensionless quantity ω*, obtained by multiplying ω by the viscous characteristic time, r/(μ/ρ), has been shown to collapse the data for the lower and higher bounds of the actual disturbance frequency ranges that secure monodispersity of the droplets of all the samples tested. The impacts of liquid flow rate and disturbance frequency on the monodisperse droplet size and spacing between two neighboring droplets have been investigated and discussed. © 2010 American Institute of Chemical Engineers AIChE J, 2011 相似文献
32.
ABSTRACT The complete drying history of paper dried under an array of multiple round jets of air was determined. The drying rate – paper moisture content relations, determined as a continuous function by on–line measurements for about 80 sheets, permitted examination of the following parameters: basis weight 20 to 50 g/m2, which covers the tissue to communication paper range; initial moisture content 1.5 to 3 kg water/kg fibre; nozzle to paper spacing of 5, 7.6 & 8.5 nozzle diameters: nozzle plate open area ratio from 1.4 to 3.1%; jet Reynolds number in the range of 450 to 11.100. Three methods of quantifying the complete drying rate curves were tested. Use of the common assumption of drying rate linear with moisture content over the falling rate period gave inadequate representation. Secondly, the general method of Churchill for any transport process that has a transition between two asymptotic relations was applied for the fmt time to the drymg of paper. This approach gives 相似文献
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S N Ojha 《Bulletin of Materials Science》1992,15(6):527-542
Spray forming involves sequential gas atomization of a melt into a spray of fine droplets and their deposition on a substrate
to build up a high-density preform. The rapid solidification inherent in spray deposition generates refined, equiaxed and
low segregation microstructures. A number of promising features of this near-net shape manufacturing process are highlighted
and compared, wherever possible, with the conventional casting and PM techniques. Some commercial nozzles used to create spray
and mechanisms associated with spray generation are described. The consolidation of the droplets and the development of the
microstructure in the deposit are primarily governed by the nature of the spray and the thermal state of droplets on the deposition
surface. Several microstructural characteristics of the deposit are presented and their origin in spray deposition is discussed. 相似文献
37.
采用数值模拟方法对连铸电磁旋流水口内流体流动和夹杂物碰撞长大行为进行了研究.数值结果表明电磁旋流水口出口处流体流动扩张角与低熔点合金实验值相符.旋转磁场对浸入式水口内壁夹杂物沉积行为存在两个相反的作用:一方面旋转磁场作用加强了水口壁面处钢液的湍流流动,加速了夹杂物在水口内壁的沉积吸附速率;另一方面水口内壁附近夹杂物在旋转磁场产生的旋流作用下易被携带至水口中心,削弱了水口内壁对夹杂物的黏附.在上述两方面因素作用下,钢液区存在一个最佳磁感应强度可使水口内壁夹杂物沉积速率降至最低,从而减轻水口结瘤现象.
相似文献38.
多喷头静电纺丝研究进展 总被引:1,自引:1,他引:0
静电纺丝是制取纳米纤维的一种简单而经济的方法。静电纺丝产量低是该项技术从实验室走向产业化生产及应用的最大的技术障碍,喷头组装则是静电纺丝另一个主要的工艺问题。介绍了多喷头静电纺丝、多喷头静电纺丝电场和多喷头静电纺丝机的研究现状,指出了多喷头静电纺丝的研究方向。 相似文献
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由民用建筑锅炉房水雾喷头布置引发的思考 总被引:1,自引:1,他引:0
对《水喷雾灭火系统设计规范》中有效射程提出了不同的观点。阐述了理论计算与特性曲线之间的关系 ,论述了喷头平面布置间距及喷口与保护对象距离的直接计算方法 ,并对以建筑物为防护对象时的保护面积与喷头喷口距离的确定提出了建议 ,指出了目前国产水雾喷头特性曲线中存在的问题。呼吁行业主管部门尽快制定产品统一技术标准 ,以确保水喷雾灭火系统的安全运行 相似文献
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