Particle sizing in dense two-phase droplet systems by ultrasonic attenuation and velocity spectra

来源 :Science in China(Series E:Technological Sciences) | 被引量 : 0次 | 上传用户:deepseaxing2
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Size and size distribution of particles in particulate two-phase flow play an important role in a wide variety of industrial areas,while their measurement still remains a hard task till now.Ultrasonic wave as a mechanical vibration contains plenty of information about medium when it passes through.Thus the size distribution could be extracted from the measured ultrasonic attenuation and velocity spectra by means of well established models and data processing techniques.This paper contributes to the extraction of information of droplet size of a two-phase fat emulsion simultaneously from signals of broad-band ultrasonic attenuation and velocity spectra.According to the formulated single particle scattering model,the relationship between particle size distribution and ultrasonic spectrum is estab-lished.The sensitivities of ultrasonic spectra to the variation of particle size are illustrated.Distin-guishing features for attenuation and velocity spectra are summarized.Demonstration calculations of inversion by optimum regularization factor method are carried out to yield the typical numerical results for discussion.Based on the proposed inversion algorithm and theoretical model,a fat emulsion sam-ple with a volume fraction up to 20% is measured and analyzed.To validate the proposed ultrasonic spectrum particle sizing method,the results are compared to those obtained from optical measure-ment. Size and size distribution of particles in particulate two-phase flow play an important role in a wide variety of industrial areas, while their measurement still remains a hard task till now. Ultrasonic wave as a mechanical vibration contains plenty of information about medium when it passes through.Thus the size distribution could be extracted from the measured ultrasonic attenuation and velocity spectra by means of well established models and data processing techniques. This paper contributes to the extraction of information of droplet size of a two-phase fat emulsion simultaneously from signals of broad-band ultrasonic attenuation and velocity spectra. According to the formulated single particle scattering model, the relationship between particle size distribution and ultrasonic spectrum is estab-lished. The sensitivities of ultrasonic spectra to the variation of particle size are illustrated. Distin-guishing features for attenuation and velocity spectra are summarized. Demonstration calcul ations of inversion by optimum parameterization for discussion. Based on the proposed inversion formula and theoretical model, a fat emulsion sam-ple with a volume fraction up to 20% is measured and analyzed. To validate the proposed ultrasonic spectrum particle sizing method, the results are compared to those obtained from optical measure-ment.
其他文献
从1981年7月至1982年6月,为了掌握训练的需要,我们对参加“中长跑‘体力波’训练研究组”训练研究的运动员,经常进行血红蛋白检测,发现血红蛋白的数值在训练过程中是一个很
一段时间以来,一个企业家的名字传遍神州大地。人们称道他的业绩,颂扬他的精神,更关心着他与死神抗争的生命…… 然而,不幸的消息终于传来:长期积劳成疾的马恩华,保定国棉一
日本水井塑料工业公司投资建设的大连永井塑料制品有限公司,日前在大连保税区正式投产。 大连永井塑料制品有限公司总投资420万美元,是由日本永井塑料工业公司、日本明和产
介绍中海石油二期合成氨装置采用的KBR深冷净化工艺,分析冷箱及膨胀机的试车和运转情况以及存在的一些问题,阐述通过增强保冷效果和对冷箱及管道进行吹扫,使整个装置稳定运行
蚯蚓是陆生生物与土壤生物之间传递污染物的桥梁,能很好的指示土壤环境的变化。农药的广泛使用,必然对蚯蚓的生态、生长和繁殖产生种种不利的影响。化学物质对蚯蚓的影响及毒性
在紧束缚框架下用Recursion方法计算了高Co Ni二次硬化钢的电子结构 ,替位和间隙固溶元素的局域态密度。通过总态密度的积分计算了体系的费米能及原子间相互作用的键级积分 ,
老鹰和母鸡(俄罗斯) 按抽签结果,一个队派一代表做鹰,另一队做母鸡。母鸡们排成纵队,排尾是一个小鸡,后面人抱住前面人的腰。听信号鹰设法触到小鸡。母鸡们则随时面对鹰并拦
AIM: To identify the role of alpha-fetoprotein (AFP) mRNA expression in peripheral blood one week after surgery as a predictor for recurrence of hepatocellular
以往多数学者认为树突状细胞(dendriticcells,DC)具有激活免疫的功能,但是,近年来愈来愈多的实验证明,DC具有负相调节免疫的功能,其可通过诱导T细胞失能、使免疫反应偏移、诱
迈过不惑之年的曹新生,似乎有挥洒不尽的精力,井上井下、机关基层,到处都有他的身影。作为宣传部长,他不但思维敏捷,笔锋犀利,更重要的是他有爱矿如家、守土有责的坚实信念