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Y型喷嘴反压环境粒径的图像捕捉测量技术 被引量:2
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作者 王丹 陈鹏飞 +1 位作者 杨岸龙 李龙飞 《航空动力学报》 EI CAS CSCD 北大核心 2018年第1期174-181,共8页
鉴于Y型喷嘴反压条件下的粒径难以采用传统光学测量手段获得有效数据,提出一种基于图像捕捉的粒径处理程序,通过微距镜头拍摄雾场图像,通过图像识别和数据统计获取有效索太尔平均直径(SMD)。该处理方法在大气下与相位多普勒粒子分析仪(P... 鉴于Y型喷嘴反压条件下的粒径难以采用传统光学测量手段获得有效数据,提出一种基于图像捕捉的粒径处理程序,通过微距镜头拍摄雾场图像,通过图像识别和数据统计获取有效索太尔平均直径(SMD)。该处理方法在大气下与相位多普勒粒子分析仪(PDPA)测量结果误差不超过12%。实验结果表明:在反压条件下,当气流量为0g/s时,雾化粒径较大,随着环境压力升高和液流量增大,雾化粒径呈减小趋势;当加入气流量为5.5g/s时,雾化粒径显著降低,并且粒径随着环境压力升高而增大(该结果与不加气时恰恰相反),而在同一反压、不同液流量工况下,雾化粒径基本保持不变。在燃烧室变工况条件下,加入少量的气体即可使雾化粒径显著减小且在变工况条件下基本保持一致。 展开更多
关键词 Y型喷嘴 图像识别 索太尔平均粒径(SMD) 反压条件 雾化实验
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Gas-Liquid Mass Transfer in a Slurry Bubble Column Reactor under High Temperature and High Pressure 被引量:6
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作者 杨卫国 王金福 金涌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2001年第3期253-257,共5页
The gas-liquid mass transfer of H2 and CO in a high temperature and high-pressure three-phase slurry bubble column reactor is studied. The gas-liquid volumetric mass transfer coefficients kLa are obtained by measuring... The gas-liquid mass transfer of H2 and CO in a high temperature and high-pressure three-phase slurry bubble column reactor is studied. The gas-liquid volumetric mass transfer coefficients kLa are obtained by measuring the dissolution rate of H2 and CO. The influences of the main operation conditions, such as temperature, pressure, superficial gas velocity and solid concentration, are studied systematically. Two empirical correlations are proposed to predict kLa values for H2 and CO in liquid paraffin/solid particles slurry bubble column reactors. 展开更多
关键词 gas-liquid mass transfer high temperature high pressure slurry bubble column
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Liquid Axial Mixing in Packed Tower at Elevated Pressure
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作者 唐忠利 张鹏 +2 位作者 周鹍 刘春江 余国琮 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第1期106-109,共4页
Liquid phase axial mixing was measured with the tracer technique in a packed column with inner diameter of 0.15m, in which the structured packing, Mellapak 350Y, was installed. Tap water as the liquid phase flowed dow... Liquid phase axial mixing was measured with the tracer technique in a packed column with inner diameter of 0.15m, in which the structured packing, Mellapak 350Y, was installed. Tap water as the liquid phase flowed down through the column and stagnant gas was at elevated pressure ranging from atmospheric to 2.0MPa. The model parameters of Bo and 9 were estimated with the least square method in the time domain. As liquid flow rate was increased, the liquid axial mixing decreased. Under our experimental conditions, the effect of pressure on Bo number on single liquid phase was negligible, and eddy diffusion was believed to be the primary cause of axial mixing in liquid phase. 展开更多
关键词 axial mixing eddy diffusion elevated pressure structured packing
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Exploring valid internal-control genes in Porphyra yezoensis(Bangiaceae) during stress response conditions 被引量:3
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作者 王文磊 吴晓洁 +5 位作者 王超 贾兆君 何林文 韦一凡 牛建峰 王广策 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第4期783-791,共9页
To screen the stable expression genes related to the stress (strong light, dehydration and temperature shock) we applied Absolute real-time PCR technology to determine the transcription numbers of the selected test ... To screen the stable expression genes related to the stress (strong light, dehydration and temperature shock) we applied Absolute real-time PCR technology to determine the transcription numbers of the selected test genes in Porphyra yezoensis, which has been regarded as a potential model species responding the stress conditions in the intertidal. Absolute real-time PCR technology was applied to determine the transcription numbers of the selected test genes in Porphyra yezoensis, which has been regarded as a potential model species in stress responding. According to the results of photosynthesis parameters, we observed that Y(II) and Fv/Fm were significantly affected when stress was imposed on the thalli of Porphyra yezoensis, but underwent almost completely recovered under normal conditions, which were collected for the following experiments. Then three samples, which were treated with different grade stresses combined with salinity, irradiation and temperature, were collected. The transcription numbers of seven constitutive expression genes in above samples were determined after RNA extraction and cDNA synthesis. Finally, a general insight into the selection of internal control genes during stress response was obtained. We found that there were no obvious effects in terms of salinity stress (at salinity 90) on transcription of most genes used in the study. The 18S ribosomal RNA gene had the highest expression level, varying remarkably among different tested groups. RPS8 expression showed a high irregular variance between samples. GAPDH presented comparatively stable expression and could thus be selected as the internal control. EF-la showed stable expression during the series of multiple-stress tests. Our research provided available references for the selection of internal control genes for transcripts determination of P. yezoensis. 展开更多
关键词 constitutive expression gene housekeeping gene Porphyra yezoensis Ueda real-timequantitative PCR stress responding
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