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Effect of nozzle geometry on pressure drop in submerged gas injection

Journal of Central South University 2019年第8期26卷 2068-2076页

作者： XIAO Jun-bing YAN Hong-jie LIU Liu School of Energy Science and Engineering Central South University Changsha 410083 China Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Dresden 01328 Germany Chair of Imaging Techniques in Energy and Process Engineering Technische Universitat Dresden 01062 Germany

Submerged gas injection into liquid leads to complex multiphase flow, in which nozzle geometries are crucial important for the operational expenditure in terms of pressure drop. The influence of the nozzle geometry on pressure drop between nozzle inlet and outlet has been experimentally studied for different gas flow rates and bath depths. nozzles with circular, gear-like and four-leaf cross-sectional shape have been studied. The results indicate that, besides the hydraulic diameter of the outlet, the orifice area and the perimeter of the nozzle tip also play significant roles. For the same superficial gas velocity, the average pressure drop from the four-leaf-shaped geometry is the least. The influence of bath depth was found negligible. A correlation for the modified Euler number considering the pressure drop is proposed depending on nozzle geometric parameter and on the modified Froude number with the hydraulic diameter of the nozzle do as characteristic length.

关键词： submerged gas injection nozzle geometry hydraulic diameter pressure drop modified Euler number

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Influence of Diesel nozzle geometry on Cavitation Using Eulerian Multi-Fluid Method

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Transactions of Tianjin University 2010年第1期16卷 33-39页

作者：张军杜青杨延相 Internal Combustion Engine Research Institute Tianjin University State Key Laboratory of Engines Tianjin University

Dependent on automatically generated unstructured grids, a comprehensive computational fluid dynamics(CFD)numerical simulation is performed to analyze the influence of nozzle geometry on the internal flow characteristics of a multi-hole diesel injector with the multi-phase flow model based on Eulerian multi-fluid *** diesel components in nozzle are considered as two continuous phases, diesel liquid and diesel vapor *** that both of them are fully coupled and interpenetrated, sepa...

关键词： diesel injection cavitation nozzle geometry multi-phase flow numerical simulation

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Cold model on bubble growth and detachment in bottom blowing process

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 213-221页

作者： Hong-jie YAN Jun-bing XIAO Yan-po SONG Zhi-wen HU Zhi-kai TAN Liu LIU School of Energy Science and Engineering Central South University Changsha 410083 China Hunan Key Laboratory of Energy Conservation in Process Industry Central South University Changsha 410083 China

The bubble growth and detachment behavior in the bottom blowing process were investigated. Four multi-hole nozzle configurations with different opening ratios were assessed experimentally using high-speed photography and digital image processing. For these configurations, the experiments reveal that the bubble growth consists of a petal-like stage, an expansion stage and a detachment stage. The petal-like shape is qualitatively described through the captured images, while the non-spherical bubbles are analyzed by the aspect ratio. The bubble size at the detachment is quantified by the maximum caliper distance and the bubble equivalent diameter. Considering the dependence on the opening ratio, different prediction models for the ratio of maximum caliper distance to hydraulic diameter of the nozzle outlet and the dimensionless bubble diameter are established. The comparative analysis results show that the proposed prediction model can accurately predict the bubble detachment size under the condition of multi-hole nozzles.

关键词： bottom blowing bubble growth nozzle geometry non-spherical bubble

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The Acoustic Performance of 3D Printed Multiple Jet nozzles with DifferentConfigurations

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Sound & Vibration 2020年第1期54卷 43-55页

作者： Ali Safari Variani Ali Dastamoz Sajad Zare Ahmad Nikpey Saeid Ahmadi Department of Occupational Health and Safety School of Public HealthQazvin University of Medical SciencesQazvinIran Department of Occupational Health and Safety School of Public HealthKerman University of Medical SciencesKermanIran

This work investigated multiple jet nozzles with various geometrical shape,number of exits,and material on reducing noise radiated from jet *** are categorized in two groups with few and many exit numbers,each with various exit shapes,slot and circular,and ***,nozzles are designed and then fabricated by a 3D printer,Form Labs,Form2USA,with polymeric ***,the nozzle with the most noise reduction made of stainless *** and air thrust were measured at three air pressure gauges,3,5,7 BAR and directions from nozzle apex,30°,90°,135°.nozzles with slot exit shape made of both plastic and stainless steel revealed the most noise reduction among all nozzles with few exit numbers,nearly 11–14 dB(A)and 11.5–15 dB(A),*** average,slotted nozzle noise reduction was nearly 5–6 dB(A)more than finned ***,nozzles with more exit numbers,finned and finned-central exit,illustrated much more noise reduction than nozzles with few exit numbers,by almost 16–18 dB(A),they represented similar *** tested nozzles and open pipe demonstrated equal air thrust at each pressure *** nozzles with slotted exit shape,either plastic or stainless steel,can provide reasonable noise reduction in comparison to other configuration with few exit *** contrast,nozzles with more exit numbers demonstrated the most noise reduction.

关键词： Jet noise multiple jet nozzle noise reduction 3D design exit shape nozzle geometry

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