scholarly journals Compressibility Correction Effects of Two-equation Turbulence Models for a Supersonic Through-type Pintle Nozzle with Large Scale Separation Flow

2013 ◽  
Vol 17 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Junyoung Heo ◽  
Junyoung Jung ◽  
Hong-Gye Sung ◽  
June-Seo Yang ◽  
Ji-Hyung Lee
Keyword(s):  
Large Scale ◽  
Turbulence Models ◽  
Separation Flow ◽  
Scale Separation

Large-scale separation flow control on airfoil with synthetic jet

2018 ◽  
Vol 32 (2-3) ◽  
pp. 104-120 ◽  
Author(s):  
Z. L. Tang ◽  
J. D. Sheng ◽  
G. D. Zhang ◽  
J. Periaux
Keyword(s):  
Flow Control ◽  
Large Scale ◽  
Synthetic Jet ◽  
Separation Flow ◽  
Scale Separation

Motion of Swirling Vortex Generated From Sharp Edge

2007 ◽  
Author(s):  
H. Shigefuji ◽  
F. Shimizu ◽  
K. Tanaka ◽  
K. Tokuda
Keyword(s):  
Flow Field ◽  
Large Scale ◽  
Power Source ◽  
Transportation System ◽  
Sharp Edge ◽  
Separation Flow ◽  
Scale Separation ◽  
Natural Energy ◽  
Piv Measurement ◽  
Swirling Vortex

The siphon phenomenon is widely used for the transportation system of water and it is very economical and ecological because the natural energy of water is only used for the power source of the transportation system. The siphon phenomenon is continued while the water is supplied with from the entrance, and a large-scale separation flow forms near the entrance of a siphon tube. The appearance, the growth, the movement and the disappearance of a swirling vortex are observed inside the siphon tube, and the flow field near the entrance becomes very complex. In the present paper, the flow pattern behind a sharp edge of the entrance was investigated experimentally using the PIV measurement.

scholarly journals Assessment of Numerical Methods for Plunging Breaking Wave Predictions

2021 ◽  
Vol 9 (3) ◽  
pp. 264
Author(s):  
Shanti Bhushan ◽  
Oumnia El Fajri ◽  
Graham Hubbard ◽  
Bradley Chambers ◽  
Christopher Kees
Keyword(s):  
Solitary Wave ◽  
Wave Breaking ◽  
Large Scale ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Wave Crest ◽  
Breaking Wave ◽  
Rans Turbulence Models ◽  
Run Up ◽  
Better Than

This study evaluates the capability of Navier–Stokes solvers in predicting forward and backward plunging breaking, including assessment of the effect of grid resolution, turbulence model, and VoF, CLSVoF interface models on predictions. For this purpose, 2D simulations are performed for four test cases: dam break, solitary wave run up on a slope, flow over a submerged bump, and solitary wave over a submerged rectangular obstacle. Plunging wave breaking involves high wave crest, plunger formation, and splash up, followed by second plunger, and chaotic water motions. Coarser grids reasonably predict the wave breaking features, but finer grids are required for accurate prediction of the splash up events. However, instabilities are triggered at the air–water interface (primarily for the air flow) on very fine grids, which induces surface peel-off or kinks and roll-up of the plunger tips. Reynolds averaged Navier–Stokes (RANS) turbulence models result in high eddy-viscosity in the air–water region which decays the fluid momentum and adversely affects the predictions. Both VoF and CLSVoF methods predict the large-scale plunging breaking characteristics well; however, they vary in the prediction of the finer details. The CLSVoF solver predicts the splash-up event and secondary plunger better than the VoF solver; however, the latter predicts the plunger shape better than the former for the solitary wave run-up on a slope case.

Large-scale separation of alkaloids from Corydalis decumbens by pH-zone-refining counter-current chromatography

2006 ◽  
Vol 1115 (1-2) ◽  
pp. 267-270 ◽  
Author(s):  
Xiao Wang ◽  
Yanling Geng ◽  
Fuwei Li ◽  
Xingang Shi ◽  
Jianhua Liu
Keyword(s):  
Large Scale ◽  
Zone Refining ◽  
Scale Separation ◽  
Counter Current

SPECIAL REVIEWS

PEDIATRICS ◽  
1948 ◽  
Vol 2 (4) ◽  
pp. 489-497
Author(s):  
CHARLES A. JANEWAY
Keyword(s):  
Plasma Proteins ◽  
Chemical Structure ◽  
Large Scale ◽  
Blood Donors ◽  
Red Cross ◽  
American Red Cross ◽  
Scale Separation ◽  
Medical Progress ◽  
Scientific Curiosity ◽  
Free People

This brief review of some of the recent accessions to our knowledge of the chemical structure, physiologic functions, and therapeutic applications of the plasma proteins serves to emphasize three important elements in medical progress—scientific curiosity, the humanitarian impulse, and effective social organization. We have had the privilege of summarizing the work of hundreds of investigators, whose studies are giving us new tools for the investigation and treatment of disease. Their work has only been possible because the magnificent response of a free people to the call for blood donors by a voluntary philanthropic agency, the American Red Cross, was coupled with a technical triumph, the development of practical methods for the large-scale separation of the plasma proteins, itself the culmination of highly theoretical and seemingly impractical investigations by protein chemists in various countries for many years.

scholarly journals Separation and Purification of Two Flavone Glucuronides fromErigeron multiradiatus(Lindl.) Benth with Macroporous Resins

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-feng Zhang ◽  
Yuan Liu ◽  
Pei Luo ◽  
Hao Zhang
Keyword(s):  
Large Scale ◽  
Raw Materials ◽  
Sorption Isotherms ◽  
Preparative Separation ◽  
Separation And Purification ◽  
Bioactive Constituents ◽  
Simple Method ◽  
Scale Separation ◽  
Adsorption And Desorption ◽  
Macroporous Resins

Scutellarein-7-O-β-D-glucuronide (SG) and apigenin-7-O-β-D-glucuronide (AG) are two major bioactive constituents with known pharmacological effects inErigeron multiradiatus. In this study, a simple method for preparative separation of the two flavone glucuronides was established with macroporous resins. The performance and adsorption characteristics of eight macroporous resins including AB-8, HPD100, HPD450, HPD600, D100, D101, D141, and D160 have been evaluated. The results confirmed that D141 resin offered the best adsorption and desorption capacities and the highest desorption ratio for the two glucuronides among the tested resins. Sorption isotherms were constructed for D141 resin under optimal ethanol conditions and fitted well to the Freundlich and Langmuir models (R2>0.95). Dynamic adsorption and desorption tests was performed on column packed with D141 resin. After one-run treatment with D141 resin, the two-constituent content in the final product was increased from 2.14% and 1.34 % in the crude extract ofErigeron multiradiatusto 24.63% and 18.42% in the final products with the recoveries of 82.5% and 85.4%, respectively. The preparative separation of SG and AG can be easily and effectively achieved via adsorption and desorption on D141 resin, and the method developed can be referenced for large-scale separation and purification of flavone glucuronides from herbal raw materials.

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