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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 8    August 2019

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Effect of nozzle geometry on pressure drop in submerged gas injection
XIAO Jun-bing(肖俊兵)1, 2, YAN Hong-jie(闫红杰)1, Markus SCHUBERT2, Sebastian UNGER2, LIU Liu(刘柳)1, Eckhard SCHLEICHER2, Uwe HAMPEL2, 3

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany;
3. Chair of Imaging Techniques in Energy and Process Engineering, Technische Universit?t
Dresden 01062, Germany

Abstract: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.

 

Key words: submerged gas injection; nozzle geometry; hydraulic diameter; pressure drop; modified Euler number

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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