Resonance Response of Reverse Flow Reactors: A Numerical Simulation

2015 ◽  
Vol 54 (22) ◽  
pp. 5885-5893 ◽  
Author(s):  
Yingying Zhu ◽  
Geng Chen ◽  
Xinbao Li ◽  
Guohua Yang
Keyword(s):  
Numerical Simulation ◽  
Reverse Flow ◽  
Flow Reactors ◽  
Resonance Response

Energy recovery from ventilation air methane via reverse-flow reactors

Energy ◽  
2015 ◽  
Vol 92 ◽  
pp. 13-23 ◽  
Author(s):  
Krzysztof Gosiewski ◽  
Anna Pawlaczyk ◽  
Manfred Jaschik
Keyword(s):  
Energy Recovery ◽  
Reverse Flow ◽  
Flow Reactors

Aerodynamic Behavior of Asymmetric Jets in 3-D Furnaces

1994 ◽  
Author(s):  
F. M. El-Mahallawy ◽  
M. A. Hassan ◽  
M. A. Ismail ◽  
H. Zafan
Keyword(s):  
Numerical Simulation ◽  
Flow Pattern ◽  
Numerical Experiments ◽  
Recirculation Zone ◽  
Reverse Flow ◽  
Three Dimensional ◽  
Flow Region ◽  
Stabilization Method ◽  
Flow Features

The purpose of this paper is to present and evaluate numerical experiments illustrating the flow features in a 3-D furnace utilizing unconventional asymmetrical jet that creates natural recirculation zone. The numerical simulation of this aerodynamic stabilization method have unveiled the three-dimensional nature of the flow pattern which possesses a quite large reverse flow region. The size and strength of the built recirculation zone would be capable of stabilizing the burning of low-quality fuels.

Numerical simulation of the stalled flow within a vaned centrifugal pump

2004 ◽  
Vol 218 (4) ◽  
pp. 425-435 ◽  
Author(s):  
K M Guleren ◽  
A Pinarbasi
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
High Speed ◽  
Stokes Equations ◽  
Reverse Flow ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Leakage Flow ◽  
Navier Stokes Equations ◽  
Low Pass

The main goal of the present work is to analyse the numerical simulation of a centrifugal pump by solving Navier-Stokes equations, coupled with the ‘standard k-∊’ turbulence model. The pump consists of an impeller having five curved blades with nine diffuser vanes. The shaft rotates at 890r/min. Flow characteristics are assumed to be stalled in the appropriate region of flowrate levels of 1.31-2.861/s. Numerical analysis techniques are performed on a commercial FLUENT package program assuming steady, incompressible flow conditions with decreasing flowrate. Under stall conditions the flow in the diffuser passage alternates between outward jetting when the low-pass-filtered pressure is high to a reverse flow when the filtered pressure is low. Being below design conditions, there is a consistent high-speed leakage flow in the gap between the impeller and the diffuser from the exit side of the diffuser to the beginning of the volute. Separation of this leakage flow from the diffuser vane causes the onset of stall. As the flowrate decreases both the magnitude of the leakage within the vaneless part of the pump and reverse flow within a stalled diffuser passage increase. As this occurs, the stall-cell size extends from one to two diffuser passages. Comparisons are made with experimental data and show good agreement.

The application of reverse flow reactors to endothermic reactions

1992 ◽  
Vol 47 (9-11) ◽  
pp. 2927-2932 ◽  
Author(s):  
Thomas N. Haynes ◽  
Christos Georgakis ◽  
Hugo S. Caram
Keyword(s):  
Reverse Flow ◽  
Flow Reactors ◽  
Endothermic Reactions

scholarly journals Two-dimensional Numerical Simulation of Continuous Reverse-flow Oxidation of Ultralow Heating Value Coalbed Methane

2018 ◽  
Vol 144 ◽  
pp. 33-42 ◽  
Author(s):  
Peng-fei Wang ◽  
Yong-jun Li ◽  
Rong-hua Liu ◽  
Xuan-hao Tan ◽  
Chang Tian ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coalbed Methane ◽  
Reverse Flow ◽  
Two Dimensional ◽  
Heating Value

scholarly journals Novel procedure for the numerical simulation of solar water disinfection processes in flow reactors

2019 ◽  
Vol 376 ◽  
pp. 120194 ◽  
Author(s):  
Ángela García-Gil ◽  
Cintia Casado ◽  
Cristina Pablos ◽  
Javier Marugán
Keyword(s):  
Numerical Simulation ◽  
Water Disinfection ◽  
Flow Reactors ◽  
Solar Water ◽  
Solar Water Disinfection

scholarly journals Numerical investigations on effect of wear-ring clearance on performance of a submersible well pump

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401770415 ◽  
Author(s):  
Weidong Shi ◽  
Xiongfa Gao ◽  
Qihua Zhang ◽  
Desheng Zhang ◽  
Daoxing Ye
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Reverse Flow ◽  
Internal Flow ◽  
Experimental Results ◽  
Ring Size ◽  
Numerical Investigations ◽  
Calculation Results

A typical submersible well pump was investigated in this article. The whole flow field of submersible well pump was numerically simulated by computational fluid dynamics software. The influence of clearance of wear-rings on the external characteristic and internal flow field was analyzed through comparing the calculation results with experimental results. The result of the numerical simulation shows that changing clearance of front wear-ring has a greater impact on pump performances than changing clearance of back wear-ring, and the head and efficiency of pump decrease with the increase in the size of clearance. Especially when the size of clearance is larger than 0.5 mm, decreasing becomes more obvious. When the front and back wear-ring size of the clearance comes to 1.0 mm, the efficiency decreases from the highest point of 75.31% to 65.44% at rated flow, and the head of pump decreases about 3.5 m. When the size of clearance is 0.2 mm, reverse-flow will appear in the front shroud cavity of the impeller, and leakage from back wear-ring through the balance hole into the impeller, which has a little influence on the flow field of the impeller inlet.

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