Preliminarily experimental research on local pressure loss of fresh concrete during pumping

Measurement ◽  
2019 ◽  
Vol 147 ◽  
pp. 106897
Author(s):  
Jian Chen ◽  
Haibo Xie ◽  
Jie Guo ◽  
Bin Chen ◽  
Feng Liu
Keyword(s):  
Experimental Research ◽  
Pressure Loss ◽  
Fresh Concrete ◽  
Local Pressure

Optimization of fresh concrete pumping pressure loss with CFD-DEM approach

2021 ◽  
Vol 276 ◽  
pp. 122204
Author(s):  
Shengqiang Jiang ◽  
Xiaodong Chen ◽  
Guodong Cao ◽  
Yuanqiang Tan ◽  
Xiangwu Xiao ◽  
...  
Keyword(s):  
Pressure Loss ◽  
Fresh Concrete ◽  
Concrete Pumping

The Effects Produced by a Butterfly Valve in a Hydraulic Closed Circuit

2015 ◽  
Vol 811 ◽  
pp. 117-121
Author(s):  
Lucian Mândrea ◽  
Corina Cipu ◽  
Corina Băbuţanu ◽  
Gabriela Oprina
Keyword(s):  
Flow Rate ◽  
Pressure Loss ◽  
Volumetric Flow Rate ◽  
Water Velocity ◽  
Flow Coefficient ◽  
Closed Circuit ◽  
Butterfly Valve ◽  
Local Pressure ◽  
Pressure Transducers ◽  
Average Water

The paper presents the operation of a hydraulic closed circuit equipped with a butterfly valve which can close with a step of 10o. Using four pressure transducers and one temperature transducer, the authors determined the volumetric flow rate, the average water velocity and the local pressure loss in the butterfly valve, the flow coefficient Kv and also the incipient cavitation coefficient. Recommendations for the disposal of the butterfly valve are made and conclusions are obtained regarding the range of opening degrees in which the butterfly valve is better to be used.

Modeling of Hydraulic Line of Device Producing Fluctuant Load Based on Fluid Mechanics

2012 ◽  
Vol 252 ◽  
pp. 56-59
Author(s):  
Xian Bin Wang ◽  
Hong Xing Deng
Keyword(s):  
Fluid Mechanics ◽  
Pressure Loss ◽  
Hydraulic Pressure ◽  
Local Pressure ◽  
Line Model ◽  
Bench Tests ◽  
Friction Pressure ◽  
Experimental Bench ◽  
Pressure Characteristics

The paper deals with modeling of vehicle breaking system hydraulic line based on fluid mechanics. Under the consideration of friction pressure loss and local pressure loss in hydraulic line, an improved hydraulic line model is proposed. The experimental bench tests were carried out based on the device producing fluctuant load to verify the accuracy of the improved hydraulic line model. The system hydraulic pressure characteristics were analyzed by simulation using AMESim software.

CFD Application on Ventilation System of Hydro-Generator

2011 ◽  
Vol 383-390 ◽  
pp. 3561-3565
Author(s):  
Qun Feng Zhang ◽  
Jin Li Yan ◽  
Min Wang ◽  
Zhi Xiang Chen
Keyword(s):  
Pressure Loss ◽  
Rational Design ◽  
Ventilation System ◽  
Local Pressure ◽  
Porous Media Model ◽  
Air Cooler ◽  
Frame Method ◽  
Flow Flux ◽  
Icem Cfd ◽  
Different Parts

Averaged 3D N-S equations and RNG k-ε equations were solved with parallel computing CFD code on the flow field of dual radial ventilation system without fan for a hydro-generator. The MRF(multiple implicit rotating frame) method was used to simulated the rotating motion of the generator and porous media model were used to simulate the pressure loss of air cooler. Rational tactics were selected to generate calculation grids to compromise with calculation CPU time and result accuracy and the grids of different parts were generated with ICEM-CFD. The flow characteristic of different parts was analyzed and flow flux of different section was obtained. The research indicated that the flow from leakage gap between poles and stators formed "air wall", which generated a recirculation zone and made the bar cooling bad. The local pressure loss of stator entrance is dominant. There are leeward and windward areas for the air flowing with circumferential velocity component. Rational design of stator ducts entrance with some diversion effect, can reduce the pressure loss of the stator ventilation and improve the cooling of leeward area in stator ducts.

Experimental Research of Sulfate Corrosion Resistance of Fresh Concrete with Fly Ash

2013 ◽  
Vol 772 ◽  
pp. 109-116 ◽  
Author(s):  
Qing You Dong ◽  
Yin Hua Zhang ◽  
Li Ping Feng ◽  
De Bao Jin ◽  
Jing Shu Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Fly Ash ◽  
Experimental Research ◽  
Fresh Concrete

On the Pressure Losses Due to the Tip Clearance of Centrifugal Blowers

1981 ◽  
Vol 103 (2) ◽  
pp. 271-278 ◽  
Author(s):  
M. Ishida ◽  
Y. Senoo
Keyword(s):  
Pressure Gradient ◽  
Pressure Loss ◽  
Relative Velocity ◽  
Pressure Rise ◽  
Input Power ◽  
Tip Clearance ◽  
Centrifugal Impeller ◽  
Clearance Ratio ◽  
Local Pressure ◽  
Pressure Losses

The pressure distribution along the shroud is measured for three types of centrifugal impeller at seven different values of tip clearance each. The change of input power due to a change of tip clearance is related to the effective blockage at the impeller tip. Since the change of input power is little for the test cases, the variation of local pressure gradient along the shroud is mostly attributed to the change of local pressure loss. The local pressure loss is related to the local tip clearance ratio and to the local pressure gradient based on the deceleration of relative velocity in the impeller. Since the local pressure gradient is largest near the throat of the impeller, for many impellers the clearance ratio at the throat is used as the representative value. The tip clearance loss is related to the clearance ratio and the pressure rise based on the deceleration of relative velocity in the impeller. A good correlation is observed in all cases at various flow rate.

Research and Optimization on the Venturi Tube Dynamic Throttling Element of New Flowmeter

2012 ◽  
Vol 229-231 ◽  
pp. 1218-1221
Author(s):  
Jian Mei Ding ◽  
Xiang Bing Zhang ◽  
Lu Ding Kou
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Pressure Loss ◽  
Venturi Tube ◽  
Structure Parameters ◽  
Working Process ◽  
Local Pressure ◽  
Prototype Test ◽  
Fluent Software ◽  
Test Result

According to the working process of dynamic throttling element flowmeter, the Reynolds number keeps constant when the flow is steady. The way to change the pressure drop is to change the local pressure loss. Based on the Fluent software, analyze how the structure parameters of venturi tube affect pressure drop. With the completion of flowmeter prototype, test the dynamic throttling element by using a kind of binary flow calibration platform. According to the test result, figure out that the optimization can perfectly meet the real flowing condition.

Sign in / Sign up

Export Citation Format

Share Document