CFD and digital particle tracking to assess flow characteristics in the labyrinth flow path of a drip irrigation emitter

2008 ◽  
Vol 26 (5) ◽  
pp. 427-438 ◽  
Author(s):  
Yunkai Li ◽  
Peiling Yang ◽  
Tingwu Xu ◽  
Shumei Ren ◽  
Xiongcai Lin ◽  
...  
Keyword(s):  
Particle Tracking ◽  
Drip Irrigation ◽  
Flow Characteristics ◽  
Flow Path ◽  
Drip Irrigation Emitter

Effects of Parameters Variation of Fractal Flow Path on the Emitter Hydraulic Performance with Path Analysis

2013 ◽  
Vol 397-400 ◽  
pp. 222-229
Author(s):  
Peng Song ◽  
Pei Ling Yang ◽  
Fei Peng Xu ◽  
Chun Fa Zhou
Keyword(s):  
Path Analysis ◽  
Drip Irrigation ◽  
Hydraulic Performance ◽  
Flow Path ◽  
Flow Coefficient ◽  
Performance Parameters ◽  
Section Area ◽  
Tooth Number ◽  
Drip Irrigation Emitter ◽  
Main Factor

Flow path is one of the key components of drip irrigation emitter. Four factors of fractal flow path section area, length, tooth highness and tooth number are interosculated nearly each other, and the influencing process of flow path to hydraulic performance parameters was analyzed with path analysis. The section area and length of the flow path were the main factor affecting on the flow exponent and flow coefficient of drip irrigation emitter, and other ones less. Reducing the section area could debase the emitter flow exponent, and reducing section area and increasing the length of fractal flow path could debase the flow coefficient.

scholarly journals Simulation of the flow characteristics of a drip irrigation emitter with large eddy methods

2013 ◽  
Vol 58 (3-4) ◽  
pp. 497-506 ◽  
Author(s):  
Dan Wu ◽  
Yun-kai Li ◽  
Hai-sheng Liu ◽  
Pei-ling Yang ◽  
Hao-su Sun ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Flow Characteristics ◽  
Large Eddy ◽  
Drip Irrigation Emitter

scholarly journals Modeling the future of irrigation: A parametric description of pressure compensating drip irrigation emitter performance

PLoS ONE ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. e0175241 ◽  
Author(s):  
Pulkit Shamshery ◽  
Ruo-Qian Wang ◽  
Davis V. Tran ◽  
Amos G. Winter V
Keyword(s):  
Drip Irrigation ◽  
The Future ◽  
Parametric Description ◽  
Drip Irrigation Emitter

Flow Characteristics of a Novel Centrifugal Compressor Design

2016 ◽  
Author(s):  
Shashank Mishra ◽  
Shaaban Abdallah ◽  
Mark Turner
Keyword(s):  
Centrifugal Compressor ◽  
Pressure Ratio ◽  
Flow Characteristics ◽  
Axial Compressor ◽  
Low Pressure ◽  
Flow Path ◽  
Optimization Techniques ◽  
Single Stage ◽  
Multi Stage ◽  
Compressor Design

Multistage axial compressor has an advantage of lower stage loading as compared to a single stage. Several stages with low pressure ratio are linked together which allows for multiplication of pressure to generate high pressure ratio in an axial compressor. Since each stage has low pressure ratio they operate at a higher efficiency and the efficiency of multi-stage axial compressor as a whole is very high. Although, single stage centrifugal compressor has higher pressure ratio compared with an axial compressor but multistage centrifugal compressors are not as efficient because the flow has to be turned from radial at outlet to axial at inlet for each stage. The present study explores the advantages of extending the axial compressor efficient flow path that consist of rotor stator stages to the centrifugal compressor stage. In this invention, two rotating rows of blades are mounted on the same impeller disk, separated by a stator blade row attached to the casing. A certain amount of turning can be achieved through a single stage centrifugal compressor before flow starts separating, thus dividing it into multiple stages would be advantageous as it would allow for more flow turning. Also the individual stage now operate with low pressure ratio and high efficiency resulting into an overall increase in pressure ratio and efficiency. The baseline is derived from the NASA low speed centrifugal compressor design which is a 55 degree backward swept impeller. Flow characteristics of the novel multistage design are compared with a single stage centrifugal compressor. The flow path of the baseline and multi-stage compressor are created using 3DBGB tool and DAKOTA is used to optimize the performance of baseline as well novel design. The optimization techniques used are Genetic algorithm followed by Numerical Gradient method. The optimization resulted into improvements in incidence and geometry which significantly improved the performance over baseline compressor design. The multistage compressor is more efficient with a higher pressure ratio compared with the base line design for the same work input and initial conditions.

scholarly journals Low Cost Constant – Head Drip Irrigation Emitter for Climate Change Adaptation in Nigeria: Engineering Design and Calibration

2015 ◽  
Vol 34 (4) ◽  
pp. 898 ◽  
Author(s):  
A Sobowale ◽  
AM Omotayo ◽  
JO Olobashola ◽  
P Abdulsalaam-sagir ◽  
K Elemo ◽  
...  
Keyword(s):  
Climate Change ◽  
Engineering Design ◽  
Climate Change Adaptation ◽  
Drip Irrigation ◽  
Low Cost ◽  
Constant Head ◽  
Drip Irrigation Emitter

Experimental Study of Surrogate Particle Transport and Deposition in a Square Channel Using Particle Tracking Technique

2019 ◽  
Author(s):  
Daniel Orea ◽  
Thien Nguyen ◽  
Rodolfo Vaghetto ◽  
N. K. Anand ◽  
Yassin A. Hassan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Particle Tracking ◽  
Particle Transport ◽  
Particle Deposition ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Test Facility ◽  
Square Channel ◽  
Fluid Flow Characteristics

Abstract This paper presents an experimental study of hydrodynamics flow characteristics and particle transport in a test facility. Experimental measurements of fluid flow and particle deposition are studied under isothermal conditions using particle image velocimetry (PIV) and particle tracking velocimetry (PTV) techniques. These non-intrusive optical measurement techniques have been applied in experiment conditions of Reynolds number Re = 5,077 in a 3-inch square channel and 72-inches in total length. The fluid within the channel is air seeded with aerosol droplets while the measurements of particle transport is facilitated using surrogate particles dispersed in the channel flow. Results obtained from the PIV and PTV measurements included the hydrodynamics fluid flow characteristics, and characteristics of particle transports, such as particle velocity, particle diameter distributions and particle concentration profiles. Results from the preliminary test have shown 11.08% deposition of particles. To supplement this experimental work, upstream fluid flow characteristics were provided as boundary conditions for a comparable numerical study.

Effects of flow path boundary optimizations on particle transport in drip irrigation emitters

2016 ◽  
Vol 65 (4) ◽  
pp. 417-425 ◽  
Author(s):  
Sun Haosu ◽  
Li Yunkai ◽  
Feng Ji ◽  
Haisheng Liu ◽  
Yaoze Liu
Keyword(s):  
Drip Irrigation ◽  
Particle Transport ◽  
Flow Path
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