Results 111 to 120 of about 28,738 (129)

Investigation of Head Loss along Drip Emitter Channel by Using Computational Fluid Dynamics

7th World Congress on Computers in Agriculture Conference Proceedings, 22-24 June 2009, Reno, Nevada, 2009
It is difficult to investigate how to achieve biggest head loss of the drip emitter channel due to the channel’s minor and complicated structure. Four types of Super Typhoon emitter with trapezoidal channel were selected out for the investigation of the head loss along the channel, and the CFD (Computational Fluid Dynamics) method was applied to ...
null Lu Gang, null Wei Qingsong, null Liu Jie, null Shi Yusheng, null Dong Wenchu   +4 more
openaire   +3 more sources

An improved finite element model for the hydraulic analysis of drip irrigation subunits considering local emitter head loss

Irrigation Science, 2019
A good hydraulic design of drip irrigation systems requires an accurate evaluation of the friction head loss that occurs in pipes as well as the local head loss induced by the presence of emitters. Previous approaches on theoretical design usually neglect the local emitter head loss or consider it equal to the friction loss produced by an equivalent ...
Jian Wang, Rui Chen
openaire   +3 more sources

Simulation of Local Head Loss in Trickle Lateral Lines Equipped with In‐line Emitters Based on Dimensional Analysis

Irrigation and Drainage, 2018
Abstractin order to investigate local head loss in trickle lateral lines equipped with integrated in‐line emitters, experiments were conducted on four common drip irrigation pipes of varying size, and CFD software was used to simulate and verify the results. Simulations of total head loss agreed well with the experimental data.
Yalin Wang, Delan Zhu, Lin Zhang, Shijiang Zhu   +3 more
openaire   +3 more sources

Influence of the Inclination Angle of the Side Wall of Drip Emitters on Local Head Loss in Drip Irrigation Tubes

Irrigation and Drainage
ABSTRACT To study the influence of the end face inclination angle of an emitter on local head loss in a drip irrigation pipe, the end face of an in‐line emitter was designed with various inclination angles; four levels—15°, 30°, 45°, and 90°—were set; and irrigation experiments and numerical simulations were carried out.
Ya‐lin Wang, Yu‐xin Wu, Dong Xia, Zhong‐yong Yang, Shi‐jiang Zhu, Xin‐jian Liu   +5 more
openaire   +3 more sources

Experimental determination of local head loss of non-coaxial emitters in thin-wall lay-flat polyethylene pipes

Biosystems Engineering, 2020
The hydraulic performance of thin-wall lay-flat polyethylene pipes with non-coaxial emitters were evaluated in this study. Two experiments were performed to measure the dimensional variation of commercially available lay-flat drip irrigation pipes. A model for estimating the corresponding local head loss was developed and validated using dimensional ...
Jian Wang, Ting Yang, Tao Wei, Rui Chen, Shouqi Yuan   +4 more
openaire   +1 more source

Local Head Loss of Non-Coaxial Emitters Inserted in Polyethylene Pipe

Transactions of the ASABE, 2009
The design of a lateral line for drip irrigation requires accurate evaluation of head losses in not only the pipe but in the emitters as well. A procedure was developed to determine localized head losses within the emitters by the formulation of a mathematical model that accounts for the obstruction caused by the insertion point. These localized losses
null O. Rettore Neto, null J. H. de Miranda, null J. A. Frizzone, null S. R. Workman   +3 more
openaire   +1 more source

Estimating Local Head Loss of Non Coaxial Emitters

2009 Reno, Nevada, June 21 - June 24, 2009, 2009
The design procedure of a lateral line of trickle irrigation needs to be evaluated accurately, by accounting for head losses distributed in the piping as well as within the emitters. A methodology was developed for determining localized head losses by the formulation of a mathematical model using the concept of an obstruction index.
null Osvaldo Rettore Neto, null Jarbas Honorio Miranda, null Jose Antonio Frizzone, null Stephen R Workman   +3 more
openaire   +1 more source

Specific Emitter Identification via Contrastive Learning

IEEE Communications Letters, 2023
Zitao Wu, Fanggang Wang, Boxiang He
exaly  

Design, realization and loss analysis of efficient low-cost large-area bifacial interdigitated-back-contact solar cells with front floating emitter

Solar Energy Materials and Solar Cells, 2022
Jikui Ma, Radovan Kopeček, Jianhui Chen   +2 more
exaly  

A Specific Emitter Identification Approach Based on Multi-Head Attention Mechanism

2023
Wensheng Zhang, Mingyan Jiang
exaly