scholarly journals Simulation and Verification of Hydraulic Performance and Energy Dissipation Mechanism of Perforated Drip Irrigation Emitters

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 171
Author(s):  
Shaobo Xing ◽  
Zhenhua Wang ◽  
Jinzhu Zhang ◽  
Ningning Liu ◽  
Bo Zhou
Keyword(s):  
Energy Dissipation ◽  
Drip Irrigation ◽  
Hydraulic Performance ◽  
Channel Structure ◽  
Flow Index ◽  
Flow Ratio ◽  
Energy Dissipation Mechanism ◽  
Mechanism Research ◽  
Dissipation Mechanism ◽  
High Pressure Zone

Drip irrigation has become an application trend of water-saving irrigation technology due to its excellent water-use efficiency. However, the energy dissipation form of the commonly used labyrinth channel is relatively simple, and the corresponding energy dissipation mechanism research is inadequate. This article proposes a new kind of channel structure of drip irrigation emitters based on the structure of scalariform perforation plates in plant xylem vessels. We establish a total of 16 sets of orthogonal structure schemes. Using numerical simulation and physical experiments, the hydraulic performance and energy dissipation mechanism of the perforated drip irrigation emitters (PDIE) are studied. The results show that the flow index of PDIE is 0.4665–0.5266. The hydraulic performance of PDIE in the high-pressure zone is the best, and the flow index is 0.4665–0.5046. As the pressure increases, the velocity of the flow of the upper perforation increases rapidly, the flow ratio decreases, the flow index decreases, and the hydraulic performance improves. To further verify the energy dissipation mechanism, a lower flow ratio and a better hydraulic performance were obtained through appropriately expanding the upper part of the upper perforation inlet to the channel boundary. The research sheds new insights for optimizing the hydraulic performance of PDIE. Results reported here provide a theoretical basis for the structural design of drip irrigation emitters and the energy dissipation mechanism research.

Numerical Calculation of Triangle Circulation Drip Irrigation Emitters

2010 ◽  
Author(s):  
Xinkun Wang ◽  
Junhong Li
Keyword(s):  
Flow Rate ◽  
Drip Irrigation ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Structure Design ◽  
Flow Channel ◽  
Channel Structure ◽  
Sudden Expansion ◽  
Flow Index ◽  
Circulation Flow

Based on the hydraulic characteristics of triangle circulation, sudden-expansion pipe and sudden contraction pipe, Construct a drip irrigation emitter with strong turbulent flow, large over-current cross-section and strong anti-clogging ability. Triangular circulation flow path emitters for the key structural parameters for the factors, application of computer numerical fluid dynamics CFD software FLUENT6.3, simulate triangular circulation flow channel structure, analyze the influence of various structural parameters on hydraulic performance of emitters, flow index, flow rate and the anti-clogging ability. The results show that increase unit cusp, unit chamfer, the flow index increased, but the effect to varying degrees; inlet dimension increase, flow index reduced; flow channel depth and flow channel width increases, the discharge increases. Increase unit cusp, unit chamfered, can improve the anti-clogging performance of emitters. Based on the above results, to design an emitter structure with good performance, and its numerical simulation analysis, the flow index, flow rate and anti-clogging ability have met the requirements of drip irrigation. Provide a theoretical basis for the triangle circulation emitter structure design and quantitative analysis. The research has a positive meaning for energy conservation.

scholarly journals Interfacial strength-controlled energy dissipation mechanism and optimization in impact-resistant nacreous structure

2019 ◽  
Vol 163 ◽  
pp. 107532 ◽  
Author(s):  
Kaijin Wu ◽  
Zhijun Zheng ◽  
Shuaishuai Zhang ◽  
Linghui He ◽  
Hongbin Yao ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Interfacial Strength ◽  
Energy Dissipation Mechanism ◽  
Dissipation Mechanism

scholarly journals Energy dissipative photoprotective mechanism of carotenoid spheroidene from the photoreaction center of purple bacteria Rhodobacter sphaeroides

2015 ◽  
Vol 17 (36) ◽  
pp. 23468-23480 ◽  
Author(s):  
Sundaram Arulmozhiraja ◽  
Naoki Nakatani ◽  
Akira Nakayama ◽  
Jun-ya Hasegawa
Keyword(s):  
Energy Dissipation ◽  
Rhodobacter Sphaeroides ◽  
Purple Bacteria ◽  
Minimum Energy ◽  
Intersystem Crossing ◽  
Triplet Energy ◽  
Energy Dissipation Mechanism ◽  
Dissipation Mechanism ◽  
Crossing Point

Triplet energy dissipation mechanism of a carotenoid: just bond twisting and stretching lead to minimum energy intersystem crossing point.

scholarly journals Numerical investigation of the turbulence characteristics and energy dissipation mechanism of baffle drop shafts

2021 ◽  
Author(s):  
Qinghua Yang ◽  
Qian Yang
Keyword(s):  
Energy Dissipation ◽  
Flow Rate ◽  
High Energy ◽  
Design Flow ◽  
Low Flow ◽  
Turbulence Characteristics ◽  
Energy Dissipation Mechanism ◽  
Dissipation Mechanism ◽  
Drop Flow ◽  
Free Drop

Abstract The baffle drop shaft is widely used in deep tunnel drainage system due to its fine applicability and high energy dissipation. To fully study the turbulence characteristics and energy dissipation mechanism of baffle drop shafts, a 1:25 scale physical model test and the numerical simulation based on the Realizable k-ε model and Volume of Fluid (VOF) method were performed. The results showed that a baffle spacing that is too dense or too sparse is not conducive to energy dissipation and discharge. The minimum baffle spacing is the optimal structural design at the design flow rate when the flow regime is free-drop flow. The energy dissipation calculation model established in this paper has high accuracy for calculating the energy dissipation rate on the baffles in free-drop flow. The energy dissipation modes of the shaft can be divided into inlet energy dissipation, baffle energy dissipation, and shaft-bottom energy dissipation. Baffles play a major role in the energy dissipation at low flow rates, and the proportions of inlet and shaft-bottom energy dissipation increase with the increase in flow rate.

Oxide layer delamination: an energy dissipation mechanism during high-velocity microparticle impacts

2021 ◽  
pp. 151673
Author(s):  
Ahmed A. Tiamiyu ◽  
Xi Chen ◽  
Edward L. Pangv ◽  
Yuchen Sun ◽  
Jasper Z. Lienhard ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Oxide Layer ◽  
High Velocity ◽  
Energy Dissipation Mechanism ◽  
Dissipation Mechanism
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