Abstract
Vigorously developing efficient water-saving agricultural technologies using the Yellow River Water is an important way to achieve sustainable use of water resources. In order to clarify the fluid movement characteristics inside the flow path of the emitter under complicated water quality conditions in a drip irrigation system using the Yellow River Water, the optimal simulation turbulence model for the flow field in the flow path of the emitter was determined by comparing the macroscopic hydraulic characteristics with the microscopic fluid motion characteristics of the fluid in the emitter. On this basis, the two-phase flow model was used to calculate and analyze the characteristics of water flow movement and particle transport in the emitter. The results show that the RNG (Re- normalization group) k-ε turbulence model was the most suitable for the simulation of the flow field in the emitter, considering the macroscopic hydraulic performance and microscopic anti-clogging ability of the emitter synthetically, and both the comprehensive calculation accuracy and the calculation efficiency. The pressure showed a step-like uniform decrease along the direction of water flow. The fluid flow showed the regional movement characteristics of the mainstream and non-mainstream regions. The energy dissipation mainly occurred at the sudden change sites of the flow path structure. The particle phase velocity was slightly lower than that of the water phase. The velocity at the near-wall surface was relatively lower than that at the center, and the velocity distribution along the depth direction of the flow path was relatively uneven. The sediment was mainly deposited in the first half of the flow path. This study can provide a theoretical basis for solving the emitter clogging in the drip irrigation systems applying water from the Yellow River.
Highlights
Water is the basic material condition related to the survival and social development of mankind, is a limited and irreplaceable valuable resource, and is an important guarantee to realize the sustainable development of economy and society
The flow change law with pressure and the velocity distribution inside the emitter are shown in Figures 2 and 3 measured by DPIV and simulated by the standard k-ε model, RNG k-ε model, and LES model
In this paper, the RNG k-ε turbulence model was determined as the optimal simulation turbulence model of the flow field in the emitter flow path by comparing the macroscopic hydraulics and microfluid motion characteristics
Summary
Water is the basic material condition related to the survival and social development of mankind, is a limited and irreplaceable valuable resource, and is an important guarantee to realize the sustainable development of economy and society. While the world’s economy has rapidly grown and great achievements have been made in various fields of construction, great resource and environmental costs have been paid. Water pollution is one such cost, which makes the already severe shortage of freshwater resources more insufficient. Combined with the unreasonable use of water, the world is facing a water crisis. These water problems are threatening the survival and development of mankind. Only by insisting on sustainable development and saving water resources can we make the economy develop well and quickly. Since the 18th National Congress of the Communist Party of China, General Secretary Xi Jinping has conducted on-site inspections of various tasks in the Yellow River
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