Numerical simulation of the flow field structure of liquid nitrogen jet

Cai, Chengzheng; Ren, Keda; Li, Qinghua

doi:10.2298/tsci180511131c

Cited by 5 publications

(2 citation statements)

References 11 publications

(14 reference statements)

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“…Xiao et al [19] established a single-nozzle model with different transverse velocities and studied the characteristics of jet flow fields and deflection. Cai et al [20] developed a two-dimensional computational fluid dynamics (CFDs) model to investigate the flow structure of a liquid nitrogen jet and conducted numerical simulations to analyze the transient velocity and temperature distribution of the jet. Their findings clearly demonstrate that the liquid nitrogen jet exhibits distinct regions, including a velocity boundary and potential core region, which are similar to those observed in water jets.…”

Section: Introductionmentioning

confidence: 99%

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Li,

Lu,

Zhao

et al. 2024

Processes

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The impact of particle addition jets on the flow field in natural gas pipelines was investigated, and the structural information of the flow field at different flow velocities in a symmetric jet flow was analyzed via numerical simulation. The results of coherent structures in the high-pressure natural gas pipeline reveal vortex structures of varying sizes both upstream and downstream of the jet flow. To determine the spatial distribution of the main vortex structures in the flow field, proper orthogonal decomposition (POD) mode analysis was performed on the unsteady numerical results. Moreover, the detailed spatial characteristics of the coherent vortex structures represented by each mode were obtained. The results indicate that the large-scale vortex structures within the pipeline are balanced and stable, with their energy increasing as the jet flow velocity increases. Additionally, higher-order modes exhibit significant shedding of small-scale vortex structures downstream of the jet flow. In this research, coherent structures present in symmetric particle addition jets are provided, offering theoretical support for future investigations on the distribution of particle image velocimetry (PIV) flowmeters.

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Section: Introductionmentioning

confidence: 99%

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Li,

Lu,

Zhao

et al. 2024

Processes

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“…Cai et al [21] evaluated the flow field structure of liquid nitrogen jet by establishing a two-dimensional CFD model. In order to evaluate the flow field structure of a liquid nitrogen jet, Cai Chengzheng et al established a two-dimensional CFD model [22].…”

Section: Introductionmentioning

confidence: 99%

Complex Flow Mechanism and Pressurization Effect of Liquid Nitrogen Jet Fracturing Formation Perforation Tunnel

Zou,

Cai,

Wang

et al. 2023

Processes

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As an anhydrous fracturing method, liquid nitrogen jet fracturing technology is expected to become an efficient development method for shale gas resources. In order to explore the influence of the pressurization effect in the liquid nitrogen jet channel, the flow field in the perforation tunnel during the liquid nitrogen jet fracturing process was simulated by computational fluid dynamics, and the complex flow mechanism of liquid nitrogen in the perforation tunnel was analyzed. The pressurization effect of liquid nitrogen jet and water jet fracturing was compared, and the influence of various parameters on the pressurization effect of liquid nitrogen jet fracturing was studied. The research results indicate that under the same conditions, liquid nitrogen jets have a pressurization effect comparable to water jets, and the difference between the pressurization values of the liquid nitrogen jet and the water jet in the perforation tunnel is not more than 0.4 MPa under different nozzle pressure drop conditions. The larger the nozzle pressure drop and nozzle diameter, the greater the pressure increase value in the perforation tunnel of liquid nitrogen jet fracturing, which decreases with the increase in casing hole diameter. Further analysis shows that the pressurization effect is most affected by the two parameters of casing hole diameter and nozzle diameter. The essential reason for its influence on the pressurization value is the squeezing effect of the jet on the perforation tunnel fluid and the sealing effect of the shrinking part of the perforation tunnel on the backflow. The ambient pressure, the temperature of liquid nitrogen, and the diameter of the wellbore have no obvious effect on the pressurization effect. Therefore, through the reasonable combination of casing hole diameter and nozzle diameter, the sealing effect of the contraction part of the perforation tunnel on the fluid and the squeezing effect on the fluid in the perforation tunnel will be affected, which will significantly improve the pressurization effect of the liquid nitrogen jet in the perforation tunnel.

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Experimental Investigation of the Damage Characteristics of High-Temperature Granite Subjected to Liquid Nitrogen Treatment

et al. 2022

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Numerical simulation of the flow field structure of liquid nitrogen jet

Cited by 5 publications

References 11 publications

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Complex Flow Mechanism and Pressurization Effect of Liquid Nitrogen Jet Fracturing Formation Perforation Tunnel

Experimental Investigation of the Damage Characteristics of High-Temperature Granite Subjected to Liquid Nitrogen Treatment

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