Numerical study on the influence of supersonic nozzle structure on the swirling condensation characteristics of CO2

Chen, Jianan; Jiang, Wenming; Han, Chenyu; Liu, Yang

doi:10.1016/j.jngse.2020.103753

Cited by 22 publications

(3 citation statements)

References 37 publications

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“…There are currently many types of shrinkage design curves, the most common types of curves being a double parametric curve and its modifications, a Witoszynski curve and its modifications, and a straight line. The best parameters of speed and stability have been shown by the double parametric curve and the Witoszynski curve [23,24].…”

Section: Convergent Sectionmentioning

confidence: 99%

Numerical Study of Powder Flow Nozzle for Laser-Assisted Metal Deposition

et al. 2021

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Metal additive manufacturing has received much attention in the past few decades, and it offers a variety of technologies for three-dimensional object production. One of such technologies, allowing large-sized object production, is laser-assisted metal deposition, the limits of which are determined by the capabilities of the positioning system. The already-existing nozzles have either a relatively low build rate or a poor resolution. The goal of this work is to develop a new nozzle with a centered particle beam at high velocity for the laser-assisted metal additive manufacturing technologies. Scientific challenges are addressed with regards to the fluid dynamics, the particle-substrate contact, and tracking of the thermodynamic state during contact. In this paper, two nozzles based on the de Laval geometry with Witoszynski and Bicubic curves of convergence zone were designed; the results showed that the average flow velocity in a Bicubic outlet curve nozzle is around 615 m/s and in Witoszynski this is 435 m/s. Investigation of particle beam formation for the Bicubic curve geometry revealed that small particles have the highest velocity and the lowest total force at the nozzle outlet. Fine particles have a shorter response time, and therefore, a smaller dispersion area. The elasto-plastic particle-surface contact showed that particles of diameter limited up to 3 μm are able to reach experimentally obtained critical velocity without additional heating. For particle sizes above 10 μm, additional heating is needed for deposition. The maximum coefficient of restitution (COR) is achieved with a particle size of 30 μm; smaller particles are characterized by the values of COR, which are lower due to a relatively high velocity. Particles larger than 30 μm are scalable, characterized by a small change in velocity and a rise in temperature as their mass increases.

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Section: Convergent Sectionmentioning

confidence: 99%

Numerical Study of Powder Flow Nozzle for Laser-Assisted Metal Deposition

et al. 2021

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“…Design of the Nozzle Inlet Diameter. After consulting relevant literature, Chen et al 46 proposed a design for supersonic nozzles that recommended the nozzle inlet be made as large as possible within structural constraints and that it should be at least larger than the nozzle outlet diameter. Therefore, the inlet diameter of the nozzle was designed based on the calculated nozzle outlet diameter.…”

Section: Nozzle Outlet Diameter Designmentioning

confidence: 99%

New Design Method of a Supersonic Steam Injection Nozzle and Its Numerical Simulation Verification

Wang,

Pang,

Tian

et al. 2023

ACS Omega

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Steam huff-n-puff in horizontal wells often had limitations, such as uneven steam injection and low reservoir utilization. To improve steam injection efficiency, a new method for designing a supersonic nozzle was proposed based on the principles of aerodynamics and thermodynamics. The nozzle featured a tapering section, a throat, and a diverging section. The best geometric shape of the tapering section was the Witoszynski curve. A set of nozzle size designs were established, and the size parameters were optimized. The results showed that the nozzle could inject steam into the formation at supersonic speed and it had the characteristics of constant flow rate and uniform development of the steam chamber. According to the steam Reynolds number and the good aggregation distribution characteristics of the size design model, three sequential nozzles of 3.0, 5.0, and 6.5 mm were formed based on the throat. When the throat diameter was 5.0 mm, the tapering length was 4.3 mm, the diverging length was 5.5 mm, the throat length was 3.0 mm, the inlet diameter was 9.8 mm, and the outlet diameter was 6.2 mm. Numerical simulations indicated that the pressure drop loss during steam huff-n-puff injection in horizontal wells was within 10%. It was of great significance to establish the nozzle size design model of the steam injection effect of horizontal wells.

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“…Jiang et al carried out numerical simulations of CO2 condensation in supersonic nozzles, including the effect of operating parameters [21], the profile of nozzle converging part [22], and swirling flows [23] on the phase change process. Chen et al [24] numerically evaluated the effect of the nozzle exit area on the CO2 condensation based on the mixture of CH4-CO2. They found that a larger nozzle exit area increased the liquefaction efficiency but decreased the separation efficiency.…”

Section: Introductionmentioning

confidence: 99%