Numerical investigation on the efficacy of jet obliquity for fluid flow and thermal characteristics of turbulent offset jet

Rathore, Sanjay Singh; Verma, Suresh Kant

doi:10.1007/s00231-021-03156-0

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…In the multiphase flow simulation, compared with VOF model and Eulerian model, the Mixture model is easier to converge in calculation and is suitable for analyzing the multiphase fluid flow with different velocities. [29][30][31] Moreover, in the simulation calculation of high-speed flow for gas-liquid two-phase flow, RNG k-ε turbulence model is more advantageous because an additional term is added to the ε equation, which makes it more accurate for the flow field simulation with large difference in velocity gradient and with large deformation flow. [32][33][34] Therefore, Mixture multiphase flow model and RNG k-ε turbulence model were adopted in the numerical calculation of this paper.…”

Section: Governing Equationsmentioning

confidence: 99%

“…This paper will mainly study the flow characteristics of jet with air ring for different nozzle structures, which involves the gas–liquid two‐phase mixed flow. In the multiphase flow simulation, compared with VOF model and Eulerian model, the Mixture model is easier to converge in calculation and is suitable for analyzing the multiphase fluid flow with different velocities 29–31 . Moreover, in the simulation calculation of high‐speed flow for gas‐liquid two‐phase flow, RNG k–ε turbulence model is more advantageous because an additional term is added to the ε equation, which makes it more accurate for the flow field simulation with large difference in velocity gradient and with large deformation flow 32–34 .…”

Section: Numerical Model Buildingmentioning

confidence: 99%

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Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Zhang

et al. 2022

Energy Science & Engineering

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A water jet with an air ring protective layer is a promising rock-breaking and cutting rate improvement method in submerged environment, such as oil-gas drilling. The jet flow field characteristic determines the jet impinge performance and is affected by nozzle structure parameters. In this study, the water jet flow with air ring under submerged environment was numerically simulated. The jet flow field structure with air ring was obtained by analyzing the distributions of jet velocity and air content at different cross sections. The effects of several critical nozzle structure parameters on jet isokinetic core length and axial velocity were investigated by adopting the orthogonal design method. The results show that the jet flow field structure with air ring in radial direction includes a high-speed water jet zone, air ring protective layer, and air-water mixed zone, having the advantages of concentrated energy in axis region, long core section length, and lowvelocity attenuation. The influence degrees of nozzle structure parameters on jet core section length and axial velocity at X = 0.3 m are: length-diameter ratio > outlet diameter > conic angle > air nozzle diameter > water-air nozzle spacing and outlet diameter > length-diameter ratio > conic angle > water-air nozzle spacing > air nozzle diameter, respectively. The jet core section length and axial velocity both increase exponentially with the increasing outlet diameter, both first increase rapidly and then slowly decreases with the increase of conic angle and water-air nozzle spacing. There is the optimal conic angle of 15°and appropriate water-air nozzle spacing of 3-5 mm. With the increase of length-diameter ratio, they both first decrease rapidly and then slow down, indicating that conical nozzle is more suitable for water jet with air ring. And 0.9-1.2 mm is proper for the air nozzle diameter.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Numerical Model Buildingmentioning

confidence: 99%

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Zhang

et al. 2022

Energy Science & Engineering

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“…Heat transfer coefficient values as high as 650 W/m 2 K were obtained with highfrequency diaphragm movement. Rathore and Verma (2022) performed numerical work about the effects of variation in Re and offset ratio (OR) on turbulent flow and thermal characteristics of oblique offset jet. Re and OR were considered in the range of Re=10000-25000 and OR=3-11.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Heat Transfer Improvements of Graphene Oxide-Water and Diamond-Water Nanofluids in Cross-Flow-Impinging Jet Flow Channels Having Fin

Karabulut

2023

Isı Bilimi Ve Tekniği Dergisi

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In this study, the heat transfer from two different model surfaces (roof and crown) and flow structure in the channels with the cross flow-impinging jet flow were numerically analyzed by using water, 0.02% GO (Graphene Oxide)-Water and 2% Diamond-Water nanofluids. The numerical study was carried out steady and three dimensional using the Ansys-Fluent program with k-ε turbulence model. A fin with 90o angle was added on the upper channel surface from the impinging jet inlet at distinct distances. A constant heat flux of 1000 W/m2 was applied to the model surfaces. The channel heights are fixed and the Re range of the fluids is 5000-15000. The numerical results obtained from the study were compared with the results of the experimental studies in the literature and it was seen that the results were compatible and acceptable. The results of the study were comparatively examined for water and nanofluids as the mean Nu and surface temperature variations for each model in the channels without fins and at different fin distances. Also, velocity and temperature contour distributions of the combined jet Diamond-Water nanofluid flow were visualized. However, performance coefficient (C) and mean Nu (Num) and, surface temperature values (Tm) were evaluated for all three patterned surfaces in the channels. Num increases for GO-Water nanofluid at Re=15000 and fin distance of 2D are 47.53% and 57.42% compared to the case of using finless and water fluid for the roof and crown model surfaces, respectively.

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Free convection cooling of a real-scale IRS device with a louvered cylindrical funnel: A three dimensional numerical study

Chandrakar

Mukherjee

Senapati

2022

International Communications in Heat and Mass Transfer

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Numerical investigation on the efficacy of jet obliquity for fluid flow and thermal characteristics of turbulent offset jet

Cited by 7 publications

References 34 publications

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Investigation of Heat Transfer Improvements of Graphene Oxide-Water and Diamond-Water Nanofluids in Cross-Flow-Impinging Jet Flow Channels Having Fin

Free convection cooling of a real-scale IRS device with a louvered cylindrical funnel: A three dimensional numerical study

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