Impingement pressure characteristics of swirling and non-swirling turbulent jets

Ahmed, Zahir U.; Al-Abdeli, Yasir M.; Guzzomi, Ferdinando

doi:10.1016/j.expthermflusci.2015.07.017

Cited by 46 publications

(30 citation statements)

References 56 publications

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“…• Axis: Symmetry axis boundary condition (with zero flux of all quantities across the symmetry boundary). • Inlet: The axial and azimuthal velocity profiles, together with their turbulence characteristics (Ahmed et al, 2015) are imposed onto the simulation as profile files (.prof) in ANSYS-FLUENT. The procedure that has been followed to input the turbulence profiles is described below.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

See 1 more Smart Citation

Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Granados-Ortiz

Leon-Prieto

Ortega-Casanova

2020

Engineering Applications of Computational Fluid Mechanics

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Section: Formulation Of the Problemmentioning

confidence: 99%

“…According to Ahmed et al (2015), the turbulent characteristics of the imposed jets are not constant at the nozzle exit (inlet of the computational domain). Thus, this property must be modeled as a profile inlet condition, as done for the inlet velocity profiles.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Granados-Ortiz

Leon-Prieto

Ortega-Casanova

2020

Engineering Applications of Computational Fluid Mechanics

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“…To further analyze the characteristics of the swirling flow field, the swirl number (S) was obtained by the following equation (Ahmed et al, 2015):…”

Section: Velocity Distributionmentioning

confidence: 99%

“…More recently, Ahmed et al (2015) experimentally investigated the effects of swirl on the impingement surface pressure for an incompressible, turbulent, swirling impinging air jet. The effect of swirl number, nozzle-to-plate distance, and Reynolds number on the pressure distribution was examined.…”

Section: Introductionmentioning

confidence: 99%

Study of the swirling flow field induced by guide vanes using electrical resistance tomography and numerical simulations

Zhang

et al. 2018

Chemical Engineering Communications

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In this work, the swirling flow field induced by guide vanes was studied using electrical resistance tomography (ERT) and numerical simulations. The results show that the two-phase water and oil mixture moves in the same axial direction for this type of flow field, which is very unlike the flow behavior of a traditional hydrocyclone with a tangential inlet. In the pipe behind the guide vanes, the smallest axial velocity and tangential velocity are located at the center of the pipe. From the pipe center to the pipe wall, both pressure and velocity increase gradually. Downstream of guide vanes, the maximal oil volume fraction is observed at the center of the pipe. From the center of the pipe to the inner wall, the oil volume fraction gradually decreases. Moreover, ERT can precisely show the oil distribution in the pipe section. These studies prove the possibility of efficient oil and water mixture separation by guide vanes, and the results may be very important for guiding the optimal design of vane-type pipe separators.

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“…For the swirling impinging jet, Bakirci et al [ 20 ] found that increasing the helical angle can increase the uniformity of radial heat transfer on the plate surface. Ahmed et al [ 21 , 22 , 23 , 24 ] studied the impingement pressure, flow, and heat transfer characteristics of swirling and non-swirling flows. The results showed that the pressure coefficient at the stagnation point is the same as that of non-swirling flow for the low-intensity swirling flow, and has a maximum value.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Swirling Impinging Jet Issuing from a Threaded Hole under Inclined Condition

Xiong

et al. 2019

Entropy

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There are some inclined jet holes in the cooling structure of the leading edge region of gas turbine blades. In order to improve the cooling effect of traditional round holes, this paper proposes to replace the round holes with threaded holes, and studies the complex flow and heat transfer performance of the swirling impinging jet (SIJ) issuing from the 45° threaded holes in the inclined condition by numerical simulation. The influencing factors include jet inclination angle α (45°–90°), jet-to-plate distance (H/d = 2, 4, 6), and Reynolds number (6000–24,000). The results show that the inclination angle and jet-to-plate distance have a great influence on the size, shape, and position of vortices in the jet space, while the Reynolds number has little effect on the vortices. In the inclined state, the impinging cooling effect of the swirling impinging jet is better than that of the circular impinging jet (CIJ), both heat transfer coefficients will degrade significantly when the inclination angle is 45°. When the inclination angle is greater than 45°, compared with the round hole, the enhanced heat transfer region for the swirling jet is in the region of r/d < 3, while both of the Nusselt numbers in the wall jet region are weak, with a value of just 20. At the same time, with the increasing of the inclination angle (α > 45°), the average Nusselt number on target surface holds a constant value. Under the inclined conditions, the heat transfer coefficient on the target surface for the swirling jet is increased totally with the increasing of the Re, but when the Re is larger than 18,000, the rate of enhanced heat transfer gradually weakens.

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Impingement pressure characteristics of swirling and non-swirling turbulent jets

Cited by 46 publications

References 56 publications

Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Study of the swirling flow field induced by guide vanes using electrical resistance tomography and numerical simulations

Numerical Simulation of Swirling Impinging Jet Issuing from a Threaded Hole under Inclined Condition

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Impingement pressure characteristics of swirling and non-swirling turbulent jets

Cited by 46 publications

References 56 publications

Computational study of the application of Al2O3 nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Computational study of the application of Al2O3 nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Study of the swirling flow field induced by guide vanes using electrical resistance tomography and numerical simulations

Numerical Simulation of Swirling Impinging Jet Issuing from a Threaded Hole under Inclined Condition

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Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes

Computational study of the application of Al₂O₃ nanoparticles to forced convection of high-Reynolds swirling jets for engineering cooling processes