Simulation of cavitation of spherically shaped hydrogen bubbles through a tube nozzle with stenosis

Ellahi, R.; Zeeshan, A.; Hussain, Farooq; Safaei, Mohammad Reza

doi:10.1108/hff-04-2019-0311

Cited by 17 publications

(5 citation statements)

References 52 publications

(98 reference statements)

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“…The temperature shows a steep downward trend, similar to the trend of the pressure distribution along the central nozzle axis. This is in line with the ideal gas equation for compressible flow that states that pressure is directly proportional to temperature [55][56][57]. Therefore, there is a drop in the temperature after the flow reaches the throat, concluding that the smallest angle causes the lowest temperature along the nozzle cavity before the flow reaches the throat.…”

Section: Resultssupporting

confidence: 80%

Optimizing nozzle convergent angle using central composite design on the particle velocity and acoustic power level for single-hose dry ice blasting nozzle

Mat

Asmuin

Basir

et al. 2020

J Therm Anal Calorim

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One of the important parameters in developing dry ice blasting nozzle is the high-speed dry ice pellets. However, many studies focus primarily only on its performance without considering the noise emission that comes from an operating nozzle. In this method, the central composite optimization tool has been used. The two-way mass momentum and energy exchange are successfully modeled using the two-way mass momentum model. As an attempt to theoretically verify the model accuracy, a comparison is conducted on the density, pressure, temperature, as well as Mach number ratios corresponding to various ratios of nozzle area. In return, the smallest value of the convergent angle results in the highest velocity of 516.75 m s −1 , as well as the highest level of the acoustic power level of 144.36 dB. Besides, one of the vital influencing factors on the emitted acoustic power level is the turbulence intensity, which can achieve a maximum of 1% intensity for an angle of 20° at the throat section. Besides, the same negative sensitivity of around − 0.99% is provided by the velocity and acoustic power level, which is highly responsive toward the convergent angle variation. Furthermore, the optimum nozzle convergent angle for the minimization of the acoustic power level and maximization of the velocity is 7.03°. The novelty of this research lies in the findings on the effective convergent angle of the dry ice blasting nozzle that accelerates the particle flow and minimizes the noise emission from the operating nozzle.

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Section: Resultssupporting

confidence: 80%

Optimizing nozzle convergent angle using central composite design on the particle velocity and acoustic power level for single-hose dry ice blasting nozzle

Mat

Asmuin

Basir

et al. 2020

J Therm Anal Calorim

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“…They reported a decrease in velocity due to resistive force, which acts in the opposite direction of fluid motion. Further, Ellahi et al (2020b), Ahmed et al (2019) and Zeeshan et al (2019) carried out numerical studies on fluid flow with nanoparticle mixtures. The additional references in the study of hybrid nanofluid are listed from the literature, such as Manjunatha et al (2019), Waini et al (2019c), Devi and Devi (2016a) and most recently by Yashkun et al (2020b).…”

mentioning

confidence: 99%

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Yashkun

Zaimi

Ishak

et al. 2020

HFF

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Purpose This study aims to investigate the flow and heat transfer of a hybrid nanofluid through an exponentially stretching/shrinking sheet along with mixed convection and Joule heating. The nanoparticles alumina (Al2O3) and copper (Cu) are suspended into a base fluid (water) to form a new kind of hybrid nanofluid (Al2O3-Cu/water). Also, the effects of constant mixed convection parameter and Joule heating are considered. Design/methodology/approach The governing partial differential equations are transformed into ordinary differential equations (ODEs) using appropriate similarity transformations. The transformed nonlinear ODEs are solves using the bvp4c solver available in MATLAB software. A comparison of the present results shows a good agreement with the published results. Findings Dual solutions for hybrid nanofluid flow obtained for a specific range of the stretching/shrinking parameter values. The values of the skin friction coefficient increases but the local Nusselt number decreases for the first solution with the increasing of the magnetic parameter. Enhancing copper volume fraction and Eckert number reduces the surface temperature, which intimates the decrement of heat transfer rate for the first and second solutions for the stretching/shrinking sheet. In detail, the first solution results show that when the Eckert number increases as 0.1, 0.4 and 0.7 at λ = 1.5, the temperature variations reduced to 10.686840, 10.671419 and 10.655996. While in the second solution, keeping the same parameters temperature variation reduced to 9.750777, 9.557349 and 9.364489, respectively. On the other hand, the results indicate that the skin friction coefficient increases with copper volume fraction. This study shows that the thermal boundary layer thickness rises due to the rise in the solid volume fraction. It is also observed that the magnetic parameter, copper volume fraction and Eckert number widen the range of the stretching/shrinking parameter for which the solution exists. Practical implications In practice, the investigation on the flow and heat transfer of a hybrid nanofluid past an exponentially stretching/shrinking sheet with mixed convection and Joule heating is crucial and useful. The problems related to hybrid nanofluid have numerous real-life and industrial applications, such as microelectronics, manufacturing, naval structures, nuclear system cooling, biomedical and drug reduction. Originality/value In specific, this study focuses on increasing thermal conductivity using a hybrid nanofluid mathematical model. The novelty of this study is the use of natural mixed convection and Joule heating in a hybrid nanofluid. This paper can obtain dual solutions. The authors declare that this study is new, and there is no previous published work similar to the present study.

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“…If the bubble collapses inside the orifice are of the nozzle, the erosion phenomena occur which is extremely detrimental and can reduce the nozzle efficiency [15,16]. On the other hand, bubble collapse at the outlet region of the nozzle, can cause atomization which is significantly beneficial for the air-fuel mixing process and can noticeably improve the combustion quality of the combustion engines [17,18]. There have been many studies performed both numerically and experimentally to understand the behavior of bubble formation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cavitation Formation on Velocity and Vorticity

Ferdowsian¹

2022

IJSEA

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In this study, flow in a rectangular shape nozzle has been simulated. Fully hexahedral mesh elements are utilized with having boundary layer mesh in order to avoid excessive mesh destiny in the orifice area. It was found that velocity magnitude, axial velocity and vorticity magnitude increases intensely at the beginning of the orifice area which makes it possible for the cavitation phenomena to occur rapidly. The cavitation that occurs inside diesel fuel injector nozzles has a significant impact on atomization, and modelling this phenomenon will be useful in future injector development. The Schnerr cavitation model was chosen among three distinct cavitation models available in Ansys Fluent v21 because it is capable of properly forecasting choke conditions in cavitating flow. The two-phase flow inside a nozzle is assumed to be a homogenous combination of vapor, liquid, and noncondensable gas in this model. The pressure and velocity profiles derived from the simulations were compared to planar throttle flow experimental findings.

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Simulation of cavitation of spherically shaped hydrogen bubbles through a tube nozzle with stenosis

Cited by 17 publications

References 52 publications

Optimizing nozzle convergent angle using central composite design on the particle velocity and acoustic power level for single-hose dry ice blasting nozzle

Optimizing nozzle convergent angle using central composite design on the particle velocity and acoustic power level for single-hose dry ice blasting nozzle

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Effect of Cavitation Formation on Velocity and Vorticity

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