Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

Sodjavi, Kodjovi; Montagné, Brice; Bragança, Pierre; Meslem, Amina; Bode, Florin; Kristiawan, Magdalena

doi:10.1007/s11012-015-0181-5

Cited by 10 publications

(7 citation statements)

References 61 publications

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“…They selected circular, square, and rectangular nozzles of equal hydraulic diameters for a comparative study. Sodjavi et al [8] investigated the characteristics of cross-shaped impinging jets and the resulting wall shear rates and mass transfer using electrodiffusion techniques and the particle image velocimetry (PIV) method. High-resolution PIV was also used to study the flow characteristics in the near field of rectangular, square, elliptic, and triangular water jets [9,10].…”

Section: Introductionmentioning

confidence: 99%

Impinging Performance of High-Pressure Water Jets Emitting from Different Nozzle Orifice Shapes

Huang

et al. 2020

Geofluids

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The impinging pressure of a water jet is a key factor in engineering applications, and the jet shape has a great influence on this pressure. In this paper, five different nozzle shapes were designed, and impacting tests were conducted based on a self-designed experimental platform using a PVDF piezoelectric film sensor and a high-speed camera to record the impacting data. Additionally, the computational fluid dynamics (CFD) method was also applied to study the velocity distribution. The results show that the pressure profiles of different water jet shapes impacting onto a solid surface present a consistent pattern, namely, an initial transient and enormous peak pressure and then a longer and smaller stagnation pressure. Although the stagnation pressure in this paper is not sufficiently obvious, the peak pressures of the five water jet shapes are much different from one another. Under the same inlet pressure, the peak pressure of the circular water jet is the largest, and those of the square, triangular, cross-shaped, and elliptical water jets decrease in turn. The flowing regimes captured by the high-speed camera together with the CFD simulation results indicate that the discrepancy in the peak pressure may be a combined action of the liquid velocities and jet head shapes.

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Section: Introductionmentioning

confidence: 99%

Impinging Performance of High-Pressure Water Jets Emitting from Different Nozzle Orifice Shapes

Huang

et al. 2020

Geofluids

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“…The evaluation of the global mass transfer is obtained using the average Sherwood number, which for a disc of 3.2D e in diameter reveals an improvement up to 25 and 22 % for cross-shaped orifice on a plane or on a hemisphere, respectively, compared to a convergent nozzle. The study of a cross-shaped orifice on a hemisphere nozzle geometry showed an increase for local and global mass transfer [61].…”

Section: The Effect Of Nozzle Designmentioning

confidence: 99%

Heat and mass transfer enhancement strategies by impinging jets: A literature review

2021

Self Cite

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Heat and mass transfer can be greatly increased when using impinging jets, regardless the application. The reason behind this is the complex behavior of the impinging jet flow which is leading to the generation of a multitude of flow phenomena, like: large-scale structures, small scale turbulent mixing, large curvature involving strong normal stresses and strong shear, stagnation, separation and re-attachment of the wall boundary layers, increased heat transfer at the impinged plate. All these phenomena listed above have highly unsteady nature and even though a lot of scientific studies have approached this subject, the impinging jet is not fully understood due to the difficulties of carrying out detailed experimental and numerically investigations. Nevertheless, for heat transfer enhancement in impinging jet applications, both passive and active strategies are employed. The effect of nozzle geometry and the impinging surface macrostructure modification are some of the most prominent passive strategies. On the other side, the most used active strategies utilize acoustical and mechanical oscillations in the exit plane of the flow, which in certain situations favors mixing enhancement. This is favored by the intensification of some instabilities and by the onset of large scale vortices with important levels of energy.

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“…Ozmen and Ipek [79] studied an array of four slot jets with both numerical and experimental techniques with and without crossflow effects. Sodjavi et al [80] experimentally observed that a hemispherical cross-shaped nozzle performed much better than a regular orifice jet. They had a single free jet configuration.…”

Section: Jet Orificementioning

confidence: 99%

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

Dutta

Singh

2021

Energies

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Impingement heat transfer is considered one of the most effective cooling technologies that yield high localized convective heat transfer coefficients. This paper studies different configurable parameters involved in jet impingement cooling such as, exit orifice shape, crossflow regulation, target surface modification, spent air reuse, impingement channel modification, jet pulsation, and other techniques to understand which of them are critical and how these heat-transfer-enhancement concepts work. The aim of this paper is to excite the thermal sciences community of this efficient cooling technique and instill some thoughts for future innovations. New orifice shapes are becoming feasible due to innovative 3D printing technologies. However, the orifice shape variations show that it is hard to beat a sharp-edged round orifice in heat transfer coefficient, but it comes with a higher pressure drop across the orifice. Any attempt to streamline the hole shape indicated a drop in the Nusselt number, thus giving the designer some control over thermal budgeting of a component. Reduction in crossflow has been attempted with channel modifications. The use of high-porosity conductive foam in the impingement space has shown marked improvement in heat transfer performance. A list of possible research topics based on this discussion is provided in the conclusion.

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Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

Cited by 10 publications

References 61 publications

Impinging Performance of High-Pressure Water Jets Emitting from Different Nozzle Orifice Shapes

Impinging Performance of High-Pressure Water Jets Emitting from Different Nozzle Orifice Shapes

Heat and mass transfer enhancement strategies by impinging jets: A literature review

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

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