PIV measurements and a CFD benchmark study of a screen under fan-induced swirl conditions

Bengoechea, A.; Antón, Raúl; Larraona, Gorka S.; Rivas, Alejandro; Ramos, Juan Carlos; Masip, Yunesky

doi:10.1016/j.ijheatfluidflow.2013.12.007

Cited by 4 publications

(16 citation statements)

References 30 publications

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“…Furthermore, it is important to highlight that the shape of the flow at the inlet plays an important role in the value of the pressure drop. Bengoechea et al (2014) showed that the experimentally measured pressure values for these kinds of configurations under fan induced swirl conditions are far away from those provided by handbooks like Idelchick (2003), where the flow approaching the screen is supposed to be perpendicular, i.e. without any tangential component and homogenized at the same time.…”

Section: Total Pressure Drop Between Inlet and Outlet Cross Sections mentioning

confidence: 66%

“…The Reynolds stresses at the inlet are obtained through the value of the turbulent kinetic energy (k) and the turbulent intensity. The difference in the results between modeling the turbulence at the inlet as explained Bengoechea et al (2014) and the experimentally measured Reynolds stresses explained in this work has been analyzed. With this aim, in both cases or numerical simulations presented in that benchmark study, the turbulence at the inlet was modeled as proposed in this work.…”

Section: Boundary Conditionsmentioning

confidence: 96%

“…The constant values of axial and tangential velocity for each case are such that the mean axial velocity (V) and the swirl number (S) conditions at the inlet coincide with the values shown in Table 1. The experimental measurements obtained by Bengoechea et al (2014) showed that the average level of turbulent intensity is expected to be around 50%. Therefore, the turbulence at the inlet for all the cases has been defined through the hydraulic diameter (D h ) of the section (as it is a square section D h ends up being equal to D) and a constant turbulent intensity of 50%.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…) and close the system of Eqs. 7and 8, the RSTM proposed by Launder and Shima (1989) has been used, as Bengoechea et al (2014) demonstrated that this was a better choice than the models based on the Boussinesq assumption when simulating these kinds of swirl flows. RSTM involves six transport equations for the independent stresses, , and usually a transport equation for the turbulent dissipation rate, (ε).…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…In Bengoechea et al (2014), a benchmark study of different turbulence models was carried out in order to simulate a screen with this kind of flow.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Geometrical Parameters in The Downstream Flow of A Screen Under Fan-Induced Swirl Conditions

Bengoechea

Antón

Larraona

et al. 2014

Engineering Applications of Computational Fluid Mechanics

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A perforated plate placed downstream of an axial fan in order to avoid electromagnetic interferences (push cooling) is a common assembly in electronic systems. Because of the swirling component that the flow approaching the screen has, there is no accuracy in knowing how the screen affects the flow pattern downstream of the screen and the pressure drop through the screen. Since cooling capacity is related to velocity, the placement of the components downstream of the screen will be related to the velocity magnitude. Thus, properly predicting the flow pattern is highly important, and the results of this work may serve a good guideline for thermal designers to surmount this challenge. In order to establish how the screen affects the flow pattern, a parametric study is carried out. This study is performed by a Central Composite Face-centered (CCF) Design of Experiment (DoE), which demanded 81 Computational Fluid Dynamics (CFD) simulations and for which the Reynolds Stress Transport Model (RSTM) was used as a turbulence model. Thanks to the numerical results, the influence that different operational and geometrical parameters have on the flow pattern downstream of a screen and on the total pressure drop is analyzed. The swirl that the flow has at the inlet is found to be related to the screen's capacity to homogenize the flow downstream of the screen, as its thickness plays an important role in the flow's tangential component destruction. The main effects of the parameters and the interactions between them are shown. At the same time, through DoE techniques, different reduced models that predict how the flow pattern changes because of the screen are presented as useful tools for thermal designers.

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Section: Total Pressure Drop Between Inlet and Outlet Cross Sections mentioning

confidence: 66%

Section: Boundary Conditionsmentioning

confidence: 96%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Mathematical Modelingmentioning

confidence: 99%

“…In Bengoechea et al (2014), a benchmark study of different turbulence models was carried out in order to simulate a screen with this kind of flow.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Geometrical Parameters in The Downstream Flow of A Screen Under Fan-Induced Swirl Conditions

Bengoechea

Antón

Larraona

et al. 2014

Engineering Applications of Computational Fluid Mechanics

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A holistic performance evaluation of ventilation radiators – An assessment according to EN 442-2 using numerical simulations

Ploskić

Wang

Sadrizadeh

2019

Journal of Building Engineering

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Desarrollo de una metodología para la predicción de curvas características en bombas periféricas.

Valencia

Peñaloza

Forero

2020

AiBi Revista de Investigación, Administración e Ingeniería

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Las bombas rotodinámicas han presentado un desarrollo muy notable en los últimos años; debido a esto, su implementación se ha diversificado ampliamente en aplicaciones industriales y domiciliarias. La modificación de los parámetros de operación que definen las características de la bomba regenerativa afecta directamente su eficiencia. Por otro lado, las curvas características que determinan el comportamiento hidráulico de una bomba son utilizadas para definir el punto de operación y escoger una bomba adecuada para las condiciones de funcionamiento de un sistema hidráulico. En este artículo, se presenta una metodología para ajustar la curva teórica de una bomba rotodinámica periférica utilizando factores que influyen en su desempeño considerando que limitaciones físicas que se presentan durante su operación afectan la precisión en la descripción del fenómeno. La ecuación de Euler es utilizada para determinar un conjunto de correlaciones que describen el comportamiento real de la bomba periférica tomando en cuenta la velocidad absoluta del alabe y la componente periférica de la velocidad del fluido que interactúa con el rodete; luego, los datos generados son utilizados para comparar la ecuación de la velocidad del flujo definida con la caracterización geométrica de una bomba regenerativa disponible en el mercado. Por último, se desarrolló una modificación en la ecuación teórica de Euler para predecir la curva real de la bomba regenerativa alcanzando un porcentaje de error menor al 5%.

show abstract

PIV measurements and a CFD benchmark study of a screen under fan-induced swirl conditions

Cited by 4 publications

References 30 publications

Influence of Geometrical Parameters in The Downstream Flow of A Screen Under Fan-Induced Swirl Conditions

Influence of Geometrical Parameters in The Downstream Flow of A Screen Under Fan-Induced Swirl Conditions

A holistic performance evaluation of ventilation radiators – An assessment according to EN 442-2 using numerical simulations

Desarrollo de una metodología para la predicción de curvas características en bombas periféricas.

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