Flow–pressure drop characteristics of perforated plates

Tanner, Peter; Gorman, John M; Sparrow, E. M.

doi:10.1108/hff-01-2019-0065

Cited by 36 publications

(35 citation statements)

References 22 publications

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“…Equation (1) has been proven to be accurate for many canonical porous surfaces, and it is applicable within the limit of Stokes flow, namely for small values of the pore Reynolds number Re p = ρdU p /µ, where U p is the velocity inside the pore. However, deviations from Darcy's law for increasing Re p are well documented in the literature [17][18][19], and have been associated with nonlinear effects that arise at high pore Reynolds numbers. Re p is higher for perforated plates than for other porous surfaces and therefore Equation ( 1) is replaced by, ∆P t…”

Section: Introductionmentioning

confidence: 99%

“…At sufficiently high pore Reynolds number, Darcy drag can be assumed negligible and the entirety of the pressure drag is due to the nonlinear term. The pressure drop characteristics of perforated plates at high Reynolds numbers Re p ≥ O(10 2 ) have been studied extensively both numerically [17] and experimentally [20][21][22][23][24]; however Equation (2) for the normal flow has never been associated to the case of grazing boundary layer over porous surfaces, for which Darcy's law has always been used, to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

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Permeability and turbulence over perforated plates

Shahzad¹,

Hickel²,

Modesti³

2022

Preprint

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We perform direct numerical simulations of turbulent flow at friction Reynolds number Reτ ≈ 500 − 2000 grazing over perforates plates with moderate viscous-scaled orifice diameter d + ≈ 40-160 and analyse the relation between permeability and added drag. Unlike previous studies of turbulent flows over permeable surfaces, we find that flow inside the orifices is dominated by inertial effects, and that the relevant permeability is the Forchheimer and not the Darcy one. We find evidence of a fully rough regime where the relevant length scale is the inverse of the Forchheimer coefficient, which can be regarded as the resistance experienced by the wall-normal flow. Moreover, we show that, for low porosities, the Forchheimer coefficient can be estimated with good accuracy using a simple analytical relation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permeability and turbulence over perforated plates

Shahzad¹,

Hickel²,

Modesti³

2022

Preprint

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“…The major finding was that the split scheme resulted in the highest thermal performance for the heating tube. Tanner et al (2019) quantified numerically the pressure drop for the fluid flow through the perforated plate inside a pipe. Their results displayed that the homogenization of fluid flow was a trade-off of pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer promotion in channel laminar flow employing a slab with slits and inclined ribs protruding across

Perng

2021

HFF

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Purpose The purpose of this study is to promote laminar heat transfer from the channel heated through a slab with slits and inclined ribs protruding across. Design/methodology/approach The novel design of this study is performed through making the slits in the slab (C1–C3: with slits; C4–C6: without slits) and changing the vertical location of this slab (1/4, 1/2 and 3/4 channel height). The thermal fluid characteristics of all cases are analyzed for various Reynolds numbers (500, 1,000, 1,500 and 2,000) by the SIMPLE-C algorithm. Findings The results display that the ribbed slab effectively improves the heat transfer. The slits can modify the flow field in the vortexes around the inclined ribs and remove more heat from this zone to promote the heat transfer. As compared with C0 (without a slab), C2 (the slab with slits and inclined ribs protruding across located vertically on the 3/4 channel height) raises the averaged Nusselt number up to 27.7% at Re = 2,000. As compared with C4 (without slits), C1 (with slits) gains the maximum increase in the averaged Nusselt number by 5.07% at Re = 1,000. Research limitations/implications The constant thermo-physical properties of incompressible fluid and the steady flow are considered in this study. Practical implications The numerical results will profit the design of heated passageway using a slab with slits and inclined ribs protruding across to acquire better heat transfer promotion. Originality/value This slab with slits and inclined ribs protruding across can be applied to the heat transfer promotion and thus be viewed as a useful cooling mechanism in the thermal engineering.

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“…Antón et al [11] study the effect of various parameters, and they also give the correlations for predicting the effect of the main parameters (porosity of the screen and distance between fan and screen) for the points of the characteristic curve with the highest static pressure (Q = 0) and volumetric flow (∆P s = 0). In a similar way, the characterization of the pressure drop coefficients of perforated plates in ducts by means of numerical simulations of complete detailed models was addressed by Tanner et al [12], who obtained correlations of the pressure drop as a function of the Reynolds number and using as parameters the porosity and the thickness of the plates, or Miguel [13], where the influence of the porosity and the Reynolds numbers on the pressure loss factors was analyzed. For each axial fan in the figure, there is an associated difficulty.…”

Section: Introductionmentioning

confidence: 99%

Compact Model of a Screen under Fan-Induced Swirl Conditions Using a Porous Media Approach

et al. 2021

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A perforated plate in an electronic device is typically placed downstream of an axial fan (push cooling) in order to avoid electromagnetic interferences. Because of the swirling component in the flow approaching the screen, determining how the screen affects the flow pattern downstream of the screen is a challenge. It is important to understand this interaction, as the correct location of the electronic components will depend on the flow pattern (the components that dissipate more heat will be located where the maximum magnitude of the velocity is located). This work aims to present an approach of the flow pattern via a compact model based on three directional pressure loss coefficients. The values for the pressure loss coefficients are obtained through different correlations depending on the flow and geometric characteristics for the case that is being modeled. These correlations are obtained through an iterative process that compares different flow patterns obtained through different modeling strategies: the compact one that is presented in this paper and another detailed one, which was validated in previous works. Results show that if this compact model is used, an approximation of the flow pattern could be obtained with a huge decrease in the amount of time invested.

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Flow–pressure drop characteristics of perforated plates

Cited by 36 publications

References 22 publications

Permeability and turbulence over perforated plates

Permeability and turbulence over perforated plates

Heat transfer promotion in channel laminar flow employing a slab with slits and inclined ribs protruding across

Compact Model of a Screen under Fan-Induced Swirl Conditions Using a Porous Media Approach

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