Jet impingement heat transfer – Part I: Mean and root-mean-square heat transfer and velocity distributions

O’Donovan, Tadhg S.; Murray, Darina B.

doi:10.1016/j.ijheatmasstransfer.2007.01.044

Cited by 196 publications

(111 citation statements)

References 22 publications

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“…And, what is most important from a numerical point of view, their numerical results, obtained with the commercial code Fluent© and the Shear Stress Transport (SST) k − ω turbulence model for values of Reynolds number (Re)r a n g i n gf r o m 10E3 to 30E3, agree very well with previous experimental results obtained by Fenot et al (2005), Lee et al (2002) and Baughn et al (1991). More experimental results are given by O'Donovan & Murray (2007), who studied the impinging of non-swirling jets, and by Bakirci et al (2007), about the impinging of a swirling jet, against a solid wall. The last ones visualize the temperature distribution on the wall and evaluate the heat transfer rate.…”

Section: Introductionsupporting

confidence: 84%

Numerical Simulation of the Heat Transfer from a Heated Solid Wall to an Impinging Swirling Jet

Ortega-Casanova¹

2011

Two Phase Flow, Phase Change and Numerical Modeling

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Section: Introductionsupporting

confidence: 84%

Numerical Simulation of the Heat Transfer from a Heated Solid Wall to an Impinging Swirling Jet

Ortega-Casanova¹

2011

Two Phase Flow, Phase Change and Numerical Modeling

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“…The synthetic jet impinges onto a surface consisting of a heated copper plate (450550mm 2 ,5mm thick) approximating a uniform wall temperature boundary condition as verified in previous studies [13,26]. Heating is provided using a 1.1mm thick silicon heater mat which is adhered to the underside of the plate on one side and insulated on the other.…”

Section: Impinging Synthetic Jet Test Facilitymentioning

confidence: 99%

Flow regime characterisation of an impinging axisymmetric synthetic jet

McGuinn

Farrelly

Persoons

et al. 2013

Experimental Thermal and Fluid Science

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-Impinging synthetic jets have excellent potential for energy-efficient local cooling in confined geometries. For a given geometry, synthetic jet flows are mainly characterised by the Reynolds number and the ratio of stroke length to a geometric length scale. The flow field of an impinging synthetic jet and the corresponding surface heat transfer distribution are strongly dependent on the dimensionless stroke length, yet few studies have investigated the flow field dependence for a wide range of stroke lengths. Therefore, the aim of this paper is to identify the various flow regimes as a function of stroke length. The experimental approach combines high speed particle image velocimetry and single point hot wire anemometry, and investigates an 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

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“…Cooper et al (1992), Knowles (1996), Knowles and Myszko (1998), O'Donovan and Murray (2007), and Xu and Hangan (2008). O'Donovan and Murray (2007) revealed that higher H/D yields a much smaller axial velocity in the vicinity of impingement region and therefore has a smaller suppression effect on the development of the wall jet flow. Xu and Hangan (2008) reported that the decreased suppression of the axial component at higher H/D increases the position of the maximum and lower half of the velocity.…”

Section: Impinging Jetmentioning

confidence: 99%

“…Studies on the effects of the nozzle-to-plate distance, H, on impinging jet flow behaviours can be found in e.g. Cooper et al (1992), Knowles (1996), Knowles and Myszko (1998), O'Donovan and Murray (2007), and Xu and Hangan (2008). O'Donovan and Murray (2007) revealed that higher H/D yields a much smaller axial velocity in the vicinity of impingement region and therefore has a smaller suppression effect on the development of the wall jet flow.…”

Section: Impinging Jetmentioning

confidence: 99%

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Chen¹

2014

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A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO 2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept.In an impinging jet ventilation system, a high momentum of air jet is discharged downwards, strikes the floor and spreads over it, thus distributing the fresh air along the floor in the form of a very thin shear layer. This system retains advantages of mixing and stratification from conventional air distribution methods, while capable of overcoming their shortcomings.The aim of this thesis is to reach a thorough understanding of impinging jet ventilation for providing a good thermal environment for an office, by using Computational Fluid Dynamics (CFD) supported by detailed measurements. The full-field measurements were carried out in two test rooms located in a large enclosure giving relatively stable climate conditions. This study has been divided into three parts where the first focuses on validation of numerical investigations against measurements, the second addresses impacts of a number of design parameters on the impinging jet flow field and thermal comfort level, and the third compares ventilation performance of the impinging jet supply device with other air supply devices intended for mixing, wall confluent jets and displacement ventilation, under specific room conditions. In the first part, velocity and temperature distributions of the impinging jet flow field predicted by different turbulence models are compared with detailed measurements. Results from the non-isothermal validation studies show that the accuracy of the simulation results is to a great extent dependent on the complexity of the turbulence models, due to complicated flow phenomena related to jet impingement, such as recirculation, curvature and instability. The f v  2 turbulence model shows the best performance with measurements, which is slightly better than the SST k-ω model but much better than the RNG k-ε model. The difference is assumed to be essentially related to the magnitude of turbulent kinetic energy predicted in the vicinity of the stagnation region. Results from the isothermal study show that both the SST k-ω and RNG k-ε models predict similar wall jet behaviours of the impinging jet flow. IVIn the second part, three sets of parametric studies were carried out by using validated CFD models. The first parametric study shows that the geometry of the air supply system has the most significant impact on the flow field. The rectangular air supply device, especially the one with larger aspect ratio, provides a longer penetration distance to the room, which is suitable for industrial ventilation. The second study reveals that the interaction effect of cooling ceiling, heat sources ...

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Jet impingement heat transfer – Part I: Mean and root-mean-square heat transfer and velocity distributions

Cited by 196 publications

References 22 publications

Numerical Simulation of the Heat Transfer from a Heated Solid Wall to an Impinging Swirling Jet

Numerical Simulation of the Heat Transfer from a Heated Solid Wall to an Impinging Swirling Jet

Flow regime characterisation of an impinging axisymmetric synthetic jet

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

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