Heat transfer and hydrodynamics of an array of round impinging jets with one-sided exhaust of the spent air

Dyban, E. P.; Mazur, A. I.; Голованов, Виктор Петрович

doi:10.1016/0017-9310(80)90011-3

Cited by 11 publications

(2 citation statements)

References 7 publications

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“…It also included the assumptions of constant discharge coefficient and negligible effect of channel wall shear. A similar aproach was used by Dyban, et al [9] for arrays with no initial crossflow, including some attempt at accounting for channel friction effects. Martin [10] applied a similar model for a geometry in which the injected flow was in fact continuous in the streamwise direction; i.e., an array of slot nozzles in which the outlet flow was constrained to exit parallel to the slots.…”

Section: Flow Distribution Modelmentioning

confidence: 99%

Flow Distributions and Discharge Coefficient Effects for Jet Array Impingement With Initial Crossflow

Florschuetz

Isoda

1982

Volume 4: Heat Transfer; Electric Power

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Two-dimensional arrays of circular air jets impinging on a surface parallel to the jet orifice plate are considered. The jet flow, after impingement, is constrained to exit in a single direction along the channel formed by the jet orifice plate and the impingement surface. In addition to the crossflow which originates from the jets following impingement, an initial (independent) crossflow is present which approaches the array through an upstream extension of the channel. The configurations considered are intended to model the impingement cooled mid-chord region of gas turbine airfoils in cases where an initial crossflow is also present. Experimentally determined row-by-row streamwise distributions of the jet and crossflow velocities are presented for ratios of the initial crossflow rate to the total jet flow rate ranging from zero to unity. Comparisons are drawn between the measured flow distributions and a theoretical model which is presented. Effects of crossflow velocity and impingement surface proximity on jet hole discharge coefficients are also presented and discussed.

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Section: Flow Distribution Modelmentioning

confidence: 99%

Flow Distributions and Discharge Coefficient Effects for Jet Array Impingement With Initial Crossflow

Florschuetz

Isoda

1982

Volume 4: Heat Transfer; Electric Power

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“…Martin [3] reported with respect to the average Nu number for an array of round nozzles the optimum value for the open area factor as 0.0152 and the separation distance as 5.43 respectively irrespective of any other geometric parameters. Dyban et al [4] reported an optimum open area factor in the range of 0.007 to 0.018 with dependency on the nozzle to plate spacing with respect to the surface-average heat transfer coefficient. Metzger et al [5] observed that the maximum average Nu number can be achieved at optimum H/d=1 for S/d=1.67-6.67.…”

Section: Introductionmentioning

confidence: 99%

Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

Chitsazan¹,

Klepp²,

Glasmacher³

2021

IJHT

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Jet impingements enhance the heat and mass transfer rate in industrial drying machines. The designer should optimize the design parameters of industrial drying equipment to achieve maximum heat transfer rate. The heat transfer between multiple jets and a moving curved surface is more difficult to study due to the changing boundaries and the effect of surface curvature but is also very relevant in industrial drying applications. SST k-ω turbulence model is used to simulate a real geometry for industrial drying applications. The SST k-ω turbulence model succeeded with reasonable accuracy in reproducing the experimental results. The jet to surface distance, jet to jet spacing, jet inlet velocity, jet angle, and surface velocity are chosen as the design parameters. For the optimization of the impinging round jet, the average Nu number on the moving curved surface is set as the objective functions to be maximized. The SHERPA search algorithm is used to search for the optimal point from the weighted sum of all objectives method. One correlation is developed and validated for the average Nu number. It is found that the maximum average Nu number correlates with high values of jet inlet velocity (Vj), jet angle (θ) and jet to jet spacing (S/d) and low values of the jet to surface distance (H/d) and relative surface velocity (VR). The agreement in the prediction of the average Nu number between the numerical simulation and correlation is found to be reasonable and all the data points deviate from the correlation by less than 4%.

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Hydraulic drag and local heat transfer with blowing into the channel of an impact jet system

Dyban

Mazur

1987

Journal of Engineering Physics

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Heat transfer and hydrodynamics of an array of round impinging jets with one-sided exhaust of the spent air

Cited by 11 publications

References 7 publications

Flow Distributions and Discharge Coefficient Effects for Jet Array Impingement With Initial Crossflow

Flow Distributions and Discharge Coefficient Effects for Jet Array Impingement With Initial Crossflow

Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

Hydraulic drag and local heat transfer with blowing into the channel of an impact jet system

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