Experimental and numerical investigation of geometry effects on multiple impinging air jets

Çalışkan, Sinan; Baskaya, Senol; Çalışır, Tamer

doi:10.1016/j.ijheatmasstransfer.2014.04.005

Cited by 102 publications

(29 citation statements)

References 35 publications

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“…The gas properties in (14) are evaluated at the arithmetic mean temperature of the thermal boundary layer [26]. The relative saturation, RS, is determined from…”

Section: Theorymentioning

confidence: 99%

“…Olsson et al [13] simulated flow around two and three jets with -SST turbulence model and results display that both distance and opening between the jets are important for the heat transfer rates in the stagnation zone. Elliptical and rectangular impingement jets were examined both experimentally and numerically by Caliskan et al [14], yielding an enhanced heat transfer coefficients for elliptical jets. The detailed study, furthermore, discloses the formation of upward flow between two adjacent jets.…”

Section: Introductionmentioning

confidence: 99%

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Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Ljung

Andersson

et al. 2017

International Journal of Chemical Engineering

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Impinging jets are often used in industry to dry, cool, or heat items. In this work, a two-dimensional Computational Fluid Dynamics model is created to model an impingement jet dryer with a total of 9 pairs of nozzles that dries sheets of metal. Different methods to model the evaporation rate are studied, as well as the influence of recirculating the outlet air. For the studied conditions, the simulations show that the difference in evaporation rate between single- and two-component treatment of moist air is only around 5%, hence indicating that drying can be predicted with a simplified model where vapor is included as a nonreacting scalar. Furthermore, the humidity of the inlet air, as determined from the degree of recirculating outlet air, has a strong effect on the water evaporation rate. Results show that the metal sheet is dry at the exit if 85% of the air is recirculated, while approximately only 60% of the water has evaporated at a recirculation of 92,5%.

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“…The gas properties in (14) are evaluated at the arithmetic mean temperature of the thermal boundary layer [26]. The relative saturation, RS, is determined from…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Ljung

Andersson

et al. 2017

International Journal of Chemical Engineering

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“…Many experimental and numerical investigations have been carried out for conventional jets impinging upon the surface to find their fluid and heat flow characteristics. Various types of geometries of the jet which impinged the surface, e.g., single round jet [3][4][5][6], twin slot jets [7], single row of jets [8] as well as elliptic, circular and rectangular jet arrays [9] were considered. Influences of various geometrical parameters, e.g., the ratio of the jet height to the jet diameter [3,4,6,7,9], the inclination angle of the jet to the impingement surface [7], the ratio of the jet to the jet separation distance [7,8] and the ratio of the cross-flow velocity to the jet velocity [8] were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…from 1000 up to 100000. Different ways of turbulence modelling were tested, e.g., standard [6] and low Reynolds number k-e models [6,9], RNG k-e model [6,7], realizable k-e model [6], standard k-w model [6], SST k-w model [6][7][8], RANS k-w model of Wilcox [3], hybrid RANS/LES models with different subgrid scale eddy viscosity in the LES mode [3,4] and direct numerical simulation [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of a cooling of a hot plate by an array of microjets

Łapka

Cieplniński

2019

E3S Web Conf.

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In this paper heat transfer during impingement of an array of 8×8 microjets on a hot surface was investigated. The influence of a ratio of a distance between a nozzle and hot plate (H/d) and microjet diameter-based Reynolds number (Red) on the temperature and heat transfer coefficient (HTC) on the hot plate were numerically studied. The numerical model which was based on the steady-state compressible Navier-Stokes equations and SST k-ω turbulence model was developed and applied for the analysis. During simulations the ratio of the distance between the nozzle and hot plate to the microjet diameter was H/d = 3.125, 25 and 50, while the microjet diameter-based Reynolds number was equal to Red = 690, 1100 and 1510. The ratio of the microjet pitch to the microjet diameter was s/d = 31.25. It was found that both the H/d ratio and Red significantly influenced flow patterns in the gap between the nozzle and hot plate as well as the temperature and HTC on the surface of the hot plate. With increase of the H/d ratio a more uniform distributions of the plate temperature and HTC were observed, while the rise in the Red intensified heat transfer on the hot plate.

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“…They noticed that the s D appears to be the major factor affecting the non-uniformity of heat transfer, while the H D is a minor factor. The effect of jet geometry on the flow and the heat transfer characteristics was investigated experimentally and numerically for elliptic and rectangular impinging M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT jet arrays by Caliskan et al (2014). Velocity measurements were performed with a Laser-Doppler Anemometry system and detailed heat transfer measurements were obtained using thermal infrared camera.…”

Section: Introductionmentioning

confidence: 99%

Fluid flow and convective heat transfer of combined swirling and straight impinging jet arrays

Wannassi

Monnoyer

2015

Applied Thermal Engineering

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Experimental and numerical investigation of geometry effects on multiple impinging air jets

Cited by 102 publications

References 35 publications

Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Numerical analysis of a cooling of a hot plate by an array of microjets

Fluid flow and convective heat transfer of combined swirling and straight impinging jet arrays

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