Heat transfer to impinging round jets with triangular tabs

Gao, Nan; Sun, HongGuang; Ewing, D.

doi:10.1016/s0017-9310(03)00034-6

Cited by 136 publications

(54 citation statements)

References 19 publications

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“…The target plate thickness in the present work is 1 mm whereas Lyttle and Webb [6] have used a stainless steel foil of thickness 0.051 mm. Results of the present work are in good agreement with that of Gao et al [7] for the entire range of r/D. In the stagnation region, it also compares well with the heat transfer results of Baughn and Shimizu [4], but is higher in the region away from the stagnation point.…”

Section: Heat Transfer Distribution On Smooth Surfacesupporting

confidence: 92%

“…These differences may be attributed to the differences in the boundary condition and also the technique employed in capturing the local temperature distribution. Lytle and Webb [6] and Gao et al [7] employ thin metal foil technique for a constant heat flux boundary condition. Lee et al [8] and Yan (in Ref.…”

Section: Heat Transfer Distribution On Smooth Surfacementioning

confidence: 99%

“…Lyttle and Webb [6] have studied the effect of very low nozzle plate spacing (Z/D < 1) on the local heat transfer distribution on a flat plate impinged by a circular air jet and found that in the acceleration range of the nozzle plate spacing (Z/D < 0.25), maximum Nusselt number shifts from the stagnation point to the point of secondary peak with the effect being more pronounced at higher Reynolds number. Gao et al [7] have studied the effect of triangular tabs put at the exit of the nozzle. Lee et al [8] have studied effect of nozzle diameter (1.36, 2.16, and 3.40 cm) on impinging jet heat transfer and fluid flow.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer augmentation between impinging circular air jet and flat plate using finned surfaces and vortex generators

Nakod

Prabhu

Vedula

2008

Experimental Thermal and Fluid Science

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Section: Heat Transfer Distribution On Smooth Surfacesupporting

confidence: 92%

Section: Heat Transfer Distribution On Smooth Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat transfer augmentation between impinging circular air jet and flat plate using finned surfaces and vortex generators

Nakod

Prabhu

Vedula

2008

Experimental Thermal and Fluid Science

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“…One decade after the observation of Gardon and Akrifat [15], Popiel and Boguslawski [17] claimed that nozzle exit configuration was the most important factor affecting the stagnation point heat transfer. Despite these first very significant indications, there are only a few studies dedicated to heat/mass transfer enhancement using active [18][19][20][21] or passive jet control [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Gao et al [24] were the first authors to introduce passive control of an impinging jet for heat transfer enhancement using vortex generators (triangular tabs). Heat transfer measurements were performed for impinging round pipe jets with a Reynolds number of 23 000 and nozzle-to plate distances ranging from 1D to 10D where, D is the nozzle diameter for a round jet.…”

Section: Introductionmentioning

confidence: 99%

Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

et al. 2015

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To cite this version:Kodjovi Sodjavi, Brice Montagné, Pierre Bragança, Amina Meslem, Florin Bode, et al.. Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles. Meccanica, Springer Verlag, 2015, pp.1-21. 10 AbstractIt is well known that the transfer of heat, mass and momentum to a wall by an impinging jet is partially linked to the way in which jet generation is realized. The organization of the vortices at the jet exit depends on the upstream conditions and on the geometry of the nozzle. Particle Image Velocimetry (PIV) and electrodiffusion techniques were used to investigate the characteristics of different impinging jets and the resulting wall shear rates and mass transfer. Two Cross-Shaped orifice jets, one produced by a plane orifice nozzle (i.e. a Cross-Shaped Orifice made on a flat Plate, CO/P) and the second by a hemispherical orifice nozzle (i.e. a Cross-Shaped Orifice made on a Hemisphere, CO/H), were compared to a reference round jet produced by a convergent nozzle. The distance between the jet exit and the target wall was equal to two nozzle equivalent diameters (De), based on the free orifice area. The Reynolds number, based on De and on the exit bulk-velocity, was 5620 for each flow. PIV measurements give an overall view of the flow characteristics in their free and wall regions. The switching-over phenomena observed in the CO/P nozzle case, and already described in the literature with similar nozzles, did not occur in the jet from the CO/H nozzle. Electrodiffusion measurements showed differences in the shape and level of radial distribution of the wall shear rates and mass transfer. One of the most important observations is the large difference in wall shear stress between the three jets. For the same exit bulk-velocity, the maximum wall shear rate in the CO/P and CO/H nozzle jets was almost two and three times higher, respectively, than that of the reference convergent jet. This higher wall shear rate is accompanied

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Spatially Resolved Dynamically Reconfigurable Multilevel Control of Thermal Emission

et al. 2019

Laser & Photonics Reviews

112

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Spatially resolved dynamically reconfigurable control of thermal emission has comprehensive implications for fundamental science and technological applications, such as thermal camouflage and adaptive radiative heating/cooling. Materials and systems that can spatially control thermal emission with dynamic reconfigurability, simple manufacturability, and a large dynamic range have not been explored, so far. Here, a spatially resolved thermal emission control platform consisting of three components (a material with phase transition hysteresis, a thermal photonic device with a field‐optimized planarized structure, and an optically controllable patterning system) is built and validated. This platform presents excellent merits such as spatially resolved control of thermal emission, multilevel (up to nine levels) emission control with a large dynamic range of the emissivity modulation (0.19 for the insulating phase and 0.91 for the metallic phase) over a broad bandwidth (8–14 µm), and robust reconfigurability. The results demonstrate potential applications in the field of thermal photonics for information and energy harvesting.

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Heat transfer to impinging round jets with triangular tabs

Cited by 136 publications

References 19 publications

Heat transfer augmentation between impinging circular air jet and flat plate using finned surfaces and vortex generators

Heat transfer augmentation between impinging circular air jet and flat plate using finned surfaces and vortex generators

Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

Spatially Resolved Dynamically Reconfigurable Multilevel Control of Thermal Emission

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