Augmentation of Turbulent Heat Transfer with a Vortex Generator Attached to a LEBU Plate.

Inaoka, Kyoji; Suzuki, Kazuyuki; Suzuki, Hiroshi; Hagiwara, Yoshimichi; Suzuki, Kenjiro

doi:10.1299/kikaib.58.2241

Cited by 2 publications

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“…These features of h are similar to the counterpart for the turbulent boundary layer. Therefore, the chief mechanism of heat transfer enhancement is supposed to be the same as in the turbulent boundary layer [5], i.e., higher velocity, lower temperature, and low turbulence fluid from the free stream to the near-wall region are produced by the downwash fluid motion accompanied by a longitudinal vortex and have a predominant effect on heat transfer characteristics. Figure 6 compares the results of L2 and L2′.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…As a first step, heat transfer experiments were previously made for the cases where a LEBU plate, which is effective in reducing the wall skin friction and has small form drag, and a body composed of a vortex generator and a LEBU plate were inserted into a turbulent boundary layer [4,5]. It was found that heat transfer and skin friction were suppressed by the LEBU plate.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer enhancement of turbulent duct flow by vortex generators attached to a large eddy break‐up manipulator

Inaoka

Uezu

Suzuki

1999

Heat Trans. Asian Res.

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An experimental study was conducted to investigate the characteristics of wall heat transfer and momentum loss for turbulent duct flow disturbed by insertion of a complicated body composed of a Large Eddy Break-Up (LEBU) plate and winglettype vortex generators. It was found that the LEBU plate reduces the wall heat transfer in the region downstream of the insertion position and that this suppression of heat transfer could be recovered by attaching vortex generators to the LEBU plate, i.e., conspicuous heat transfer enhancement was achieved over a large streamwise distance. The spatial distribution of the heat transfer coefficient obtained shows the same features as that observed in a previous study of a flat plate turbulent boundary layer. Therefore, the flow and thermal field structure of the turbulent duct flow downstream of the inserted body should be basically the same as those in the same region of the turbulent boundary layer. The effect of a notch, open in the LEBU plate behind the vortex generator, on heat transfer and pressure drop was also examined. The notch simulates the hole of the LEBU plate to be produced in a practical application when a vortex generator is produced by punching from the original plain LEBU plate. It was found that a vortex generator with an open notch works best in augmenting the wall heat transfer and also in suppressing the increase of momentum loss.

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Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%