Enhancement of impinging jet heat transfer by making use of mechano–fluid interactive flow oscillation

Haneda, Yoshiaki; Tsuchiya, Y.; Nakabe, Kazuyoshi; Suzuki, Kenjiro

doi:10.1016/s0142-727x(97)10016-9

Cited by 23 publications

(7 citation statements)

References 17 publications

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“…The Nusselt number distributions in the outer region, y / h t r2, were observed to have some asymmetry, which could be caused by the geometrical arrangement of the test section. numbers obtained by the present data is almost the same as that previously obtained in the case where the frequencies of cylinder oscillation are relatively higher [14].…”

Section: Heat Transfer Characteristicssupporting

confidence: 92%

“…The maximum velocity, V cmax , of the inserted cylinder was calculated as V cmax 2SfA. The frequency of the oscillating cylinder, f, was approximately 7 times lower than the previous result [14], although the cylinder amplitude became 2 to 15 times larger than the previous result due to the spring performance being different from the previous one. Accordingly, the heat transfer characteristics described in the following section will be found to also differ from the results published in Ref.…”

Section: Flow Characteristicsmentioning

confidence: 59%

“…A steel plate spring, 2.5 mm wide and 0.8 mm thick, embedded in the center of the cylinder was supported laterally against the jet direction in a cantilever fashion. The distance between the cylinder and the target plate, C, was equal to 6, 5, and 4 mm in the respective case where the cylinder diameter, D, was 4, 6, and 8 mm, corresponding to a constant distance between the cylinder center and the target surface at 8 mm [14]. The jet exit velocity, U 0 , for the velocity and heat transfer measurements was set to be 10 The displacement of the oscillating cylinder and the velocity near the target surface were measured simultaneously with a strain gauge installed on the spring surface and an I-type hot-wire probe positioned at a distance of 2 mm above the target surface.…”

Section: Introductionmentioning

confidence: 99%

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Flow field and heat transfer of a two‐dimensional impinging jet disturbed by an elastically suspended circular cylinder

Haneda

Tsuchiya

Kurasawa

et al. 2001

Heat Trans. Asian Res.

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The flow field around a circular cylinder elastically suspended with a cantilever‐type plate spring in the jet impingement region was visualized to investigate the mechanism of the impingement heat transfer. The impingement distance H was kept constant at 3 or 5 times as large as the jet slot width, h = 15 mm.The Reynolds number was fixed at 10,000, or 5000 in the case of flow visualization. The self‐induced periodic swing motion of the cylinder across the jet axis was caused by the interaction between the jet and the elastically suspended cylinder. It was found that this swing motion has direct effects on the flow and heat transfer characteristics of the stagnation region. The ensemble‐averaged values of the flow velocity and its fluctuations depended on the cylinder diameter and the impingement distance. The local Nusselt number in the case of H/h = 3 with the oscillating cylinder of the smallest diameter D = 4 mm was increased to 1.15 times as large as that without the cylinder. The interesting patterns of the intermittency function defined with a certain threshold level of turbulence intensity were obtained under the above experimental conditions. © 2001 Scripta Technica, Heat Trans Asian Res, 30(4): 313–330, 2001

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Section: Heat Transfer Characteristicssupporting

confidence: 92%

Section: Flow Characteristicsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Flow field and heat transfer of a two‐dimensional impinging jet disturbed by an elastically suspended circular cylinder

Haneda

Tsuchiya

Kurasawa

et al. 2001

Heat Trans. Asian Res.

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“…The difference in heat transfer enhancement ratio seems to depend on the difference in the oscillation frequency of the swing-type flow when we take the visualization result of the flow into consideration. Haneda et al [13,14], Fu et al [15][16][17], Lin et al [18], and Chaniotis et al [19] have reported impinging jet heat transfer enhanced owing to oscillating flow. The /ℎ values that obtained maxima of Nu /Nu for each /ℎ value are different from the /ℎ values that obtained maxima of / .…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Impinging Jet Heat Transfer Using Two Parallel Confining Plates Mounted near Rectangular Nozzle Exit

et al. 2014

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Impinging jet heat transfer on a target plate was enhanced by using two parallel confining plates mounted between a rectangular nozzle end plate and a jet target plate. The target plate was set equal to 2, 3, 4, and 5 times the jet exit width, h, and the gap ratio of two parallel confining plates, W/h, were changed from 2.7 to 8.0 only by impinging length H=5h and from 2.7 to 6.7 by H≠5h. Two confining parallel plates mounted near the jet exit produced swing-type flow under some conditions. As a result, the maximum Nusselt number attained around the stagnation point was augmented by about 50% compared to the one for normal impinging jet without the two parallel plates and then spatial mean Nusselt number was increased by about 40%.

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“…Pulsations in the imposed inlet velocities of a channel or enclosure have also been shown to enhance the global heat transfer, as opposed to the localized cooling of the method under study [19][20][21][22][23][24]. Research has also demonstrated that the use of flow-induced vibrations in forced convection promotes better fluid mixing and heat transfer but still requires some means of driving the flow (i.e., a fan) [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Unconventional Cooling of Electronic Components by Vibrating Plates at Close Proximity

Florio

Harnoy

2005

Numerical Heat Transfer, Part A: Applications

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In this study, an unconventional approach to electronic cooling is described, and its feasibility is investigated. This approach makes use of the transverse oscillations of a short plate placed in close proximity to the electronic component to provide for focused and localized cooling. This method can be applied for intermediate cooling rates, above those of natural convection, in order to extend the no-fan regime.To estimate the cooling potential, a numerical simulation of the temperature field in a channel formed by an oscillating surface and a fixed constant heat flux surface is performed. The results show that transverse oscillations have the potential for significant cooling enhancement compared to pure natural convection. The cooling effect is found to increase with the oscillation amplitude and channel length to mean width ratio and, to a lesser extent, with the oscillation frequency.

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Enhancement of impinging jet heat transfer by making use of mechano–fluid interactive flow oscillation

Cited by 23 publications

References 17 publications

Flow field and heat transfer of a two‐dimensional impinging jet disturbed by an elastically suspended circular cylinder

Flow field and heat transfer of a two‐dimensional impinging jet disturbed by an elastically suspended circular cylinder

Enhancement of Impinging Jet Heat Transfer Using Two Parallel Confining Plates Mounted near Rectangular Nozzle Exit

Feasibility Study of Unconventional Cooling of Electronic Components by Vibrating Plates at Close Proximity

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