Near field vorticity distributions from a sharp-edged rectangular jet

Vouros, Alexandros; Panidis, Thrassos; Pollard, A.; Schwab, Rainer

doi:10.1016/j.ijheatfluidflow.2014.10.002

Cited by 24 publications

(18 citation statements)

References 39 publications

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“…Note that the relationship by Blevins [17] is considered for fully turbulent flow (Re > 3000) and infinite length of the slot. The experimental data by Vouros et al [7] (Re = 46000, AR = 10) and Deo et al [9] (Re = 3000, AR = 61) are also shown in figure 6. The present data reasonably agree (for x/(2B) 10) with these results [7,9], although the operation parameters of [7] and [9] were quite different.…”

Section: Resultsmentioning

confidence: 77%

“…This behavior is typical for 2D turbulent jets, the initially uniform jet creates two off axis peaks in proximity of the edges of the long size of the slot (here near the edges of the nozzle at z = +L s /2 and z = -L s /2), see e.g. Vouros et al [7]. In the present experiment the behavior is probably also supported by the confined 3D geometry of the cavity (namely, the cylindrical cavity with an axial inlet and a radial outlet) and by the short nozzle exit channel.…”

Section: Resultsmentioning

confidence: 78%

“…The resulting velocity profiles are known as saddle-back profiles of CJs (see e.g. Vouros et al [7]). Note that this effect was identified for SJs too -see Smith and Glezer [10].…”

Section: Resultsmentioning

confidence: 99%

“…Gutmark and Wygnanski [1], Everitt and Robins [2], Tsuchiya et al [3]), spatial developement of the velocity profile and the pressure distribution of the jet (Abramovich [4]), coherent structures in plane jets (e.g. Thomas and Goldschmidt [5]), axis-switching of the jet (Zaman [6]), saddle-back velocity profiles (Vouros et al [7]), behavior of the jets at low Reynolds numbers (Sato and Sakao [8]) or the influence of an aspect ratio of the nozzle (Deo et al [9]). …”

Section: Introductionmentioning

confidence: 99%

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PIV and LIF study of slot continuous jet at low Reynolds number

Broučková

Hsu

Wang

et al. 2016

EPJ Web of Conferences

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Abstract. This study deals with a continuous jet issuing from a small narrow slot with a width of 0.36 mm. The experimental arrangement is based on the piezoelectric synthetic jet actuator studied previously for easy comparisons. The working fluid is water at room temperature. The experiments were performed using methods of particle image velocimetry (PIV) and flow visualization (laser induced fluorescence, LIF). The time-mean volume flux through the exit nozzle was quantified using precise scales. The mean velocity and the Reynolds number were evaluated as U m = 0.12 m/s and Re = 90, respectively. The results of LIF and PIV techniques revealed the three-dimensional character of the flow field, namely the saddle-shape velocity profiles. This behavior is typical for steady jets from a rectangular nozzle. The obtained results were compared with previous measurements of the synthetic jet issuing from the same cavity and the slot nozzle.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 78%

“…The resulting velocity profiles are known as saddle-back profiles of CJs (see e.g. Vouros et al [7]). Note that this effect was identified for SJs too -see Smith and Glezer [10].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PIV and LIF study of slot continuous jet at low Reynolds number

Broučková

Hsu

Wang

et al. 2016

EPJ Web of Conferences

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“…The fluid entrainments are not confined at the plume ends, therefore the plume volume flux is enhanced at the ends. 201 It is worthy of notice here that this mechanism is well know from rectangular fluid jets, where this process basically changes a two-dimensional (plane) jet flow causing a three-dimensional flow character with a saddle-back velocity profile -see Vouros et al [6] and Brouþková et al [3].…”

Section: Velocity Flow Field: Piv Experimentsmentioning

confidence: 99%

PIV and LIF study of flow and thermal fields of twine plumes in water

Broučková

Trávníček

2017

EPJ Web Conf.

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Abstract. Flow and thermal fields of a pair of plane plumes in water are investigated by means of PIV and LIF experiments. The plumes are generated from thermal line sources, which are made out of electrically heated cylinders with a diameter of D = 1.21 mm. A cylinder-to-cylinder distance was 17.9 D. Either continuous or pulsating heating were used with the same heating input power. Because the cylinder-tocylinder distance is moderately small, deflections of plumes from a vertical direction occur and the plumes are inclined together. This behavior is caused by a confined entrainment from a space between the both plumes. For a continuous heating, low frequency oscillations were identified and the natural frequency was evaluated as 0.5 Hz. Based on this finding, pulsating heating was used at the subharmonic frequency of 0.25 Hz. The maximum time-mean velocity magnitude at the continuous and pulsating heating were commensurable, approximately 0.007 m/s. On the other hand, pulsating heating achieves by 36 % higher velocity peaks. A very strong velocity oscillations were generated by pulsating heating at the distance approximately 8.3 D above the cylinders, where the velocity maxima oscillate along the time-mean value of 0.0057 m/s from -30% to +70 %. Temperature fields reasonably agree with this findings, despite a relatively fast equalization of the temperature field was concluded. The results demonstrate enhancement effects of pulsations in flow/thermal fields.

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