Sinusoidal wavy channels with Taylor-Goertler vortices

Gschwind, Peter; Regele, A.; Kottke, Volker

doi:10.1016/0894-1777(95)00056-r

Cited by 80 publications

(32 citation statements)

References 6 publications

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“…At Re = 300, the centrifugal instability leads to the formation of counter-rotating streamwise vortices along the whole sinusoidal wavy channel (Gschwind et al 1995). Gschwind et al (1995) also established a diagram that proves the existence of a critical or neutral curve in the stability diagram for the transition between laminar and turbulent flow.…”

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confidence: 96%

Visualization of pre-set vortices in boundary layer flow over wavy surface in rectangular channel

Budiman

Mitsudharmadi

Bouremel

et al. 2014

J Vis

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Smoke-wire flow visualization is used to study the development of pre-set counter-rotating streamwise vortices in boundary layer flow over a wavy surface in a rectangular channel. The formation of the vortices is indicated by the vortical structures on the cross-sectional plane normal to the wavy surface. To obtain uniform spanwise vortex wavelength which will result in uniform vortex size, two types of spanwise disturbances were used: a series of perturbation wires placed prior and normal to the leading edge of the wavy surface, and a jagged pattern in the form of uniform triangles cut at the leading edge. These perturbation wires and jagged pattern induce low-velocity streaks that result in the formation of counterrotating streamwise vortices that evolve downstream to form the mushroom-like structures on the crosssectional plane of the flow. The evolution of the most amplified disturbances can be attributed to the formation of these mushroom-like structures. It is also shown that the size of the mushroom-like structures depends on the channel entrance geometry, Reynolds number, and the channel gap.

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confidence: 96%

Visualization of pre-set vortices in boundary layer flow over wavy surface in rectangular channel

Budiman

Mitsudharmadi

Bouremel

et al. 2014

J Vis

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“…As seen in Fig. 3-a For the present cooling application, the flow mechanism that triggers the overall heat transfer enhancements in the wavy channels [9][10][11][12][13]15] is induced by the traversing flow over the undulant surface through the top open boundary, which remains weak and is geometry and Re dependent. It is worth noting that, for the present application, the main coolant stream flows along the undulant surface.…”

Section: Resultsmentioning

confidence: 99%

“…At low Reynolds numbers tested, the flow entrainment can be absent and the leaking flow from the top open boundary is also weak. When the strength of the cross-stream traversing the wavy surface remains weak, the centrifugal instability that leads to the development of longitudinal vortices are not triggered [15]. Instead, the vortical flows trapping between the pair of wavy fins can cause heat transfer impediments from the flat fin scenarios.…”

Section: Resultsmentioning

confidence: 99%

Forced Heat Convection of Wavy Fin Channel

Yang

Chiang

Chang

et al. 2008

JTST

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This experimental study measures the detailed heat transfer distributions over the wavy fin channel with twin flow exits that simulates an elongated flow passage in a fin array. Heat transfer results acquired from the wavy and flat fin channels are compared. Impacts of Reynolds number (Re) and the undulant surface on heat transfer distributions over the wavy fin surface in the Re range of 500-11000 are examined. The spatially averaged Nusselt numbers ( Nu ) over the flat and wavy fin surfaces are analyzed with the empirical Nu correlations derived. Within the Re range tested, the lack of traversing flow momentum over the undulant fin surface prohibits the overall heat transfer elevations from the flat fin levels. Increments of cooling power available from the wavy fin surface due to the surface enlargement only develop at the test conditions of Re>6000 for the present test configuration.

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“…Sinusoidal wavy surfaces can influence the heat transfer in plate heat exchangers. Beside that flow instabilities ± longitudinal vortices ± can arise depending on the geometrical and flow dynamical parameters [5]. Fig.…”

Section: Applicationsmentioning

confidence: 99%