An experimental study of flow and heat transfer in sinusoidal wavy passages

Rush, T.a.; Newell, T.A.; Jacobi, Anthony M.

doi:10.1016/s0017-9310(98)00264-6

Cited by 283 publications

(108 citation statements)

References 22 publications

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“…In the past, a large body of numerical and experimental studies investigated the heat transfer enhancement by introducing the undulant heat transfer surface. A selection of previous works involving wavy walls [9][10][11][12][13] demonstrated that the periodic changes of pressure gradient and of streamwise curvature generated the flow separation bubble near the furrow region of the wavy wall with a separated shear layer developed slightly above the separation bubble which elevated the turbulence intensity [9]. The recirculation zones occupied by these separation bubbles interacted with the channel core fluid through the shear-layer instability that augmented the macroscopic mixing for further heat transfer enhancement [10].…”

Section: Introductionmentioning

confidence: 99%

“…A selection of previous works involving wavy walls [9][10][11][12][13] demonstrated that the periodic changes of pressure gradient and of streamwise curvature generated the flow separation bubble near the furrow region of the wavy wall with a separated shear layer developed slightly above the separation bubble which elevated the turbulence intensity [9]. The recirculation zones occupied by these separation bubbles interacted with the channel core fluid through the shear-layer instability that augmented the macroscopic mixing for further heat transfer enhancement [10]. The coolant streams traversed the wavy surfaces so that the fluid mechanisms leading to heat transfer augmentations [9][10][11][12][13] were produced.…”

Section: Introductionmentioning

confidence: 99%

“…The recirculation zones occupied by these separation bubbles interacted with the channel core fluid through the shear-layer instability that augmented the macroscopic mixing for further heat transfer enhancement [10]. The coolant streams traversed the wavy surfaces so that the fluid mechanisms leading to heat transfer augmentations [9][10][11][12][13] were produced. With the adoption of wavy fins for the cooling system as exemplified by Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forced Heat Convection of Wavy Fin Channel

Yang

Chiang

Chang

et al. 2008

JTST

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“…Rush et al [2] investigated experimentally the fluid flow and heat transfer features in sinusoidal wavy channels. Laminar forced convection in the entry region of a wavy-channel was solved numerically by Mohamed et al [3] approach.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer Enhancement and Entropy Generation of Laminar Flow of Water through a Wavy Channel

Bhattacharyya¹,

Chattopadhyay²,

Swami³

et al. 2016

IJHT

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Using computational analysis, convective heat transfer enhancement and entropy generation of laminar flows through wavy channels was examined. A three-dimensional geometry was used for simulation. The simulation was performed using non dimensional governing equations for a steady laminar flow. The flow is both thermally and hydrodynamically developing while the channel walls are kept at a constant temperature. The computations were conducted with Reynolds number ranging from 100 to 2000 using water (Pr = 7.0) as the working fluid. The numerical simulation was carried out by using two different diameter ratio (W = L/D) and three different wave ratio (Y = P/D) to reach the optimal geometry with the maximum performance evaluation criterion. The results showed that the heat transfer performance in wavy channel was enhanced than a typical circular channel. The pressure drop also increased in case of wavy channel and smaller wave ratio has more friction penalty. Generally, the heat transfer performance of wavy channel has an enhanced heat transfer performance because of the thermal boundary layer disturbance and block of longitudinal heat transfer.

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“…Rushet et al [10] experimentally performed the study on the heat transfer and flow characteristics under sinusoidal wavy laminar flows through a channel. Water tunnel was used to study the flow field using visualization methods while wind tunnel has been used to conduct heat transfer experiments in the range of Re from 100 to 1000.…”

Section: Introductionmentioning

confidence: 99%