Flow transitions and heat transfer in open block tandem channels

Valle, Marcelo del; Carrasco, Alfredo; Guzmán, Amador M.

doi:10.1109/itherm.2002.1012459

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…For an aspect ratio of r = 0.375, the transition scenario from a laminar to a quasi-periodic flow occurs by two successive Hopf bifurcations, B 1 and B 2 at Reynolds numbers Rec 1 and Rec 2 , which are lower than the critical Reynolds number for a Poisueille plane channel flow. The transition scenario developed in this asymmetric wavy channel is very much like the Ruelle-Takens-Newhouse (RTN) scenario to chaos, developed in converging-diverging (symmetric wavy) channels and grooved channels, reported by Guzman et al [15,[24][25][26] and Wang and Chen [20]. The transition scenarios for the aspect ratios r = 0.25 and 0.5 are characterized by just one flow bifurcation to a time periodic flow.…”

Section: Laminar and Transitional Flow Regimes With A Spatially Periosupporting

confidence: 51%

Heat transfer enhancement by flow bifurcations in asymmetric wavy wall channels

Guzmán

Cardenas

Urzua

et al. 2009

International Journal of Heat and Mass Transfer

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Section: Laminar and Transitional Flow Regimes With A Spatially Periosupporting

confidence: 51%

Heat transfer enhancement by flow bifurcations in asymmetric wavy wall channels

Guzmán

Cardenas

Urzua

et al. 2009

International Journal of Heat and Mass Transfer

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Flow and heat transfer characteristics in micro and mini communicating pressure driven channel flows by numerical simulations

Guzmán

Beiza

Díaz

et al. 2013

International Journal of Heat and Mass Transfer

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Heat Transfer Enhancement Due to Frequency Doubling and Ruelle–Takens–Newhouse Transition Scenarios in Symmetric Wavy Channels

Guzmán

Hormazabal

Aracena

2009

Journal of Heat Transfer

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Heat transfer enhancement characteristics, through a transition scenario of flow bifurcations in symmetric wavy wall channels, are investigated by direct numerical simulations of the mass, momentum, and energy equations using spectral element methods. Flow bifurcations, transition scenarios, and heat transfer characteristics are determined by increasing the Reynolds numbers from a laminar to a transitional flow for the geometrical aspect ratios r=0.125 and r=0.375. The numerical results demonstrate that the transition scenario to transitional flow regimes depends on the aspect ratio. For r=0.375, the transition scenario is characterized by one Hopf flow bifurcation in a frequency-doubling transition scenario, where further increases in the Reynolds number always lead to periodic flows; whereas, for r=0.125, the transition scenario is characterized by a first Hopf flow bifurcation from a laminar to a time-dependent periodic flow and a second Hopf flow bifurcation from a periodic to a quasiperiodic flow. For r=0.125, the flow bifurcation scenario is similar to the Ruelle–Takens–Newhouse (RTN) transition scenario to Eulerian chaos observed in asymmetric wavy and grooved channels. The periodic and quasiperiodic flows are characterized by fundamental frequencies ω1, and ω1 and ω2, respectively. For the aspect ratio r=0.375, the Nusselt number increases slightly as the Reynolds number increases in the laminar regime until it reaches a critical Reynolds number of Rec≈126. As the flow becomes periodic, and then quasiperiodic, the Nusselt number continuously increases with respect to the laminar regime, up to a factor of 4, which represents a significant heat transfer enhancement due to a better flow mixing.

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Flow transitions and heat transfer in open block tandem channels

Cited by 3 publications

References 18 publications

Heat transfer enhancement by flow bifurcations in asymmetric wavy wall channels

Heat transfer enhancement by flow bifurcations in asymmetric wavy wall channels

Flow and heat transfer characteristics in micro and mini communicating pressure driven channel flows by numerical simulations

Heat Transfer Enhancement Due to Frequency Doubling and Ruelle–Takens–Newhouse Transition Scenarios in Symmetric Wavy Channels

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