Non-intrusive measurements of near-wall fluid flow and surface heat transfer in a serpentine passage

Liou, Tong‐Miin; Chen, C.-C.; Tzeng, Yaw-Yng; Tsai, T.-W.

doi:10.1016/s0017-9310(99)00336-1

Cited by 35 publications

(14 citation statements)

References 13 publications

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“…Flows around simple bends in a plane also exhibit Dean vortices and the attendant benefits to heat transfer (Liou et al 2000;Chintada et al 1999), and this provides an efficient means for the enhancement of heat transfer in low Re flows such as might be encountered in microchannel heat exchangers (Rosaguti et al 2005a, b).…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulics of square-section microchannels following a serpentine path

Geyer

Rosaguti

Fletcher

et al. 2005

Microfluid Nanofluid

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Section: Introductionmentioning

confidence: 99%

Thermohydraulics of square-section microchannels following a serpentine path

Geyer

Rosaguti

Fletcher

et al. 2005

Microfluid Nanofluid

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“…Extensive studies have been conducted on the heat transfer enhancement using turbulators in simulated heat exchangers, turbine blades and so on [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The turbulator usually generates high turbulence vortical motion in uniform flows, which may change the mean velocity fields, modify the flow turbulence properties and the structures of the near wall layers in the velocity boundary layer.…”

Section: Introductionmentioning

confidence: 99%

“…Their studies showed that various ridge shapes have comparable thermal performance and the composite-ribbed performed best in their ribbed configurations. Liou et al [14] also studied the effect of divider thickness on the local heat transfer distributions. Their results showed that the direction and strength of the secondary flow are the most important fluid dynamic factors affecting the heat transfer distributions, followed by the convective mean velocity and then the turbulent kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Flow structures and heat transfer characteristics in fan flows with and without delta-wing vortex generators

Chen

Shu

2004

Experimental Thermal and Fluid Science

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Effects of an external delta-wing vortex generator on the flow and heat transfer characteristics in fan flows and uniform flows were experimentally investigated and compared. A heated plate, installed on the bottom wall of a duct, was used as the heat transfer surface. Three-component mean and fluctuating velocity measurements were conducted using a laser Doppler velocimetry to characterize the flow structures and to obtain the near-wall flow parameters, including the axial mean velocity, axial vorticity and turbulent kinetic energy. Temperatures on the heat transfer surface were measured using thermocouples to obtain the Nusselt numbers. Results show that the external delta-wing vortex generator in fan flows has little overall effect on the near-wall averaged axial mean velocity and axial vorticity, but increases the turbulent kinetic energy, in the investigated X/D ranges. The increase in the turbulent kinetic energy by the delta-wing has little effect on heat transfer in the inherently vortical fan flows.Consequently, the delta-wing vortex generator in fan flows has little effect on the heat transfer augmentation.

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“…Therefore, understanding of the unsteady heat transfer in sharp 180°bends is important. Heat and Fluid Flow 24 (2003) [67][68][69][70][71][72][73][74][75][76] Previous studies on the flow around sharp 180°bends have mostly focused on higher (Re P 10 4 ) Reynolds numbers (Metzger and Sahm, 1986;Chyu, 1991;Hirota et al, 1999;Mochizuki et al, 1999;Liou et al, 2000). At these Reynolds numbers, industrial applications include ventilation piping systems and inter-cooling passages in gas turbine blades.…”

Section: Introductionmentioning

confidence: 99%