Large eddy simulation of turbulent heat transfer in a rotating square duct

Qin, Zhaohui; Pletcher, Richard H.

doi:10.1016/j.ijheatfluidflow.2006.01.003

Cited by 32 publications

(14 citation statements)

References 41 publications

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“…6(a) and (b), prograde vortices are red 2 colored, and retrograde vortices are blue colored. According to the recent vortex signature study [60,61], it is revealed that there are two prevailing retrograde vortex orientations: (1) in the third quadrant of a prograde vortex core, (2) in the first quadrant of a prograde vortex core. The former corresponds to the motion of omega-shaped hairpin vortices, and the latter corresponds to the motion detached-ring like structures.…”

Section: Turbulent Flow Fieldsmentioning

confidence: 99%

“…This forced heat convection is dominated by the turbulent flow in the SSD, which has a remarkable change in flow structure due to the existence of the so-called Prandtl's second kind secondary flows [1]. Such Prandtl's second kind secondary flow has a significant effect on the transport of heat and momentum as revealed by the recent large eddy simulation (LES) [2].…”

Section: Introductionmentioning

confidence: 99%

“…for the behavior at2 For interpretation of the references to color in this figure, the reader is referred to the web version of this article.…”

mentioning

confidence: 99%

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Numerical study of forced turbulent heat convection in a straight square duct

Yang

Chen

Zhu

2009

International Journal of Heat and Mass Transfer

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Section: Turbulent Flow Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study of forced turbulent heat convection in a straight square duct

Yang

Chen

Zhu

2009

International Journal of Heat and Mass Transfer

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“…The convection, associated with these secondary flows, shifts the axial velocity peak location toward the trailing wall (Fig. 13), which is also known in literature as unstable wall or pressure side (Qin and Pletcher 2006). Therefore in the first half of the turn, the flow from the inlet duct bumps against the front wall near the trailing wall, then moves, along the front wall, toward the leading wall and finally comes back toward the turn inlet by forming a strong vortex that extends in the whole turn region (Fig.…”

Section: Leading Wallmentioning

confidence: 71%

Thermo-fluid-dynamic analysis of the flow in a rotating channel with a sharp “U” turn

2012

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Infrared thermography has been employed to carry out a detailed convective heat transfer measurements at Re = 20,000 in a two-pass square channel both for the static case (absence of channel rotation) and for the rotating case (Ro = 0.3). At the same time, the main and secondary flow fields have been measured by means of particle image velocimetry with the aim to investigate how the flow behavior affects the local distributions of the convective heat transfer coefficient for the two cases. The normal-towall velocity component (w) and the turbulent kinetic energy, both measured close to the heat exchanging wall, have been used to formulate an empirical heat transfer correlation within an attempt to identify the role performed by these two quantities on the convective heat transfer coefficient distributions. The latter ones have been reported in terms of normalized Nusselt number (Nu/Nu*) maps, where Nu* is the Nusselt number evaluated with the classical Dittus-Bölter correlation.

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“…The turbulence in the SSD has a remarkable change in flow structure due to the existence of the so-called Prandtl's second kind secondary flows [1]. The secondary flow has a significant effect on the transport of heat and momentum as uncovered by the recent large eddy simulation (LES) [2]. Extensive studies have been pursued.…”

Section: Introductionmentioning

confidence: 99%