Large eddy simulation of the turbulent flow past a backward-facing step with heat transfer and property variations

Avancha, Ravikanth; Pletcher, Richard H.

doi:10.1016/s0142-727x(02)00156-x

Cited by 77 publications

(73 citation statements)

References 22 publications

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“…Vogel and Eaton [3] studied heat transfer characteristics of the flow over a backwardfacing step and found that a drop in the heat transfer coefficient occurs near flow separation and a rise occurs upstream of the flow reattachment zone. This particular variation of the heat transfer coefficient in this flow has been reported in several other studies [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Some other features of this configuration include correlation of turbulence intensity with the heat transfer coefficient near reattachment, recovery of Stanton number profile after reattachment towards equilibrium turbulent boundary layer value, correlation of r.m.s.…”

Section: Introductionsupporting

confidence: 82%

Direct simulation of turbulent heat transfer in swept flow over a wire in a channel

Ranjan

Pantano

Fischer

2011

International Journal of Heat and Mass Transfer

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Section: Introductionsupporting

confidence: 82%

Direct simulation of turbulent heat transfer in swept flow over a wire in a channel

Ranjan

Pantano

Fischer

2011

International Journal of Heat and Mass Transfer

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“…8. The resulting flow has been studied extensively [35,36] as a model problem for numerical simulations [37,38] and experiments [39]. It is conventional in these problems to characterise the size of the turbulent recirculation region behind the step by the step height H, and to characterise the flows by a Reynolds number Re based on the free-stream velocity U ∞ and by the step height H, Re H = U ∞ H/ν, with ν f the kinematic viscosity of the fluid.…”

Section: Case Study Ii: Backwards-facingmentioning

confidence: 99%

“…Direct numerical simulations (DNS) have been performed on these flows [37,38] and have provided great insight into the turbulent flow field and its effect on the heat transfer behaviour. Nevertheless, these computations require great resources and long computational times for completion.…”

Section: Heated Foilmentioning

confidence: 99%

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Mathie

Nakamura

Markides

2013

International Journal of Heat and Mass Transfer

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Many energy conversion and other thermal-fluid systems exhibit unsteady convective heat exchange. In such systems, generic spatiotemporal variations in the flow give rise to variations in the heat flux for a given fluid-solid temperature difference, which can be interpreted as spatiotemporal fluctuations of the instantaneous heat transfer coefficient. These variations can lead to unsteady conjugate heat transfer, in which the exchanged heat flux arises from an interaction between the bulk fluid temperature and the temperature in the solid. Further, the nonlinear coupling between the fluctuating temperature differences and the heat transfer coefficient can lead to an effect we refer to as augmentation, which quantitatively describes the ability of a particular arrangement to have a different time-mean heat flux from the product between the mean heat transfer coefficient and the mean temperature difference across the fluid. It is important to be able to understand and to model in a simple framework the effects of the material properties, the geometry and the character of the heat transfer coefficient on the thermal response of the fluid-solid system, and consequently to predict the overall heat transfer performance of these systems. This paper, which follows on from its predecessor (Mathie and Markides, 2012a), is concerned with the phenomenon of augmentation in simple, one-dimensional, unsteady and conjugate fluid-solid systems. A simple semi-analytical one-dimensional model of heat transfer with a time-varying heat transfer coefficient, which was presented in Mathie and Markides (2012a), is applied herein to two different paradigm problems. Such a model can be an important tool in the design of improved heat exchangers and thermal insulation, through for example, the novel selection of materials to exploit these augmentation effects. The first flow considered is a thin, wavy fluid film flowing over a heated plate. This film flow exhibits a periodic fluctuation in the heat transfer coefficient, that is linked to the wavy interfacial deformations of free surface of the liquid film. The second flow considered concerns the heat transfer behind a backwards-facing step, which exhibits broadband fluctuations in the heat transfer coefficient due to the flow separation and turbulence behind * Corresponding author.

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“…Since the transport of the SGS thermal energy due to unresolved turbulent motions is fundamentally different and much more complex than that due to a molecular heat conduction process, it is understood that the conventional dynamic eddy thermal diffusivity SGS HF model (DEDM-HF) as introduced by Moin et al [26] cannot correctly reflect the geometrical property of the SGS HF vector as required by the physics of turbulence, and this has been confirmed by the recent study of Abe and Suga [27]. Nevertheless, the DEDM-HF is still the most popular model in literature and has been successfully applied for predicting the mean properties of the turbulent scalar fields [28][29][30][31][32][33][34][35][36]. Here, we use a suffix ''-HF" to indicate a SGS HF model, so that the abbreviation for a SGS HF model can be differentiated from that for a SGS stress model.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation of combined forced and natural convection in a vertical plane channel

Wang

Bergstrom

2007

International Journal of Heat and Mass Transfer

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Large eddy simulation of the turbulent flow past a backward-facing step with heat transfer and property variations

Cited by 77 publications

References 22 publications

Direct simulation of turbulent heat transfer in swept flow over a wire in a channel

Direct simulation of turbulent heat transfer in swept flow over a wire in a channel

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Large-eddy simulation of combined forced and natural convection in a vertical plane channel

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