Heat transfer and flow field in a pipe with sinusoidal wavy surface—I. Numerical investigation

Russ, Gerald; Beer, H.

doi:10.1016/0017-9310(96)00158-5

Cited by 42 publications

(19 citation statements)

References 9 publications

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“…Comparative studies between the laminar and turbulent flows in the wavy channels indicated that the secondary flows (laminar case) driven by the sharp corners of the non-circular corrugate ducts were much weaker and different from the turbulence driven secondary flows [11,13]. As an effect of increased shear stresses in the layer which separates the recirculation bubble from the main turbulent flow, the augmented Reynolds stresses result in the higher streamwise velocity gradients at the wall and reduce the size of the recirculation bubble compared to laminar flow; they therefore shorten the axial span of minimum Nusselt numbers (Nu) in the bulge of the furrowed channel [12].…”

Section: Introductionmentioning

confidence: 96%

“…Effects of such turbulent interactions on wall shear stresses and on wall heat fluxes are particularly enhanced in the wavy ducts [11]. For turbulent flows in furrowed channels [12], the shear layers promote the production of turbulence, which causes the shrinkage of the separation bubble from that developed for laminar flow in the trough of a wavy wall. Local peaks of Reynolds stresses in the nearwall region are generated near which the separation bubble is initiated.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls

Chang

Lees

Chou

2009

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls

Chang

Lees

Chou

2009

International Journal of Heat and Mass Transfer

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“…Self-sustained oscillatory flow was predicted numerically for the wavy-walled tube [17]. The mass transfer characteristics were also investigated experimentally, and it was shown that a significant enhancement occurs after the flow enters the transitional regime, as with the wavy-walled channel [18]. However, the existence of the T-S wave was not yet evident for the axisymmetric tube, as the experiments were performed only in the steady laminar flow region [19,20].…”

Section: Introductionmentioning

confidence: 98%

Fluid flow and mass transfer in a sinusoidal wavy‐walled tube at moderate Reynolds numbers

Nishimura

Bian

Kunitsugu

et al. 2003

Heat Trans. Asian Res.

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Fluid flow and mass transfer characteristics in an axisymmetric sinusoidal wavy-walled tube are experimentally investigated in the Reynolds number range of 50 to 1000. Attention is paid to the transitional flow, which is observed in the Reynolds number range of 160 to 200. In the laminar flow regime, wall shear stress and mass transfer rate increase with the slopes of 1 and 1/3, respectively, whereas in the turbulent flow regime they increase with the slopes of 3/2 and 3/5, respectively. In the transitional flow regime they increase dramatically, with a sharp slope. It is found that in this flow regime, laminar-like motion and turbulent-like motion alternatively take place at different time intervals. This is quite different from the flow instability for the wavy-walled channel, where Tollmien-Schlichting waves are observed. The flow instability in the wavy-walled tube in the transitional flow regime is considered to be responsible for a significant increase in the wall shear stress and mass transfer rate.

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“…One of the expected effects of corrugation is that the transition from laminar to turbulent flow will occur at lower Reynolds numbers (so, at Re < 2000). Nishimura et al [11], Russ and Beer [12], and Yang [13] investigated the transitional flow characteristics in corrugated ducts. Indeed, they reported the laminar-turbulent transition to occur at very low Reynolds numbers compared with conventional ducts.…”

Section: Flow Simulations For Corrugated Pipesmentioning

confidence: 99%

Friction Factor Estimation for Turbulent Flows in Corrugated Pipes with Rough Walls

Pisarenco

Linden

Tijsseling

et al. 2010

Journal of Offshore Mechanics and Arctic Engineering

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The motivation of the investigation is the critical pressure loss in cryogenic flexible hoses used for LNG transport in offshore installations. Our main goal is to estimate the friction factor for the turbulent flow in this type of pipes. For this purpose, two-equation turbulence models (k−ϵ and k−ω) are used in the computations. First, the fully developed turbulent flow in a conventional pipe is considered. Simulations are performed to validate the chosen models, boundary conditions, and computational grids. Then a new boundary condition is implemented based on the “combined” law of the wall. It enables us to model the effects of roughness (and maintain the right flow behavior for moderate Reynolds numbers). The implemented boundary condition is validated by comparison with experimental data. Next, the turbulent flow in periodically corrugated (flexible) pipes is considered. New flow phenomena (such as flow separation) caused by the corrugation are pointed out and the essence of periodically fully developed flow is explained. The friction factor for different values of relative roughness of the fabric is estimated by performing a set of simulations. Finally, the main conclusion is presented: The friction factor in a flexible corrugated pipe is mostly determined by the shape and size of the steel spiral, and not by the type of the fabric, which is wrapped around the spiral.

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Heat transfer and flow field in a pipe with sinusoidal wavy surface—I. Numerical investigation

Cited by 42 publications

References 9 publications

Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls

Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls

Fluid flow and mass transfer in a sinusoidal wavy‐walled tube at moderate Reynolds numbers

Friction Factor Estimation for Turbulent Flows in Corrugated Pipes with Rough Walls

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