Turbulent Flow in D-Type Corrugated Pipes: Flow Pattern and Friction Factor

Stel, Henrique; Franco, A.; Junqueira, Silvio L. M.; Erthal, Raul H.; Mendes, R. Vilela; Gonçalves, Marcelo A. L.; Morales, Rigoberto E. M.

doi:10.1115/1.4007899

Cited by 29 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous theoretical and experimental filtration models have not considered the three-dimensionality of branchial arches and the slots between arches 11 12 13 14 . These structures create d -type roughness, characterized by a series of grooves between closely spaced spanwise ribs that form backward-facing steps along a tube or channel, with a groove aspect ratio (groove width w divided by rib height h ) of <3 to 4 (refs 15 , 16 ). Inertial microfluidics devices for cell collection 17 have converged on nonporous grooves (trapping chambers or expansion-contraction reservoirs) that essentially create d -type roughness.…”

mentioning

confidence: 99%

Fish mouths as engineering structures for vortical cross-step filtration

et al. 2016

View full text Add to dashboard Cite

Suspension-feeding fishes such as goldfish and whale sharks retain prey without clogging their oral filters, whereas clogging is a major expense in industrial crossflow filtration of beer, dairy foods and biotechnology products. Fishes' abilities to retain particles that are smaller than the pore size of the gill-raker filter, including extraction of particles despite large holes in the filter, also remain unexplained. Here we show that unexplored combinations of engineering structures (backward-facing steps forming d-type ribs on the porous surface of a cone) cause fluid dynamic phenomena distinct from current biological and industrial filter operations. This vortical cross-step filtration model prevents clogging and explains the transport of tiny concentrated particles to the oesophagus using a hydrodynamic tongue. Mass transfer caused by vortices along d-type ribs in crossflow is applicable to filter-feeding duck beak lamellae and whale baleen plates, as well as the fluid mechanics of ventilation at fish gill filaments.

show abstract

mentioning

confidence: 99%

Fish mouths as engineering structures for vortical cross-step filtration

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In control trials, sustained vortical flow structures (Stel et al, 2012;Dol et al, 2014;Sanderson et al, 2016) were visible downstream of all cannulae through which dye was introduced. When dye was introduced through the cannulae positioned anterior to the first gill slot, a prominent vortical flow was visible along the anterior margin of the first gill slot (Fig.…”

Section: Flow Patternsmentioning

confidence: 99%

Integration of swimming kinematics and ram suspension feeding in a model American paddlefish,Polyodon spathula

Haines

Sanderson

2017

Journal of Experimental Biology

View full text Add to dashboard Cite

Ram suspension-feeding fishes swim with an open mouth to force water through the oral cavity and extract prey items that are too small to be pursued individually. Recent research has indicated that, rather than using a dead-end mechanical sieve, American paddlefish () employ vortical cross-step filtration. In this filtration mechanism, vortical flow that is generated posterior to the branchial arches organizes crossflow filtration processes into a spatial structure across the gill rakers. Despite the known impact of locomotor kinematics on fluid flow around the bodies of swimming fish, the effects of locomotor kinematics on filtration mechanisms in ram suspension feeders are unknown. Potential temporal organization of filtration mechanisms in ram suspension-feeding fish has not been studied previously. We investigated the effects of locomotor kinematics associated with undulatory swimming on intra-oral flow patterns and food particle transport. A mechanized model of the oral cavity was used to simulate the swimming kinematics of suspension-feeding paddlefish. We recorded fluctuations of flow speed and pressure within the model, which occurred at a frequency that corresponded with the frequency of the model's strides. Using the mechanized model in a flow tank seeded with cysts, we also showed that swimming kinematics aided the transport of this simulated food to the posterior margins of the gill slots, although the time scale of this transport is expected to vary with prey parameters such as size and concentration. Dye stream experiments revealed that, although stable vortical flow formed because of flow separation downstream of backward-facing steps in control trials, vortical flow structures in mechanized trials repeatedly formed and shed. These findings suggest strong integration between locomotor and feeding systems in ram suspension-feeding fishes.

show abstract

“…As to the local features and flow patterns are difficult to obtain by experimental methods, many numerical works are performed with various turbulence models. The turbulent flow in dtype corrugated pipes of various aspect ratios was numerically investigated using k-e turbulence model by Stel et al [13]. Manca et al [14] numerically studied the forced convection in a ribbed channel, with different height, width, and shape (square, rectangular, triangular and trapezoidal) by the SST k-x turbulence model.…”

Section: Introductionmentioning

confidence: 99%