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Monday, August 3, 2020 | History

2 edition of Low Reynolds number flow in the presence of a corrugated boundary found in the catalog.

Low Reynolds number flow in the presence of a corrugated boundary

King Lok Kenneth Ma

# Low Reynolds number flow in the presence of a corrugated boundary

## by King Lok Kenneth Ma

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• 8 Currently reading

Written in English

Edition Notes

 ID Numbers Statement King Lok Kenneth Ma. Open Library OL15020648M

This study investigates the Taylor–Couette flow (TCF) with a longitudinal corrugated surface on a stationary outer cylinder and a rotating smooth inner cylinder using large eddy simulation for three values of amplitude to wavelength ratios (A *) (, , and ) to explore the influence of the corrugated surface on the flow structures and the variation of torque for a wider range. Back to Engineering Data Book III Home. «Chapter 4 Chapter 6». Table of Contents.

Anisotropic particles are common in many industrial and natural turbulent flows. When these particles are small and neutrally buoyant, they follow Lagrangian trajectories while exhibiting rich orientational dynamics from the coupling of their rotation to the velocity gradients of the turbulence field. This system has proven to be a fascinating application of the fundamental properties of. Thus, as the Reynolds Number of an airfoil is increased, the boundary layer in the region of separa- tion becomes turbulent with resultant delay in the separation of flow from the airfoil and, consequently, a 4 6 6 /0 Sphere diameter, inches 12 Figure 17 —Variation of critical Reynolds Number with sphere diameter for some of the wind tunnels.

Turbulent Boundary Layer Hairpin Vortex Logarithmic Layer Spanwise Wavelength Friction Reynolds Number KAWAHARA, G., JIMÉNEZ, J., UHLMANN, M. & PINELLI, A. Linear instability of a corrugated vortex sheet–a R. Turbulence statistics in fully developed channel flow at low Reynolds number. J. Fluid Mech. , – Kim, H.T., Kline, S.J. and Reynolds, W.C., The production of turbulence near a smooth wall in a turbulent boundary layers, J. Fluid Mech. 50, () CrossRef.

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### Low Reynolds number flow in the presence of a corrugated boundary by King Lok Kenneth Ma Download PDF EPUB FB2

A comprehensive analysis of the pressure-gradient driven flow in a meandering channel has been presented. This geometry is of interest as it can be used for the creation of streamwise vortices which magnify the transverse transport of scalar quantities, e.g.

heat by: 7. Wavy walls are investigated in this paper as a passive scheme to improve the heat transfer performance of low-Reynolds-number laminar flows in microchannel heat sinks for electronics cooling. Corrugated hydrofoils are lately getting attention because of their superior aerodynamic performance compared to engineered hydrofoils at low Reynolds numbers (Re).

A particle image velocimetry (PIV) based study on corrugated hydrofoil is conducted here to understand the flow dynamics around it at ultralow Reynolds numbers (Re = –11,). Seven different angles of Cited by: 1.

In the present study, the effects of superhydrophobic surface on the flow around an NACA hydrofoil are experimentally investigated at low Reynolds number range of – $$\times 10^{4}$$. The high-resolution boundary layer measurements show that the flow over rough wings is indeed laminar at low angle-of-attack and Reynolds number, but becomes turbulent at higher values.

PDF | The aerodynamic forces and flow structures of a NACA airfoil in some unsteady motions at small Reynolds number (Re=) are studied by | Find, read and cite all the research you need.

The boundary-layer separation and wake structure of a NACA airfoil and the effect of external excitations in presence of structural vibrations on airfoil performance were studied experimentally.

Wind tunnel experiments were carried out for three Reynolds numbers and three angles of attack, involving hot-wire measurements and complementary Cited by: Figure A uniform open-channel flow: the depth and the velocity profile is the same at all sections along the flow. 12 One kind of problem that is associated with uniform flow is what the channel slope will be if discharge Q, water depth d, and bed sediment size D are specified or imposed upon the flow.

The flow field around the corrugated airfoil at chord Reynolds number R e = with an angle of attack of α = 2 ∘ was taken up as a characteristic example to analyze the aerodynamics of a corrugated airfoil in relation to the flow field around it at the low Reynolds number flow and low angle of attack.

Velocity and velocity gradient statistical profiles establish the present flow as a canonical flat plate boundary layer. Spatial correlations of ∂u/∂y in the (x, y) plane, and the probability of observing negative ∂u˜ + /∂y + exceeding a negative threshold of − reveal the highly significant presence of.

Rothfus et al. [] presented the fully developed friction factor as a function of the aspect ratio and Reynolds number for laminar, transition, and turbulent flow laminar flow, f Re factors presented are the same as those of Table The associated constants of the functional relationships for the transition and turbulent flow regimes were derived from the experimental data and.

The present contribution is thus related to the fundamental analysis of forced convection in low Reynolds number flows, here illustrated by flow within micro-channels as required for the design of micro-heat exchangers, including the effects of axial heat conduction and wall corrugation or roughness on heat transfer enhancement.

Analysis. J Theor Biol. ;(4)– Shi SX. An experimental study of flow around a bio-inspired airfoil at Reynolds number x J Hydrodynamics. ;– Webb C, Dong H, Mittal R. Motion kinematics effects on aerodynamic performance of bio-inspired wing sections in ultra low Reynolds number flow.

Low Reynolds number steady and unsteady incompressible flows over two circular cylinders in tandem are numerically simulated for a range of Reynolds numbers with varying gap size. The governing equations are solved on an unstructured collocated mesh using a.

Top: Variation with the Reynolds number of the apparent plane wall location for flow transverse to the corrugations obtained numerically for A = 1, γ = 0.

Bottom: Variation with the Reynolds number of the normalized apparent wall temperature jump ΔT for values of Pri = 5, K, Κw and Δw representative of low (left) and high (right) conductive.

Direct numerical simulations of fully developed turbulent flows in a horizontal square duct heated from below are performed at bulk Reynolds numbers Re b = and (based on duct width H) and bulk Richardson numbers 0 ≤ Ri ≤ The primary objective of the numerical simulations concerns the characterization of the mean secondary flow that develops in this class of flows.

Hu and M. Tamai, “Bioinspired corrugated airfoil at low Reynolds numbers”, Journal of Aircraft, Vol, Issue 6, pp‐, [7] Masatoshi Tamai, Zhijian Wang, Ganesh Rajagopalan, Hui Hu, “Aerodynamic Performance of a Corrugated Dragonfly Airfoil Compared with Smooth Airfoils at Low Reynolds Number”, 45th AIAA Aerospace.

Search the history of over billion web pages on the Internet. In the present study, the bulk Reynolds number and Prandtl number are defined as R e m = U m H / ν and Pr = ν / α. The bulk Reynolds number and the Prandtl number were set equal and A two-step time-splitting method was employed in time stepping scheme as suggested by Kim and Moin and Zang et al.

In Eqs. Qualitatively, the Nusselt number development for other channel flows with heated walls is the same as for Poiseuille flow (regardless of geometry, turbulent flow, presence of scattering, nongrayness, etc.). The heat transfer behavior is somewhat different if a hot fluid enters a cold-walled duct (T w flow of a gas seeded with small.

In nature, flying is a unique mechanism for generating control and maneuvering forces by flapping the wings. Weis-Fogh and Jensen [] described flapping flight as a complex physical and biological problem that it is impossible to understand a single part of the process of the reasons is that the unsteady motion of wings has related flow mechanisms at a Reynolds number .The flow in the channel is induced due to the propagation of metachronal waves produced by cilia motion.

Assuming a long wavelength and low Reynolds number approximations, the governing equations are normalized and solved with a regular perturbation method. Some important remarks extracted from the study are.() Numerical study of low-Reynolds number flow over rotating rigid helix: an investigation of the unsteady hydrodynamic force.

Fluid Dynamics Research() The performance of discrete models of low reynolds number swimmers.