Topic
Drag coefficient
About: Drag coefficient is a research topic. Over the lifetime, 14471 publications have been published within this topic receiving 303196 citations. The topic is also known as: drag factor.
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TL;DR: In this paper, a new method based on hydrogen pump is presented to measure the electro-osmotic drag coefficient and proton conductivity in Nafion® 117 membrane under similar condition to operating PEMFC.
89 citations
TL;DR: In this article, the authors calculate the drag force experienced by an infinitely massive quark propagating at constant velocity through an anisotropic, strongly coupled strongly coupled plasma by means of its gravity dual.
Abstract: We calculate the drag force experienced by an infinitely massive quark propagating at constant velocity through an anisotropic, strongly coupled $ \mathcal{N} = 4 $
plasma by means of its gravity dual. We find that the gluon cloud trailing behind the quark is generally misaligned with the quark velocity, and that the latter is also misaligned with the force. The drag coefficient μ can be larger or smaller than the corresponding isotropic value depending on the velocity and the direction of motion. In the ultra-relativistic limit we find that generically μ ∝ p. We discuss the conditions under which this behaviour may extend to more general situations.
89 citations
TL;DR: In this paper, the steady and incompressible flow of non-Newtonian fluids past a circular cylinder is investigated for power law indices n between 0.2 and 1.4, blockage ratios of 0.037, 0.082 and 0.164, and the Reynolds numbers Re of 1, 20 and 40, using a stream function/vorticity formulation.
Abstract: The steady and incompressible flow of non-Newtonian fluids past a circular cylinder is investigated for power law indices n between 0.2 and 1.4, blockage ratios of 0.037, 0.082 and 0.164, and the Reynolds numbers Re of 1, 20 and 40, using a stream function/vorticity formulation. The governing field equations have been solved by using a second-order accurate finite difference method to determine the drag coefficient, wake length, separation angle and flow patterns, and to investigate their dependence on power law index, blockage ratio and Reynolds number. The results reported here provide fundamental knowledge on the dependence of engineering flow parameters on blockage ratio and power law index, and further show that the effects on stream line and iso-vorticity patterns which result from an increase in the blockage ratio are similar to those which result from a decrease in the power law index.
89 citations
TL;DR: In this article, the effects of the Reynolds number, spacing ratio and rotation angle of the downstream cylinder on flow characteristic modes, drag coefficients and vortex shedding properties were studied, and the particle image velocimetry scheme was applied to examine and classify the flow field into three characteristic modes: vortex sheet of the single mode, reattached mode and binary mode.
89 citations
TL;DR: In this paper, the Stokes equations of motion were used to study the viscous flow at low Reynolds numbers passing through an infinite row of parallel circular cylinders of the same radius.
Abstract: Steady viscous flow at low Reynolds numbers passing through an infinite row of parallel circular cylinders of the same radius is investigated on the basis of the Stokes equations of motion. Tamada and Fujikawa's expansion formula for the drag coefficient has been extended up to the 14th power of the diameter-distance ratio of the row. An alternative simple formula is presented for the case where the said ratio approaches unity so that the above-mentioned expansion formula becomes divergent. Numerical discussion is made on the drag coefficient versus the diameter-distance ratio of the row.
89 citations