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: A phenomenological model for the vortex shedding process behind cylindrical bodies is proposed in this article, where the relationship between Strouhal frequency St, drag coefficient cD, Reynolds number Re and geometric wake parameters are obtained from mass conservation, momentum conservation in the transverse direction and energy considerations.
79 citations
TL;DR: In this paper, a wind turbine airfoil is partially or fully covered with riblets and the performance of the riblet size and geometry is evaluated in the free stream flow of the wind tunnel at the Saint Anthony Falls Laboratory, University of Minnesota.
78 citations
TL;DR: In this paper, a method of adapting Hill's principles to the Ellis model was developed and used to calculate upper and lower bounds on the drag coefficient for a sphere moving slowly through such a fluid.
Abstract: Hill's extremum principles are not directly applicable to an Ellis model fluid. A method of adapting Hill's principles to the Ellis model was developed and used to calculate upper and lower bounds on the drag coefficient for a sphere moving slowly through such a fluid. Available experimental data were compared with the average of the upper and lower bounds. Agreement was poor with Slattery's data and good with Turian's data. Some reasons to suspect Slattery's data have been pointed out.
78 citations
TL;DR: In this paper, the effects of sub-grid structures on the evolution of interphase transport coefficients and influence the predictive capability of coarse-grid computational fluid dynamics (CFD) models in simulating fluidized-bed reactors were analyzed.
78 citations
TL;DR: In this article, a pseudofluid-based approach is proposed to parameterize the drag coefficient and Reynolds number for flows through arrays of emergent cylinders, for which an analogy is made between the cylinder-induced drag in an open channel flow and that induced by the cylinder settling in a stationary fluid.
Abstract: The emergent vegetation in open-channel flows is usually simulated using arrays of circular cylinders in laboratory experiments. Analysis of recent experimental data reveals that for a given Reynolds number, the drag coefficient of a cylinder in a dense array is larger than that of an isolated cylinder. A new approach is applied to parameterize the drag coefficient and Reynolds number for flows through arrays of emergent cylinders. The approach is developed based on the concept of pseudofluid, for which an analogy is made between the cylinder-induced drag in an open-channel flow and that induced by the cylinder settling in a stationary fluid. With the proposed parameterization, the experimental database is successfully reorganized in such a way that a generalized drag coefficient is related to a generalized Reynolds number by one single curve, which is valid for a wide range of solid fractions and Reynolds numbers. However, it should be mentioned that only rigid circular stems are considered in th...
78 citations