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.
Papers published on a yearly basis
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TL;DR: In this article, a combinational opposing jet and aerospike concept, and the influences of length-to-diameter ratio of aerospikes and jet pressure ratio on the drag reduction mechanism have been evaluated.
88 citations
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TL;DR: In this article, the problem of a vertically thrown ball, with a drag force which is either linear or quadratic in the speed, is discussed. And the equations of motion are solved analytically and several true-to-life examples are discussed.
Abstract: We review the problem of a vertically thrown ball, with a drag force which is either linear or quadratic in the speed. It is stressed from the outset that these two types of drag correspond to specific ranges of the Reynolds number (Re<1 and 103
88 citations
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TL;DR: In this article, a second-order accurate finite volume code is modified in order to reconstruct the adjacent cells to the riblets at Cartesian coordinates, and a quadratic interpolation scheme is used to estimate the fluxes at the reformed cells.
88 citations
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TL;DR: The effect of a triathlon wet suit on drag was studied in 12 subjects swimming at different velocities and a reduction in drag of 12% was observed, which suggests that the wearing of such a suit might be beneficial in conventional swimming events.
Abstract: The effect of a triathlon wet suit on drag was studied in 12 subjects (eight male, four female) swimming at different velocities (1.10, 1.25 and 1.50 m.s-1). The active drag force was directly measured during front crawl swimming using a system of underwater push off pads instrumented with a force transducer (M.A.D. system: 6). Measurements were made when swimming over the system with and without a wet suit. A 14% reduction in drag (from 48.7 to 41.8 Newtons) is found at a swimming velocity of 1.25 m.s-1, which is a typical swimming speed for triathlon distances. At 1.50 m.s-1 a reduction in drag of 12% was observed, which suggests that the wearing of such a suit might be beneficial in conventional swimming events. The reduction in drag can explain the higher swimming velocities observed in triathletes using a wet suit. The effect of the reduction is probably largely due to an increased buoyancy inducing less frontal resistance. However, since the effect of the suit on the lighter female swimmers was not different from the effect on the heavier male swimmers, a reduction in friction drag and drag coefficient may also be significant.
87 citations
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TL;DR: In this article, two vaporizing droplets moving in tandem are numerically investigated and the dependence on the initial droplet Reynolds number, initial spacing, initial droplets size ratio, variable properties, transfer number, and critical droplet size ratio dividing the region where droplets collide from the region of separation are determined.
87 citations