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Spiral groove dry gas seal (S-DGS), the most widely used DGS in the world, encounters the problem of high leakage rate and inferior film stability when used in high-speed machinery equipment, which could not be well solved by optimization of geometrical parameters and molded line of spiral groove.
Jiang et al. [20, 21] introduces a new type of bionic cluster spiral groove dry gas seal (CS-DGS) based on the coupling bionic theory, and presents the numerical study on the influence of groove geometry parameters on the sealing performance, such as opening force, axial film stiffness and seal leakage.
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The sport's sole tyre supplier, Bridgestone, provided two specifications of grooved dry tyres for the race, designated Soft (also referred to as the "prime" tyre) and Super Soft (also referred to as the "option" tyre).
The masonry is constituted by vertically perforated 35 cm thick clay units with tongue and groove and dry head-joints and general-purpose mortar bed-joints.
The cap margin, which is initially pressed against the stem, is translucent when moist, so that the outline of the gills underneath the cap may be seen, and has deep narrow grooves when dry.
His drumming draws equally from the lessons of Levon Helm (formerly with the Band) and Elvin Jones (formerly with John Coltrane), shifting naturally from a polyrhythmic tumble to a bone-dry rock groove.
The songs by Mr. Javerbaum (a producer for "The Daily Show With Jon Stewart and Mr. Schlesingerer (of the pop group Fountains of Wayne) include plenty of rockabilly riffs and soulful wails (for a Little Richard-like character played by Chester Gregory II), but they often feel stuck in a groove, repeated until they go dry.
The small dry fruit bears grooves or is winged; it consists of a single-seeded fruit surrounded by the persistent perianth tube.
When the sun is below the horizon, the only signs of the streams are grooves in the sediment and dry, dormant bacterial mats.
On metals, mix metal with a little black/brown first, then use ink for the grooves and dips, and dry-brush highlights in unmixed metal colour.
It was found that the grooved CDC coating exhibited improved tribological properties in sliding against Si3N4 in both dry and moist conditions compared with the coating without grooves.
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