riffled tube

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Internally riffled boiler tubes — are used to evaporate water into steam inside boilers of thermal power plants. Because of their internally riffled shape, they are more efficient. The boiling crisis takes place later, thus allowing for greater heat transfer between the pipe and… … Wikipedia
mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… … Universalium

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