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Wikipedia definition
1. Nusselt numberIn heat transfer at a boundary (surface) within a fluid, the Nusselt number is the ratio of convective to conductive heat transfer across the boundary. In this context, convection includes both advection and conduction. Named after Wilhelm Nusselt, it is a dimensionless number. The conductive component is measured under the same conditions as the heat convection but with a (hypothetically) stagnant (or motionless) fluid.
Read “Nusselt number” on English Wikipedia
Read “ヌセルト数” on Japanese Wikipedia
Read “Nusselt number” on DBpedia

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