Nusselt, Wilhelm

Nusse/t Number. Empidcal correlations can be obtained for a particular size of tube diameter and particular flow conditions. To generalize such results and to apply the correlations to different sizes of equipment and different flow conditions, the heat-transfer coefficient, Z, is traditionally nondimensionalized by the use of the Nusselt number, Nu named after Wilhelm Nusselt,... 

The heat transfer coefficient a is calculated by equations for the Nusselt number Nu (Wilhelm Nusselt, see box) based on a characteristic length (diameter of a sphere or tube etc.) ... 

Wilhelm Nusselt (1882-1957), a German engineer, published in 1915 his pioneering work "The basic law of heat transfer (Nusselt, 1915), in which he derived the dimensionless numbers directly from the differential equations of fluid flow and heat transfer. In this paper he states (see Topic 3.2.2) ... 

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