_:b19653 . . _:b19651 _:b19652 . _:b19651 . . _:b19653 . "The Nusselt number is the ratio of convective to conductive heat transfer across (normal to) the boundary."@en . _:b19652 . "Nu" . _:b19651 . _:b19652 . _:b19651 . "Nusselt number"@en . _:b19653 . _:b19653 . . "getal van Nusselt"@nl . _:b19652 .