Chemical Engineering

4. In 1916, Nusselt derived a theoretical relation for predicting the coefficient of heat transfer between a pure saturated vapor and a colder surface: h=0.943(LTk32g)1/4 where h is the mean heat transfer coefficient (h[=](hr)(ft2)(F)BTU),k is the thermal conductivity (k[=](hr)(ft)(F)BTU), is the density ([=]ft3lb),g is acceleration due to gravity (g[=]4.17108hr2ft), is the enthalpy change of evaporation ([=]lbBTU), L is the length of the tube in ft, is the viscosity ([=](hr)(ft)lbm), and T is the temperature difference in F. What are the units of the constant 0.943