Question

Discuss the inaccuracies in the tate equation and explain how a correction factor may be obtained and applied?

Answer 1

Sieder-Tate Equation

The Dittus-Boelter correlation may be used for small to moderate temperature differences, T_wall – T_avg, with all properties evaluated at an averaged temperature T_avg.

For flows characterized by large property variations, the corrections (e.g. a viscosity correction factor μ/μ_wall) must be taken into account, for example, as Sieder and Tate recommend.

When the difference between the surface and the fluid temperatures is large, it may be necessary to account for the variation of viscosity with temperature. Therefore a modified form of Dittus-Boelter equation was proposed by Sieder and Tate (1936).