Transient conjugated heat transfer in thick walled pipes with
thermally developing laminar flow is analyzed. Effects of axial
fluid conduction as well as radial and axial wall conduction are
involved. The problem is solved numerically in a two regional
pipe, initially isothermal, for which the ambient temperature in
the downstream region suddenly begins to change periodically
in time. A parametric study is done to investigate the effects of
five defining dimensionless parameters of the problem, which
are namely; wall thickness ratio, wall-to-fluid thermal
conductivity ratio, wall-to-fluid thermal diffusivity ratio, the
Peclet number, the Biot number, and also the effect of the value
of the angular frequency.
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .