(1) The proposed two-equation model, which could effectively
and simultaneously solve the conjugated problem between
the metal foam matrix, interface wall and fluid, was established
and validated. The interface wall heat flux distributions
along the axial direction is successfully predicted in
the fully developed flow region using the proposed model.
(2) Compared with the conventional constant interface wall
heat flux model, the results predicted for the proposed
model are significantly different from those obtained from
the uniform wall heat flux model. The predicted heat transfer
performance obtained in the proposed model is lower
than the uniform wall heat flux model. However, it can accurately
display real physically conjugated essence.
(3) The effects of key factors on the dimensionless excess temperature
(hf nd hs) distribution were investigated. The distributions
of excess temperature heavily depend on the
relative variation of thermal resistance of inner and annular
space in the conjugated heat transfer process.
(4) The ratio of length to inner diameter for entrance zone for
foam filled heat exchanger is extended to about 180 and
an optimal range of 0.6–0.7 for dimensionless inner tube
diameter R1/R3 is recommended for the design of metal foam
filled heat exchangers.