Finite element simulation of transient laminar flow and heat transfer past an in-line tube bank
The second should be used for heat transfer across a tube bank
with tubes which are close to each other (pitch to outer diameter ratio < 3).
[h.sub.ic] heat transfer coefficient for ideal tube bank
in the interior cross flow zone, W/[m.sup.2] K
Taborek  presented simple set of equations for ideal tube bank
During the circumfluence of the tube bank
the conditions for the first row of tubes are only a little different from those around one tube.
Particles larger than about 0.04 mm in diameter are removed and recirculated to the combustor bottom, while smaller particles and flue gas continue on through the convection tube bank
. Wastage of tubes and other materials can occur anywhere along the gas path due to entrained particles.
On the negative side of PFBC, there were some technological uncertainties which included: performance of the dry feeding system, gas turbine, ash collection system and erosion and maintenance of the tube bank
As a main cooling surface an in-line tube bank
consisting of five tubes of a total area of 1.2 [m.sub.2] and the tube outer diameter of 25 mm was used.