Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
The design of perforated-plate heat exchanger is combined
with a high thermal conductance in transverse direction with a
low thermal conductance in axial direction. Perforated plate
matrix heat exchangers (MHE) essentially consist of a stack of
perforated plates made of high thermal conductivity material
alternating with spacers made of low thermal conductivity
material. The single blow transient test is most appropriate for
determining the heat transfer coefficients of perforated plate
MHEs. Dimensionless temperature and dimensionless time are
determined from the exit temperature history of the single blow
transient test. The slope is determined from the dimensionless
temperature and time plot. The maximum slope and time at
which the maximum slope occurs is used in this method for the
determination of ntu and longitudinal heat conduction factor
simultaneously. The experimentation in this work is to examine
the effect of plate thickness to perforation diameter ratio (l/d)
and spacer thickness to plate thickness ratio (s/l) on the heat
transfer characteristics. The heat transfer and the flow friction
characteristics data are presented in the form of Colburn factor
(j) and fanning friction factor (f) vs. Reynolds number (Re)
respectively. The j and f increase as the l/d value increases. The
value of j and f decrease as the s/l value of the plate increases
for MHE.
