3. Data reduction
Due to the cover plate, which was made of polycarbonate, an
adiabatic fin tip was assumed to obtain the wall heat flux, qw, calculated
based on the effective area, given by
qw ¼
qbðWch þWf Þ
ðWch þ 2gHf Þ
ð1Þ
where Wch, Wf, Hf and g represent, respectively, channel width, fin
thickness, channel depth and fin efficiency. qb, which is the heat flux
from the heater to the working fluid, was obtained from a steadyflow
thermal energy equation with no changes in latent energy.
The average heat transfer coefficient is given by