ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
LIQUID FLOW AND HEAT TRANSFER IN MICROCHANNELS WITH/WITHOUT PHASE CHANGE
Аннотация
We have briefly reviewed here with discussions
for the developments and achievements of the
researches on fluid flow and heat transfer
characteristics in microchannels having the dimensions
ranging from several hundred to 0.1 micrometers in
last few years. A sequence of experiments have been
conducted to examine the liquid flow and heat transfer
in microchannels with/without phase change. This
research has exposed some quite strange phenomena
and characteristics which are distinctly dissimilar to
those of liquid forced convection and flow boiling in
conventional macro channels or tubes. Especially, the
performance of heat transfer in transition and laminar
was found greatly affected by inlet liquid temperature,
velocity and microchannel size besides the Reynolds
number which is considered as only critical parameter
describing the laminar heat transfer for conventional
case if buoyancy is neglected, and there is no
observable vapor bubble in the microchannels even for
the fully developed nucleate boiling. The research on
these objectives is currently new active area. The
experimentation manifests these transport processes
and phenomena are extremely complicated. There is
still a lot of future work, for instance, to identify the
behaviors of laminar, transition heat transfer, flow
boiling, and flow and heat transfer regime conversions.
Also, experimental and theoretical methodology seems
being needed to innovate and develop in the future
investigations.