Recent experimental work on enhanced Silicon microchannels (Colgan et al., 2005, Steinke, 2005) indicates significant improvement in the heat transfer coefficient during single-phase liquid flow. The enhanced microchannel consists of multi-pass arrangements with offset strip fins of short lengths. An analytical treatment employing thermal boundary layer development in the entrance region of each offset fin geometry passage is performed. The analytical results are compared with the experiments and the reasons for the differences are discussed.

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