Gas-liquid　two-phase　intermittent　flow　pattern　and　frictional　pressure　drop　in　new　silicon　multi-microchannel　were　investigated　experimentally　by　means　of　the　IDT　high-speed　camera　mounted　together　with　a　Nikon　microscope.　Each　test　section　consisted　of　10　parallel　microchannels　with　0.1　mm　wide　and　0.2　mm　deep　in　constant　cross-section　segment　and　each　microchannel　consisted　of　an　array　of　periodic　reentrant　cavities.　The　major　two-phase　flow　pattern　observed　was　intermittent　in　the　test　sections,　and　the　intermittent　sub　regimes　in　the　new　microchannels　were　different　from　those　displayed　in　the　rectangular　straight　microchannel.　Using　nitrogen　and　deionized　water　as　working　fluids,　the　intermittent　sub　regime　maps　for　the　new　multi-microchannel　were　obtained.　Meanwhile,　the　pressure　drops　were　compared　with　several　existing　correlations　based　on　the　homogeneous　or　separated　mixture　assumption.　Results　show　that　the　homogeneous　flow　model　cannot　predict　the　two-phase　pressure　drop　data　well,　while　the　separated　flow　model　is　proposed　to　provide　a　better　prediction　of　the　two-phase　frictional　pressure　drop.　Among　the　separated　flow　models　investigated,　the　best　two　correlations　of　C　value　can　provide　mean　deviations　within　less　than　16%　for　all　the　three　microchannels　and　all　the　predictions　lie　in　the　bound　of　+/-　30%.　(C)　2014　Elsevier　Inc.　All　rights　reserved.