Mixed　convection　in　a　vertical　parallel　plate　channel　is　analyzed　with　one　region　filled　with　Newtonian　fluids　and　another　region　with　non-Newtonian　nanofluids.　Pseudo-plastic　and　dilatant　fluids　are　used　as　working　base　flow　of　nanofluids.　Power-law　modelling　is　adopted　to　predict　the　effect　of　non-Newtonian　behavior　on　the　fluid　flow　and　thermal　performance　of　nanofluids,　and　the　effective　kinematic　viscosity　and　thermal　conductivity　are　determined　using　linear　relations　as　functions　of　nanoparticle　loading　parameter.　The　velocity　and　temptrature　fields　are　investigated,　considering　the　influence　of　power-law　index　n(0.6　＜=　n　＜=　1.4)　and　nanoparticle　volume　fraction　phi(0　＜=　phi　＜=　4%).　Two　cases　have　been　paid　special　attention　in　the　present　work,　that　is,　Case　I:　in　the　absence　of　viscous　dissipation　(Br　=　0,　GR　not　equal　0),　and　Case　II:　in　the　absence　of　buoyancy　forces　(GR　=　0,　Br　not　equal　0)　when　purely　forced　convection　happens.　It　is　observed　that　the　power-law　index　has　a　strong　effect　on　the　shape　of　velocity　profile,　and　on　the　scale　of　temperature　curves.　The　results　reveal　that　the　power-law　effect　on　both　velocity　and　temperature　is　more　observable　in　shear-thinning　fluids　than　that　in　the　dilatant　flow.　These　findings　demonstrate　that,　in　some　potential　applications,　the　shear-thinning　fluid　should　be　chosen　for　its　higher　effectiveness　on　fluid　driving　where　the　non-Newtonian　fluid　is　used　to　drive　Newtonian　flow　via　interface　shear.　(C)　2017　Elsevier　B.V.　All　rights　reserved.