In　the　present　study,　heat　transfer　and　friction　characteristics　of　heat　transfer　exchanger　with　a　new　type　of　enhanced　fin　-　convex　fin　was　experimentally　investigated.　For　comparison,　a　plain-fin　heat　transfer　surface　with　the　same　dimension　was　also　tested.　At　low　Reynolds　number　the　airside　convective　heat　transfer　coefficient　of　the　convex-fin　is　25%　higher　than　that　of　the　plain-fin.　At　high　Reynolds　number　the　heat　transfer　coefficients　of　the　convex-fin　is　slightly　higher　than　the　heat　transfer　coefficient　of　the　plain　fin.　The　pressure　drop　of　the　new　enhanced　fin　increases　by　16%.　The　convex-fin　is　suitable　for　enhancing　heat　transfer　at　low　and　middle　velocity　condition　commonly　encountered　in　air-cooling　industry.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.