Segmental　baffles　are　used　in　the　conventional　shell　and　tube　heat　exchanger　(STHX).　Helical　baffles　can　be　used　in　place　of　segmental　baffles,　which　increase　the　heat　transfer　efficiency　and　lessen　the　pressure　losses.　To　avoid　flow　induced　vibrations　and　eliminate　stagnant　recirculation　zones,　a　new　type　of　clamping　anti-vibration　baffle　is　proposed.　Three　dimensional　CFD　simulations,　have　been　performed　on　ANSYS　FLUENT　to　study　and　compare　the　pressure　drop　and　heat　transfer　coefficient　between　the　newly　designed　clamping　anti-vibration　baffles　with　square　twisted　tubes,　helical　baffles　with　cylindrical　tubes　and　conventional　segmental　baffle　with　cylindrical　tubes.　For　the　numerical　comparison　whole　heat　exchangers　are　modeled,　the　numerical　model　shows　the　thermo-hydraulic　performance　with　good　accuracy　by　comparing　it　with　Kern　and　Esso　methods　for　single　segmental　baffles.　It　is　then　used　to　compare　the　performance　of　the　same　heat　exchanger　with　clamping　anti-vibration　baffles　with　square　twisted　tubes　(CBSTT-STHX)　and　helical　baffles　with　cylindrical　tubes　(HBCT-STHX).　CBSTT-STHX　has　a　higher　heat　transfer　coefficient　than　segmental　baffles　with　cylindrical　tubes　(SGCT-STHX)　and　less　pressure　drop　than　both　helical　baffle　with　cylindrical　tube　(HBCT-STHX)　and　segmental　baffle　with　cylindrical　tubes　(SGCT-STHX),　while　its　comprehensive　performance　is　higher　than　SGCT-STHX　and　slightly　less　than　HBCT-STHX.　(C)　2019　The　Authors.　Published　by　Elsevier　Ltd.