In　thermal　recovery　of　heavy　oil,　phase　separation　often　occurs　when　a　steam-water　stream　turns　to　branches　in　a　junction　and　distributor,　thereby　resulting　in　a　significant　quality　deviation　between　branches.　Although　a　lot　of　efforts　have　been　made　during　the　past　decades,　the　problem　is　still　not　well　solved.　Inspired　by　the　principle　of　the　isokinetic　probe,　this　paper　builds　a　new　model　of　distribution.　The　major　change　is　that　the　inner　space　of　the　main　pipe　is　isolated　into　fan-shaped　isokinetic　flow　channels,　each　connecting　to　a　side　branch.　Flow　control　devices　are　installed　at　the　outlet　of　each　branch.　Moreover,　a　swirler　is　used　to　convert　the　incoming　flow　pattern　into　a　uniform　swirling　gas　core-annular　flow　before　the　new　isokinetic　dividing　system.　Computational　fluid　dynamics　(CFD)　simulations　were　conducted　to　reveal　the　characteristics　of　gas-liquid　two-phase　flow　within　the　distributor.　The　characteristics　of　both　under　isokinetic　and　nonisokinetic　flow　conditions　were　analyzed.　The　most　interesting　result　is　that　once　the　uniform　swirling　gas　core-annular　flow　is　formed,　liquid　film　flow　becomes　very　stable　and　is　almost　unaffected　by　the　operation　deviations　from　the　isokinetic　condition,　whereas　gas　flow　is　much　more　sensitive　to　the　deviations.　The　more　deviation　of　isokinetic　condition,　the　more　deflection　of　gas　flow　or　phase　separation　will　take　place　and　the　greater　quality　deviation　will　be.　Air-water　two-phase　flow　experiments　were　also　conducted　to　verify　the　CFD　results.　Copyright　©　2022　Society　of　Petroleum　Engineers.