In　this　paper,　Computational　Fluid　Dynamics　(CFD)　technique　is　used　to　investigate　the　optimum　geometry　parameters　of　the　adjustable　ejector,　which　is　used　in　variable　cooling　loads　conditions,　for　the　performance　of　pressure　recovery　in　a　multi-evaporator　refrigeration　system　(EMERS)　using　R134a　as　the　refrigerant.　The　performance　of　pressure　recovery　reflects　the　performance　of　the　compression　energy　saving.　The　developed　CFD　model　is　first　validated　by　actual　experimental　data　of　an　EMERS.　The　k-w-sst　model　is　chosen　as　the　turbulence　model,　and　then　used　to　find　the　optimum　geometry　parameters:　nozzle　diverging　angle,　length　of　the　constant-pressure　mixing　section,　nozzle　exit　position　and　converging　angle　of　the　constant-pressure　mixing　section,　for　high　performance　in　pressure　recovery　properties.　Through　the　analysis　of　physical　mechanism,　the　results　indicate　that　the　pressure　recovery　ratio　can　be　efficiently　improved　after　the　geometries　optimization　which　is　very　sensitive　to　the　nozzle　diverging　angle　and　the　length　of　the　constant-pressure　mixing　section.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.