PETROCHEMICAL REACTORS GAS-LIQUID MODEL FINITE VOLUME METHOD BUBBLE COLUMN REACTORS ENVIRONMENTAL ENGINEERING FINITE VOLUMES HELICAL COILS HEAT TRANSFER STIRRED TANKS NEW TWO-DIMENSIONAL METHOD GRID GENERATION NEW SPLINE METHOD TWO-PHASE MODEL FCC RISER THREE-DIMENSIONAL MODEL TUBES REACTION HYDRODESSULFURIZATION - HDT STIRRED TANK NUSSELT EQUATION WORLD CONGRESS OF CHEMICAL ENGINEERING SYMPOSIUM FIRED HEATERS COKE FORMATION EFFLUENT DISPERSION IN RIVERS THREE DIMENSIONAL MODEL IMPELLER ANCHOR IMPELLERS FOOD DRYING PETROLEUM REFINERY HEATERS SUBSEA PIPELINE FREE-SPAN HEAT TRANFER CHAOS FLUIDIZED BED MIXING TIME SERIES PRE-HEATER REACTOR DESIGN IMPELLERS BIOREACTORS GAS-LIQUID MIXING