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This paper investigates the Fuel-oil Electric Heater (FEH) flow field using CFD method. Both natural convection caused by buoyancy lift and forced convection caused by oil flow have been considered; the effects of equipment arrangement on temperature field distribution have been analysed. The results show that when inlet is located above, the outlet temperature is higher than other cases. At last, the unsteady flow field has also been calculated for preheating process, and the preheating time range and temperature sensors’ location have been pointed out.