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A two-dimensional heat conducting object with a cross-section size of 200 x 300 mm has the following boundary conditions: left adiabatic; right-side convective heat transfer with contact fluid, with a surface heat transfer coefficient of 50 W/(m2.K) and a fluid temperature of 20 C; the upper side maintains a uniform temperature of 400 C; and the lower side is heated by normal heat flow with a heat flux of 1500 W/m2. It is known that the thermal conductivity of the object is 45 W/ (M. K). Using uniform mesh and delta y= x=50mm, the temperature distribution of the object is calculated by numerical method.