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Thermofluid 1

1. Introduction. Transport phenomena ThermodynamicsConcerns initial and final states (not the process)1st law of thermodynamics ? energy conservation2nd law ? direction of energy transportTransport phenomenaFluid mechanics ? rate of momentum transport?Momentum in transit due to velocity gradi

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Thermofluid 1

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    1. Thermofluid 1 Introduction to Transport Phenomena & Conduction Heat Transfer Prof. Dongsik Kim

    2. 1. Introduction Transport phenomena Thermodynamics Concerns initial and final states (not the process) 1st law of thermodynamics ? energy conservation 2nd law ? direction of energy transport Transport phenomena Fluid mechanics ? rate of momentum transport “Momentum in transit due to velocity gradient” Heat transfer? rate of thermal energy transport “Energy in transit due to temperature gradient”

    3. Symbols and units Thermal energy: E=[J] Heat transfer rate: q=[W]=[J/s] Heat transfer rate per unit length q/L=[W/m] Heat transfer rate per unit length q/A= [W/m2] Temperature: T=[oC] or [K] T(oC)=T(K)+273.15 Note: When oC or K unit is in the denominator, unit change doesn't affect the numerical value, e.g., specific heat Cp 1 J/kg.oC=1 J/kg.K, thermal conductivity 1 W/m.oC=1 W/m.K

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