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Heat Transfer Terminology Summary
Conduction-Rectangular Coordinates - h1012v2_29

Thermodynamics Heat Transfer and Fluid Flow Volume 2 of 3
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CONDUCTION HEAT TRANSFER Heat Transfer CONDUCTION HEAT TRANSFER Conduction heat transfer is the transfer of thermal energy by interactions between adjacent atoms and molecules of a solid. EO 1.6 Given Fourier’s Law of Conduction, CALCULATE the conduction heat flux in a rectangular coordinate system. EO 1.7 Given     the     formula     and     the     necessary     values, CALCULATE the equivalent thermal resistance. EO 1.8 Given Fourier’s Law of Conduction, CALCULATE the conduction heat flux in a cylindrical coordinate system. Conduction Conduction  involves  the  transfer  of  heat  by  the  interaction  between  adjacent  molecules  of  a material.    Heat  transfer  by  conduction  is  dependent  upon  the  driving  "force"  of  temperature difference and the resistance to heat transfer.   The resistance to heat transfer is dependent upon the nature and dimensions of the heat transfer medium.   All heat transfer problems involve the temperature difference, the geometry, and the physical properties of the object being studied. In  conduction  heat  transfer  problems,  the  object  being  studied  is  usually  a  solid.    Convection problems involve a fluid medium.   Radiation heat transfer problems involve either solid or fluid surfaces, separated by a gas, vapor, or vacuum.  There are several ways to correlate the geometry, physical properties, and temperature difference of an object with the rate of heat transfer through the  object.    In  conduction  heat  transfer,  the  most  common  means  of  correlation  is  through Fourier’s Law of Conduction.  The law, in its equation form, is used most often in its rectangular or cylindrical form (pipes and cylinders), both of which are presented below. Rectangular (2-4) Q k  A DT Dx Cylindrical (2-5) Q k  A DT Dr HT-02 Page 6 Rev. 0







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