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  Heat and Mass Transfer ME302 Steady Heat Conduction Dr Ramjee Repaka  Disclaimer ã This is a reference material only and refer to the text books for complete details ã Material has been taken from different sources and efforts have been made to cite the relevant material  Objectives ã Understand the concept of thermal resistance and its limitations, and develop thermal resistance networks for practical heat conduction problems ã Solve steady conduction problems that involve multilayer plane walls ã Develop an intuitive understanding of thermal contact resistance, and circumstances under which it may be significant ã Identify applications in which insulation may actually increase heat transfer ã Analyze finned surfaces, and assess how efficiently and effectively fins enhance heat transfer References: Cengel and Ghajar, HMT Incropera and Dewitt, Principles of HMT  Steady Heat Conduction in Plane Walls References: Cengel and Ghajar, HMT Incropera and Dewitt, Principles of HMT The rate of heat conduction through a plane wall is proportional to the average thermal conductivity, the wall area, and the temperature difference, but is inversely proportional to the wall thickness. where is the rate of conduction heat transfer and A is the wall area are constant . Thus dT/dx  = constant, which means that the temperature through the wall varies linearly with  x . The Fourier’s law for one -dimensional steady heat conduction through the wall can be expressed as That is, the temperature distribution in the wall under steady conditions is a straight line. Under steady conditions, the temperature distribution in a plane wall is a straight line. Eq. (1) Eq. (2)
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