This lecture is the fifth lecture on internal forced convection. It discusses the use of the logarithm mean temperature difference. An overview is also given of the derivation of the Nusselt numbers for the constant heat flux and constant wall temperature cases. The lecture was presented as part of a heat transfer class to the fourth year students of the Department of Mechanical and Aeronautical Engineering by Prof Josua Meyer, Head of the Department of Mechanical and Aeronautical Engineering of the University of Pretoria, South Africa. Lecture was presented on 15 April 2014. The material used is the textbook of Cengel and Ghajar (4th edition).derivation
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