MEEN 3210

Chapter 6 introduces the fundamentals of convection, where heat transfer occurs due to fluid motion across a surface. It begins with boundary layers, distinguishing the velocity boundary layer where fluid speed increases from zero to free stream, and the thermal boundary layer where temperature adjusts from the surface value to that of the surrounding fluid. Local and average convection coefficients are defined to quantify surface heat transfer, followed by the use of the Reynolds number to clas...

This chapter explores transient heat conduction, where temperature changes over time. It begins with the lumped capacitance method, which simplifies heat transfer to an exponential decay equation under the assumption of uniform temperature, valid when the Biot number is less than 0.1. The Biot number compares internal conduction to surface convection, and its value determines the validity of different models. The time constant and Fourier number are introduced to quantify the rate of temperature...

This chapter covers two-dimensional steady state heat conduction, starting with Laplace's equation for systems with no internal heat generation. The analytical method introduced is separation of variables, which assumes the temperature distribution can be split into functions of x and y and then solved using boundary conditions. For more complex or irregular problems, the chapter introduces the numerical finite difference method, where the domain is divided into a uniform grid and temperature at...

This chapter focuses on heat conduction through plane walls, composite systems, and the use of extended surfaces called fins to improve heat transfer. It starts by describing one-dimensional steady-state conduction through a wall without internal heat generation, where temperature drops linearly across the wall. The thermal resistance model is introduced, using formulas similar to those in electrical circuits, allowing resistances to be added in series or in parallel for multilayered or composit...