流体力学与传热（伍钦）refresher course.pptVIP

Forced convection heat transfer outside pipes (without phase change) Heat transfer coefficient for fluid flowing normal to tubes Flow past banks of tubes Flow Parallel to Flat Plate For laminar flow For turbulent flow Natural convection Density differences in the fluid arising from the heating process provide the buoyancy force required to move the fluid. Heat transfer with phase change Boiling Effects of temperature difference on the coefficient Vapor condensation dropwise condensation film condensation Log Mean Temperature Parallel current flow Countercurrent flow Mean temperature difference with phase change Overall coefficient Correlations influences of resistances on overall heat transfer coefficient Energy balance Energy balance between warm fluids and cold fluids Heat transfer between warm fluids and cold fluids by the wall of metal HEAT EXCHANGERS Tube pass and shell pass Effects of passes on coefficients and mean temperature difference Buffer Influences of on coefficients Difficult heat-exchange problem arise when one of two fluid streams has a much lower heat-transfer coefficient than the other. (extended surface) Provision for thermal expansion Choice of tube-side fluid INTRODUCTION TO RADIATION HEAT TRANSFER fundamental Stefan-Boltzmann law Kirchhoff’s law Nature of fluids Incompressible fluid Compressible fluid Pressure concept Isotropy Scalar Unit reference Fluid statics and its application The equation for hydrostatic equilibrium applications VISCOSITY OF FLUIDS Newtons Law and Viscosity Ideal fluid What is ideal fluid Important characteristics of potential flow shear stress is proportional to the shear rate( velocity gradient) Viscosities of Fluids Effects of temperature on viscosity Gases liquids Newtonian fluids The curve is plots of shear stress vs. rate of shear. Boundary layer the effect of the solid boundary on the flow is confined to a layer of the fluid immediately adjacent to the solid wall. Laminar flow Fluid flows witho