ABSTRACT
This chapter demonstrates microscale foundations of well-known heat transfer correlations. It introduces models based on micro-scales, and correlates additional experimental data. The chapter begins with forced convection and terminates with natural convection. The fact that any velocity gradient makes a layer of inviscid flow unstable (Kelvin-Helmholtz instability). Under the influence of viscosity, the layer becomes stable within the dissipation layer over a boundary. The friction coefficient for turbulent flows is usually available from the correlation of experimental data. However, in tune with the philosophy of present monograph, a model based on the local dissipation scales is constructed. Because of wide scatter in experimental literature, there are a number of correlations on liquid metal heat transfer. The data should distinguish the surface wetting and nonwetting liquid metals, should explicitly include the effect of Prandtl number, and should be correlated with an improved model.
