High performance heat dissipation = heat transfer coefficient X heat dissipation area X temperature difference Heat transfer coefficient: material properties, geometry, flow field conditions (laminar flow, turbulent flow) Selection of heat dissipation material: Heat sink design focus: Overall heat dissipation surface area (P/h*(Ti-Tj), basic >60 cm 2 /W)
Heat dissipation area: manufacturing processing method, geometric temperature difference: geometric shape, flow field condition 
Material (aluminum extruded AL6063, die cast ADC12, finAA1050)
Floor thickness (generally >4mm, T=7xlogW-6 (min 2mm))