Convection

$${\dot{q}}_w=\alpha (T_w-T_{\infty })$$

• $\dot{q}$ Wärmestromdichte
• $T_w$ Wall Temperatur
• $T_{\infty }$ Fluid Temperatur at sufficiently large distance from the wall
• $\alpha$ Heat Transfer Coefficient

Grenzschicht / Boundary Layer

Bereich wo die Temperatur ansteigt.