When natural convection is important Weather events such as a thunderstorm Glider planes · Radiator heaters Hot air balloon Heat transfer with pipes and electrical lines Heat flow through and on outside of a double pane window Just sitting there Oceanic and atmospheric motions Coffee cup example Small velocity Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 3 When natural convection is important • Weather events such as a thunderstorm • • Glider planes • Radiator heaters • Hot air balloon • Heat transfer with pipes and electrical lines • Heat flow through and on outside of a double pane window • Just sitting there • Oceanic and atmospheric motions • Coffee cup example …. Small velocity