Buoyancy is the driving force Buoyancy is due to combination of Differences in fluid densit Body force proportional to density Body forces gravity, also Coriolis force in atmosphere and oceans Convection flow is driven by buoyancy in unstable conditions plr) P P 少0 <0 do中 d r>o fluid motion may be (no constraining surface)or along a surface Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 5 Buoyancy is the driving force • Buoyancy is due to combination of – Differences in fluid density – Body force proportional to density – Body forces gravity, also Coriolis force in atmosphere and oceans • Convection flow is driven by buoyancy in unstable conditions • Fluid motion may be (no constraining surface) or along a surface