Convection overview(Contd) Same principal applies to any arbitrary shape, not Just a flat plate Average convection heat transfer coefficient hdA. or, for unit width hdx S So. we need to know how h varies with x. the distance from the leading edge What do you think key parameters that might influence h? Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 6 Convection overview (Cont’d) • Same principal applies to any arbitrary shape, not just a flat plate • Average convection heat transfer coefficient: So, we need to know how h varies with x, the distance from the leading edge…….. What do you think key parameters that might influence h? q  dAs As Ts , or, for unit width:  = As s s hdA A h 1  = L hdx L h 0 1