@wikipedia



The simplest models in concentric pipe system are:

Pipe Flow Heat Transfer Coefficient @model

Conductive Annulus Heat Transfer Coefficient @model

Natural Convection Annulus Heat Transfer Coefficient @model

Forced Convection Heat Transfer Coefficient @model



More complicated concentric pipe systems are :

Single-barrier well completion Heat Transfer Coefficient @model

Dual-barrier well completion Heat Transfer Coefficient @model


See also


Physics / Thermodynamics / Heat Transfer /  Heat Transfer Coefficient (HTC)

Thermal conductivity ][ Nusselt Number ] [ Convection Heat Transfer Multiplier ]


Reference


https://www.engineeringtoolbox.com/conductive-heat-transfer-d_428.html



N. Francis, Natural Convection In Horizontal Annulus