A theoretical model for fluid flow and heat transfer in a heat pipe with axial “Ω”-shaped grooves was developed and solved numerically to propose the maximum heat transport capability. The model included the effects of the liquid-vapor interfacial shear stress

variation of meniscus radius and contact angle. In the present work

the effect of geometry structure on fluid flow characteristics

the effect of heat load on capillary radius at evaporator end cap

and the effect of wick structure and size on heat transfer performance were analyzed and discussed. The axial distribution of capillary radius

fluid pressure and mean velocity was also proposed. In addition

the calculated maximum heat transport capability of heat pipe at different working temperatures was compared with that from the Chi’s model

in which interfacial shear stress was neglected. And the accuracy of the model was also verified by the experiment.