Modeling of heat and mass transfer in the liquid film of rotating heat pipes

Transient Modelling of Rotating and Stationary Cylindrical Heat Pipes: An Engineering Model

“…where the first equation is the no-slip boundary condition at the inner wall [23][24][25], the second equation is the negligible shear stress boundary condition at the liquid/vapor interface [24,36] and the third equation describes the average velocity as the velocity profile integrated over the liquid film divided by the cross-sectional area.…”

“…For RHPs, steady-state modelling has been extensively addressed [23][24][25], with recent studies focusing on the use of nanofluids [26,27]. On the other hand, transient modelling studies are scarce.…”

“…The pressure drop of the vapor is much smaller than the pressure drop of the liquid along the heat pipe [21,24,32]. • For rotating heat pipes without a wick structure, the thermal conduction through the liquid in the axial direction is neglected [23][24][25].…”

“…For the liquid component of the rotating heat pipes without a wick structure, the heat transfer in the radial direction is taken to be dominant over the heat transfer in the axial direction [24,25,28].…”

Azimuthal instability modes in a viscoelastic liquid layer flowing down a heated cylinder

“…When a film is flowing down the outside of a rotating cylinder, it has been shown [25][26][27] that the first azimuthal mode may be the most unstable one under different circumstances. Nevertheless, for flow inside the cylinder (as in [28]) the most unstable mode is the axial one. The relevance of the azimuthal modes is also found in the instability of inviscid stratified fluids in a rotating annulus [29].…”