Prediction of the temperature field in flat plate heat pipes with micro-grooves – Experimental validation

Investigation of Evaporation and Condensation Processes Specific to Grooved Flat Heat Pipes

“…This model was already presented in a previous article (Lefèvre et al, 2008). Besides, a modified version of the model is developed to estimate evaporation and condensation heat transfer coefficients through parameter estimation.…”

“…These heat transfer phenomena are taken into account through different thermal resistances in the nodal model presented in Fig 1 Longitudinal heat conduction through the FPHP envelop is modeled by the thermal resistance R th,long that can be calculated considering the geometry of the FPHP (Lefèvre et al, 2008) or estimated through a parameter estimation method by comparison of the model with temperature measurements obtained when the FPHP is empty. In that case, the transversal thermal resistances vanish from the model.…”

“…The shape of the liquidvapor interface in the capillary structure is supposed to be known. It can be either calculated using a hydrodynamic model (Lefèvre et al, 2008) or determined experimentally (Rullière et al, 2007 …”

“…Indeed, in normal working conditions, a FPHP must have a small thermal resistance to minimize the temperature difference between the heat sink(s) and the heat source(s). Some authors have developed refined thermal models of FPHP (Khrustalev and Faghri, 1999;Kim et al, 2003;Lefèvre et al, 2008). Similarly to the hydrodynamic models, thermal models are derived from micro heat pipe models Faghri, 1994 &1995).…”

“…In a previous article (Lefèvre et al, 2008), we have presented a coupled hydrodynamic and thermal model of a grooved flat heat pipe. The accommodation coefficient was included in the model to calculate heat transfer coefficients at the liquid-vapor interface.…”