The paper addresses theoretical and modeling issues of micro heatpipes with parallelepipedal shape with regard to the capillary limit and the evaporator boiling limit. In particular, the well-established Faghri model is employed to simulate the heat transfer capability of selected heat pipes developed and tested at the Laboratory of Electrotechnique of Grenoble. An improved model is suggested and it is compared with the simulation and experimental results. The improved model implements a different analytically derived form of the friction factor-Reynolds number product in the Faghri model. The simulated results with the proposed model demonstrate better coherence to the experiment showing the importance of accurate physical modeling to heat conduction behavior of the heat spreader.
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