This paper proposes an analytical based numerical model of a small channel gravity driven two-phase loop. This model is based on the solving of the mass, momentum and energy conservation equations. Suitable correlations and models are used to calculate the pressure drop, void fraction and heat transfer coefficient in the successive sections of the thermosyphon. Then residuals of these conservation equations are evaluated and minimized with a minimization algorithm. The first simulations show as expected the existence of an optimal filling around 50%, the influence of the heat load and the coolant temperature. This model will enable us to predict the heat transfer performances in a gravity driven two-phase loop with various and changing operating conditions.

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