The sublimation process is frequently used in the chemical industry to separate a volatile component from other non-volatile ones [1-3]. The main purpose of this paper is to develop a phenomenological model to sublimate small and large balls as well as bars and blades of naphthalene fixed in special devices that provide a flat surface in contact with the entraining agent. For this purpose, programs developed in Mathcad were used. The global mass transfer coefficient Kp was determined using a criterion equation of the type: Sh = a + b *Rec * Scd . The parameters in the model (a, b, c and d) were determined for each type of particle. The phenomenological model allowed to determine the naphthalene mass which was lost after a 10second time frame from the beginning of modelling, this time being necessary in order to attenuate the oscillations that could occur upon initiating the calculation. The value of this mass was marked down as dm10 and could be considered as an average value for mass loss under such operating conditions. If it were amplified with the time frame desired, it could serve to compare and verify experimental data that could be affected by experimental errors. A quick prediction of results can thus be made if the initial experimental conditions are known. The criterion equation obtained for each type of particle also allows to calculate the individual mass transfer coefficient. The calculated standard deviations are smaller than 0.04 for the bars, large and small balls and smaller than 0.08 for the blades.