NUMERICAL INVESTIGATION HEAT TRANSFER OF ROTARY DRYER OLIVE LEAF DRYING USING COMPUTATIONAL FLUID DYNAMICS METHOD

The conventional drying process for olive leaves is done in the sun. The drying capacity is relatively small over a long period. This process can be improved by using a rotary dryer. To determine optimal drying conditions in the temperature range of 30-45 [ºC], it is necessary to carry out numerical analysis using the Computational fluid dynamics method with varying heating temperatures of 30, 40, 50, and 60 [ºC]. The total heat energy transferred from the heater to the olive leaves by convection is 366,252 [kJ/s] and 21,371 [kJ/s] by conduction with a rotary dryer rotation speed of 75 [rpm]. The drying temperatures resulting from these four variations are 25.65, 26.85, 29.55, and 31.35 [ºC] with a heat flux of 2.542 x 10-6 [W/m2]. The heating temperature of the rotary dryer set at 60 [ºC] can distribute the heat of 1.8 [M.J.], resulting in an optimal olive leaf drying temperature of 31.35 [ºC].