Experimental investigation of pre-drying data for some medicinal herbs in forced convection

The special active agent content of herbs makes them suitable for healing and health preservation. key element in the processing spices is drying. Before drying, medicinal plants should be stored under appropriate conditions to avoid deterioration quality where one possible methods pre-drying with ambient air. This work defines determination main operational parameters at forced convection drying air like rate, volume decrease, maximum velocity, porosity various (common yarrow ? Achillea collina, giant goldenrod Solidago gigantea, wormwood Artemisia, walnut leaf Juglandis folium, wild carrot Daucus carota). To determine a convective dryer was used average rate common were highest followed by goldenrod, wormwood. Measurements made on pilot plant fluidized bed decrease velocity. determined as function time moisture content. It found that velocity each between 1.8 2.2 m/s. In addition, herb measured an pycnometer.