Abstract
A double drum dryer working under atmospheric pressure was developed for water evaporation rate of 20kg/h. Potato slurry of 12% solid concentration was dried to obtain potato flakes. Experiments were carried out at drum speed of 5 to 30rpm, steam pressure 2 to7kg/cm(2) gauge (saturation temperature 120-164°C) and liquid level 5 to 10cm at the nip of drums. The responses obtained were, moisture content of the potato flakes: 1.18-44.15% (db), dry matter output rate: 1.33-2.87kg dry solid/h and L value of colour: 30.9-66.4. Steam pressure and drum speed were the most influencing parameters affecting all 3 responses. Optimum combination of operating variables for obtaining potato flakes of 8% (db) moisture content, high dry solid output rate and high L value of colour was: drum speed 19.6rpm, steam pressure 4.3kg/cm(2) gauge (saturation temperature 145°C) and liquid level at the drum nip 6.3cm. At this combination of independent variables, residence time of the product on drum surface would be 2s, final moisture content of product 8% (db), product output rate 2.4kg dry solid/h and L value of colour 53.
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