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A double drum dryer working under atmospheric pressure was developed for water evaporation rate of 20 kg/h. Potato slurry of 12% solid concentration was dried to obtain potato flakes. Experiments were carried out at drum speed of 5 to 30 rpm, steam pressure 2 to7 kg/cm2 gauge (saturation temperature 120–164 °C) and liquid level 5 to 10 cm at the nip of drums. The responses obtained were, moisture...