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Abstract
Agricultural products are highly perishable and drying of the product after harvest has been proved as one of the methods to minimize postharvest losses. Different studies have been conducted to evaluate the performance of a rotary dryer for drying of agricultural products. The advantages and the challenges of rotary dryers in drying of agricultural products are discussed. This study discusses the effects of product and drying air properties, and dryer design and operation parameters, on dryer performance and product quality. Rotary dryers are capable of processing a variety of agricultural products with a wide range of thermo-physical and flow properties. Rotary dryers have been used for drying of grains, beans, nuts, vegetables, herbs, woody biomass, animal feeds, agricultural wastes, and by-products. This review paper summarizes the advances in the application of rotary dryers in drying of different agricultural products and recommends future research into the use of rotary dryers to improve the efficiency of the drying process.