During constant rate drying period, vaporisation rate per unit drying surface area

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• A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls /ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))
• A 25 cm × 25 cm × 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m × 1m × 1cm flat sheet of the same material is to be dried from one side only. Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
• In the constant rate period of the rate of drying curve for batch drying,
• The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid).
• Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
• With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible.
• During constant rate period, the rate of drying decreases with the
• During the constant rate period of drying of a solid,
• Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
• Which of the following assumes constant molal vaporisation and overflow?