Q. Constant drying conditions include

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Q. Calculate the flux (kg/sq.m sec) if

Mass of dry solid = 8 kg; Wet surface area = 4 sq.m; Change in moisture content with time is 0.4 /sec;

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Q. The other part than the constant rate period in the Batch- Drying curve is falling rate period.

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Q. Find the gas phase mass transfer co-efficient for a unbound moisture to remove if the flux is 5 kg/sq.m sec and the difference in humidity of the liquid and the main stream is 0.5 units.

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Q. The value of _________ remains constant while drying if speed and direction of gas flow never change.

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Q. If the dry spot appears in the substance in the batch drying curve at ___________

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Q. After critical moisture content _________ starts.

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Q. After the unsaturated drying completed ________ starts to evaporate.

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Q. Find the time taken to dry 50% to 40% of moisture (dry basis) if critical moisture content is 30%. If the weight of the wet solid is 5 kg and the product of area and the constant rate is 0.5 kg/min.

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Q. Find the period if the initial and the final moisture content are 60% and 40%. Also the critical moisture content is 30%.

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Q. Find the period if the initial and the final moisture content are 50% and 20%. Also the critical moisture content is 30%.

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Q. At the constant drying period of a batch process, the rate of drying varies accordingly.

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Q. Find the change in moisture content from the given data.

Given data:

Time for drying= 6 sec
Area * Constant rate = 8 kg per sec
Weight of wet solid = 100 kg

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Q. Find the initial moisture content for the batch process if the final moisture content is 25% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period)

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Q. Find the final moisture content for the batch process if the initial moisture content is 75% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period)

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Q. Falling rate period of a batch process starts at

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Q. If the time taken for the moisture removal is obtained from the formula

Time = Ss(Xc – Xe)/ Nc * A ln ((X1-Xe)/(X2-Xe))

then the falling curve will be curves symmetrically

Where, Ss= Wet solid weight
Xc,Xe- constant & equilibrium moisture content
X1,X2 – initial and final moisture content

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Q. There will be a change in the rate of drying of a batch process after the constant drying process.

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Q. Falling rate period of the batch drying curve = _______ + ___________

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Q. Find the region if the final and the initial moisture content are 40% and 30% (Dry basis) and the critical moisture content is 45%.

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