Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

0.0176G1.37

1.004G0.8

HG = 0.0176G0.37

HG = 1.004G0.37

0.0176G1.37

1.004G0.8

HG = 0.0176G0.37

HG = 1.004G0.37

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Hydrostatic head is required for refluxing the condensate

Sub cooling of condensate is desired

Only the function of condensation is to be carried out

Both the functions of condensation & sub cooling are carried out in a single unit

Hydrostatic head is required for refluxing the condensate

Sub cooling of condensate is desired

Only the function of condensation is to be carried out

Both the functions of condensation & sub cooling are carried out in a single unit

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Process Equipment and Plant Design
Value of Peclet number = ∞, is the representative of

Complete back mixing

Laminar flow

Eddy diffusivity = 0

Plug flow

Complete back mixing

Laminar flow

Eddy diffusivity = 0

Plug flow

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Process Equipment and Plant Design
Length to diameter ratio of most rotary driers is in the range of

20 to 30

10 to 20

4 to 10

1 to 2

20 to 30

10 to 20

4 to 10

1 to 2

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Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Permit release of entrained vapour in the liquid

Cool the liquid before it flows down

Reduce the discharge fluctuation

Ensure better vapour-liquid contact

Permit release of entrained vapour in the liquid

Cool the liquid before it flows down

Reduce the discharge fluctuation

Ensure better vapour-liquid contact

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Process Equipment and Plant Design
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Vapour & liquid load both

Running cost of cooling water for condenser

Running cost of steam for reboiler

Fixed charges initially

Vapour & liquid load both

Running cost of cooling water for condenser

Running cost of steam for reboiler

Fixed charges initially

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Process Equipment and Plant Design

Process Equipment and Plant Design Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Process Equipment and Plant Design Value of Peclet number = ∞, is the representative of

Process Equipment and Plant Design Length to diameter ratio of most rotary driers is in the range of

Process Equipment and Plant Design A claming section before the liquid flows into the downcomer is privided to

Process Equipment and Plant Design With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Process Equipment and Plant Design
Value of Peclet number = ∞, is the representative of

Process Equipment and Plant Design
Length to diameter ratio of most rotary driers is in the range of

Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Process Equipment and Plant Design
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.