Heat Transfer From Condensing Vapors

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Chapter: Pharmaceutical Engineering: Heat Transfer

When a saturated vapor is brought into contact with a cool surface, heat is transferred to the surface and a liquid condenses.


HEAT TRANSFER FROM CONDENSING VAPORS

When a saturated vapor is brought into contact with a cool surface, heat is transferred to the surface and a liquid condenses. The vapor may consist of a single substance or a mixture, some components of which may be non-condensable.

The process is described by the following sequence: The vapor diffuses to the boundary where actual condensation takes place. In most cases, the con-densate forms a continuous layer over the cooling surface, draining under the influence of gravity. This is known as film condensation. The latent heat liberated is transferred through the film to the surface by conduction. Although this film offers considerable resistance to heat flow, film coefficients are usually high.

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