ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
HEAT TRANSFER PROBLEMS IN DRYING
Аннотация
Drying of solids is a ubiquitous operation that
provides a kaleidoscope of several interacting thermal
and mass transfer phenomena. At the microscopic level
the most general case involves transient coupled heat
and mass transfer with change of phase in porous media
accompanied by chemical or biochemical reactions.
Both heat and moisture transfer may occur by different
mechanisms (e.g. conduction, convection, radiation or
volumetric dielectric heating for heat transfer, and
liquid/vapor diffusion, surface diffusion, Knudsen
diffusion or capillarity for moisture transfer) which
may act individually, concurrently or consecutively
depending on the product and type of dryer. This paper
attempts to present a tutorial overview of the nature and
scope of thermal problems encountered in conventional
and emerging drying technologies with special reference
to drying of paper and drying of particles and droplets
in dispersed phase.