ITEMS

modern scholarly publishers in the finest tradition

	Search

Annual Reviews of Heat Transfer

ISSN 1049-0787

Individual price:

$175.00 (Must be sent to your home address)

You can order single issue or individual article. To purchase a single issue or an individual article as well as to view tables of contents and abstracts click on issue number.

Institutional price:

$349.00

Volumes per year:

various

Year 1992

417 pages

Volume price - $141.00

HEAT AND MASS TRANSFER IN FOULING

S. H. Chan
Department of Mechanical Engineering, The University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA

ABSTRACT

Recent advances in analytical modeling of silica and calcium carbonate depositions on heat exchanger surfaces are reviewed. General physical and chemical processes leading to CaCO₃ fouling are described. The CaCO₃ fouling model assumes that the deposition process is controlled by two processes: the mass transport of ions and molecular species to and from heat transfer surface, and the crystallization reaction on the same surface. Analytical predictions of the CaCO₃ deposition flux, the mean, and the profile of the local fouling-layer thickness along a heated plate by a laminar falling film are presented. They are found to be in good agreement with experimental data. Good agreement is also shown when applied to a turbulent annulus flow system. Similarly, physical and chemical processes pertinent to silica fouling are reviewed. Silica deposition models that account for supersaturation, pH factor, salinity, and thermal-hydraulic effects are presented. Analytical predictions are made and results are then compared to the field and laboratory data.