Characterization of the effectiveness of anti-scalants in suppressing scale deposition on a heated surface

Xianhui Li, Hilla Shemer, David Hasson*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A widely used technique for controlling scale deposition in desalination practice is by dosage of anti-scalants. Fundamental techniques for assessing the relative effectiveness of different anti-scalants are of considerable interest. The objective of the present research was to extend a technique characterizing the effectiveness of anti-scalants by identifying the threshold concentration at which scale deposition is unaffected by transport hydrodynamics and is purely surface controlled. A lower threshold level denotes higher inhibition effectiveness. The system investigated consisted of an electrically heated annular flow heat exchanger enabling measurement of calcium sulfate scale deposition on a stainless steel heating surface at a constant surface temperature. Application of the technique is illustrated by scale deposition measurements performed at varying Reynolds numbers in the absence and presence of three anti-scalants and at different scale deposition temperatures.

Original languageEnglish
Pages (from-to)38-42
Number of pages5
StatePublished - 1 Nov 2016
Externally publishedYes


  • Calcium sulfate
  • Heat exchanger
  • Mass transfer control
  • Scale inhibition
  • Surface control


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