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Interaction of Ice-Water Interface With Agglomerates of Activated Sludge During Freezing

[+] Author Affiliations
T. Tao, X. F. Peng

Tsinghua University, Beijing, China

C. P. Chu, D. J. Lee

Taiwan University, Taipei, China

Paper No. HT2003-47431, pp. 541-545; 5 pages
doi:10.1115/HT2003-47431
From:
  • ASME 2003 Heat Transfer Summer Conference
  • Heat Transfer: Volume 1
  • Las Vegas, Nevada, USA, July 21–23, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3693-2 | eISBN: 0-7918-3679-7
  • Copyright © 2003 by ASME

abstract

Visual experiments were conducted to investigate freezing behavior of activated sludge. Experimental observations indicate that there existed strong interactions of advancing ice-liquid interface with sludge agglomerates during freezing treatment. Agglomerates would be pushed to move by advancing ice-liquid interface in the cases of lower advancing speeds while no needle-like ice-crystals forming at the interface. For faster freezing processes, the ice front interface line turned needle-like, while ice-crystals forming/generating at the interface, and crystals pierced into the sludge agglomerates rather than pushing them. The crystals served as roles holding the agglomerates. It seems that there was a critical speed below which repulsion occurred and above which the particles were entrapped without obviously pushing. The transition of these two cases is still needed to identify.

Copyright © 2003 by ASME

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