Heat transfer and pressure drop in ice-water slurries

✍ Scribed by B.D. Knodel; D.M. France; U.S. Choi; M.W. Wambsganss

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 362 KB
• Volume: 20
• Category: Article
• ISSN: 1359-4311
• DOI: 10.1016/s1359-4311(99)00046-0

✦ Synopsis

Heat transfer and pressure drop were experimentally investigated for ice-water slurries ¯owing turbulently in a 24.0 mm internal diameter, 4.596 m long, horizontal, stainless steel tube. The slurry velocity of the experiments was varied from 2.8 to 5.0 m/s which encompassed the range of applicability to ice-water slurry-based district cooling systems. The previously reported phenomenon of ¯ow relaminarization in ice-water slurries was observed in the current experiments. A reduction in frictional pressure drop associated with the ¯ow relaminarization was measured as the ice fraction increased. An ice fraction of 4% marked a division in the rate of reduction, and a pressure-drop correlation equation was developed for ice fractions above 4%. Heat transfer coecients were determined over the velocity range of the experiments. Consistent with the ¯ow relaminarization, the heat transfer coecient decreased with increasing ice fraction. A correlation equation was also developed for heat transfer coecients at ice fractions above 4%.