Heat transfer with freezing in a scraped surface heat exchanger.
Author(s) : BEN LAKHDAR M., CERECERO R., ALVAREZ G., et al.
Type of article: Article
Summary
An experimental study was carried out on a scraped surface heat exchanger used for freezing of water-ethanol mixture and aqueous sucrose solution. The influence of various parameters on heat transfer intensity was established: product type and composition, flow rate, blade rotation speed, distance between blades and wall. During starting (transient period) the solution is first supercooled, then ice crystals appear on the scraped surface (heterogeneous nucleation) and no more supercooling is observed. It seems that, when blades are 3 mm far from the surface, a constant ice layer is formed having this thickness and acting as a thermal resistance. But when the blades rotate at 1 mm from the surface, periodically all the ice layer is removed despite the fact that the surface is not really scraped. This could simplify ice generator technology. An internal heat transfer coefficient was defined; it depends mainly on rotation speed. Correlations were proposed for its prediction, which could be applied, at least as a first approach, for the most common freezing applications of scraped surface heat exchanger i.e. ice creams (which are derived from sucrose solutions) and two-phase secondary refrigerants (which are principally ethanol solutions).
Details
- Original title: Heat transfer with freezing in a scraped surface heat exchanger.
- Record ID : 2005-1737
- Languages: English
- Source: Applied Thermal Engineering - vol. 25 - n. 1
- Publication date: 2005/01
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Indexing
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Themes:
Heat transfer;
Mass transfer - Keywords: Scraped-surface heat exchanger; Correlation; Calculation; Research; Aqueous solution; Sugar; Expérimentation; Ethanol; Freezing
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- Date : 2001/03/28
- Languages : English
- Source: Rapid Cooling of Food.
- Formats : PDF
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- Languages : English
- Source: International Journal of thermal Sciences - vol. 45 - n. 8
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- Date : 2008/07/14
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- Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
- Formats : PDF
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- Author(s) : ROOS Y., KAREL M.
- Date : 1991/08/10
- Languages : English
- Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
- Formats : PDF
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