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Heat transfer between fluid and particles in aseptic processing
SIK – Institutet för livsmedelsforskning.
1994 (English)In: Journal of Food Engineering, ISSN 0260-8774, E-ISSN 1873-5770, Vol. 21, no 1, 97-125 p.Article in journal (Refereed)
Abstract [en]

The particle heat transfer coefficient, hfp, is one of the critical factors, besides the residence time distribution, that has to be known for the design and development of continuous heat processes of particulate food products. In the present work, data and methods for determining hhp for conditions relevant to aseptic processing have been studied. The influence of product characteristics, such as size and composition of particles, fluid properties, temperature differences and fluid motion, have been investigated. Among the parameters investigated, the flow field around the particles was shown to be the most important for heat transfer but for special conditions the particle size, particle shape or thermal properties of the particle, as well as the apparent viscosity and the thermal properties of the fluid, are equally important for the value of hfp. For safety considerations, the present investigation indicates that hfp values corresponding to an Nu value of 5-6 should be relevant for medium-sized spherical particles transported by a highly viscous liquid. For the quality aspects, different conditions have to be considered. Particles at different positions in·the tube flow will experience different heat transfer. The few particles in the centre of the tube will experience a low heat transfer and hfp values corresponding to Nu values ranging between 5 and 10. The larger amounts of particles are transported in the liquid with a pronounced velocity gradient which yields Nu values of 10-17, while for extreme conditions occurring for sedimented particles, Nu values between 20 and 45 could be expected. © 1993.

Place, publisher, year, edition, pages
1994. Vol. 21, no 1, 97-125 p.
Keyword [en]
Food Engineering
Keyword [sv]
Livsmedelsteknik
National Category
Food Science
Identifiers
URN: urn:nbn:se:ri:diva-8906DOI: 10.1016/0260-8774(94)90098-1OAI: oai:DiVA.org:ri-8906DiVA: diva2:966779
Available from: 2016-09-08 Created: 2016-09-08Bibliographically approved

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CiteExportLink to record
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