Heat transfer with freezing in a scraped surface heat exchanger

Online ice crystal size measurements during sorbet freezing by means of the focused beam reflectance measurement (FBRM) technology. Influence of operating conditions

“…The scraping action of the dasher improves the heat transfer rate between the freezer wall and the product (Ben Lakhdar et al, 2005). Higher dasher speeds would thus be expected to give lower draw temperatures and smaller ice crystals.…”

Power consumption of a double ribbon impeller with newtonian and shear thinning fluids and during the gelation of a iota-carrageenan solution

“…Some typical situations are solute crystallization , colloid aggregation in suspensions and physical gelation of polymer solutions (Djabourov et al, 1999;Kané et al, 2003;Kané et al, 2004). In the case of physical gelation, these changes frequently take place under shearing conditions in the most common heat exchangers used in the food industry with tubular, scraped or wiped surfaces (Lakhdar et al, 2005;Omari et al, 2003) and agitated vessels. The cooling operations are mainly conducted either by vacuum cooling (Sun and Zheng, 2006) or with the intermediate of a cooling fluid or a condensing gas.…”

Local and global heat transfer coefficients of a stabilised ice slurry in laminar and transitional flows

“…However, other mixtures have been also studied, in particular those based on inorganic products [17e19] or hydrates [20,21]. In order to achieve a solide liquid phase change of this type of slurry, scraped surface [22] or brushed surface [14] heat exchangers are currently used. However, these types of exchangers have several inconveniences regarding the development of such two-phase secondary refrigerants [23,24].…”