Study on the application of cleaning models with high speed water jets to CIP-processes

Abstract

Original scientific paper To meet consumer safety and high product quality there is a need of reliable cleaning processes in the food industry. To keep competitive position it is necessary to control costs of those cleaning in place (CIP) processes e.g. expenses for fresh and waste water, detergents and to minimize downtime of the production facilities. The removal of food soils with water droplet sprays are very little researched, especially the mathematical modelling. In this paper we show that the high pressure model of Leu et al. can be applied to low pressure spray cleaning of a food soil with marginal adaptations. We used an existing analytical model for the relation of cleaned width as a function of the standoff distance and considered the different structure of the water spray as well as a food specific cleaning behaviour. We validated the analytical model with experimental results by varying the equivalent nozzle diameter. Keywords: CIP; cleaning model; spray; water jet Analiza primjene modela za čišćenje s mlazovima vode na CIP postupkeIzvorni znanstveni članak Zbog sigurnosti potrošača i osiguranja visoke kvalitete proizvoda nužno je provesti pouzdane postupke čišćenja u prehrambenoj industriji. Za održavanje konkurentnog položaja potrebno je kontrolirati troškove tih cleaning in place (CIP) postupaka, na primjer troškove za slatku i otpadnu vodu, deterđente, i svesti na minimum vrijeme prekida rada proizvodnih pogona. Čišćenje mrlja od hrane raspršivanjem vode veoma je slabo istraženo, naročito matematički prikaz postupka. U ovom radu pokazujemo da se model visokog tlaka autora Leu et al. može, uz neznatne adaptacije, primijeniti na čišćenje mrlja raspršivanjem vode niskog tlaka. Primijenili smo postojeći analitički model za relaciju čišćene širine kao funkcije standoff udaljenosti i razmotrili različitu strukturu raspršene vode kao i specifično ponašanje mrlje pri čišćenju. Potvrdili smo analitički model eksperimentalnim rezultatima mijenjanjem promjera mlaznice.

Cleaning of toothpaste from vessel walls by impinging liquid jets and their falling films: Quantitative modelling of soaking effects

“…There has been a noticeable increase in research activity on flow patterns and cleaning behaviour associated with a single coherent liquid jet. These studies can be categorised as either: (i) cleaning in the impingement area, where the jet hits the surface and flows radially outwards (Bhagat et al, 2017;Chee et al, 2019;Feldung Damkjaer et al, 2017;Gerhards et al, 2019;Köhler et al, 2016;Rodgers et al, 2018;Wang et al, 2013b); or (ii) cleaning by the falling film that exists below the impingement point, where the liquid flows down under gravity and wets a vertical or inclined wall (Morison and Thorpe, 2002;Wang et al, 2013a). Wilson et al (2012) presented a simple model of the radial flow region to predict the hydraulic jump radius and the minimum width of the falling film based on momentum balances.…”