The cleaning of machinery and equipment in the food processing industry is a crucial process step to maintain the product quality. In parallel, the rising demands on the environmental protection and the process efficiency results in a discrepancy between consumer safety and minimal resource usage. The research project dedicates the non-immerged system (e.g. tank cleaning) in which the cleaning is carried out mainly with liquid jets and/or gravity driven falling film. Thereby the established cleaning systems are largely operated continuously, which results in a high consumption of cleaning fluid. So far, potential savings through discontinuous flows have been shown mainly in immerged systems (piping).
In this research project the valuation of discontinuous flows regarding the potential savings of cleaning fluid and cleaning time is intended, with the aim of giving recommendations for food producers and impulses in the development of component manufacturers. Therefore, the two flow areas (jet impingement and falling film) will be considered separately in a first step, thus potential cross-effects can be avoided. In addition, the locally resolved heat transfer will be determined for optimization approach in design of cleaning processes and the determination of flow parameters for the description of their influence on the cleaning. By using two food based model soils the majority of conventional pollution in food plants will be included. Finally the flow regions (falling film/liquid jet) will be merged, so the results can transmitted into real applications. Due to expected results it may be possible to overcome the discrepancy of inconsistent statements for the benefit of discontinuous liquid flows and to promote the industrial application of this resource efficient flow regime.
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The IGF project presented here by the Research Association of the Industrial Association for Food Technology and Packaging (IVLV e.V.) is funded by the Federal Ministry for Economic Affairs and Energy via the AiF as part of the program for the promotion of industrial community research (IGF) based on a decision of the German Bundestag.