Yearbook 2013/2014 - ehedg

International Hygienic Study Award 2012 129
layers within a liquid environment, in real time, as they are
removed, enabling the influence of solution temperature,
composition and shear stress to be quantified between
or within experiments. It is shown to offer significant
improvements over previous fluid dynamic gauge
(FDG) variants, including improved resolution (±5 µm),
reproducibility, automation, data quantity and the ability to
generate topographical images.
The sFDG is used to study the stages of swelling and
removal during the cleaning of gelatine, egg yolk, starchbased
and oil/albumin layers. The FDG technique could
also be applied to several novel applications, including
the study of crossflow microfiltration and fragile biofilms. A
second-generation sFDG, optimised for cleaning studies
within an industrial research laboratory, has been designed,
constructed and commissioned. This technology transfer will
allow the technique to contribute toward future developments
in commercial dishwasher formulations.
Winner of 2nd prize:
Dr. Ing. Martin Schöler, University of Dresden
Analysis of cleaning procedures for complex geometries
in immerged systems
Abstract: Industrial cleaning processes are of great
importance for ensuring hygienic production conditions.
Furthermore, they represent a target for economic
optimisation due to their high consumption of energy and
natural resources. To improve the efficiency of cleanin-place
systems (CIP) it is essential to understand the
mechanisms controlling complex cleaning processes. The
investigation of cleaning phenomena shows two major
difficulties. First, there is a need for parameters that can
provide comparability between investigations that are
currently isolated because they have used different material
combinations or different experimental setups. Second,
the availability of monitoring methods to investigate
these phenomena is limited. In this work the novel local
phosphorescence detection (LPD) method is presented to
investigate the cleaning performance. It combines the use
of complex cohesive food soil, complex pipe geometries
and continuous observation of the cleaning progress to
investigate the mechanisms of cleaning in immersed CIP
systems. Cleaning tests on a sudden expansion were
compared to soil and swelling investigations, as well as CFD
results conducted by other scientists. It was shown that the
tested cleaning configuration was controlled by the mass
transfer of the detached parts of the soil. The mathematical
parameters provided can help to determine the apparent
cleaning mechanisms based on soil characteristics and the
conditions of fluid flow.
Interested in taking part in the Hygienic
Study Award 2013?
Next year, drinktec in Munich will host the award ceremony.
Interested research and university institutes are requested
to contact Prof. Dr. Jens-Peter Majschak, TU Dresden
(jens-peter.majschak@tu-dresden.de). drinktec 2013 –
the world‘s leading trade fair for the beverage and liquid
food industry – will take place from September 16 through
September 20 at Munich Trade Fair Centre. Deadline for
submitting abstracts is June 30, 2013.
Consult www.hygienic-processing.com to get full abstracts of
the studies awarded.