科研之友
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摘要
Purpose: The purpose of this paper was to record and mutualy correlate mass changes of population of micro-granules ofrye starch and effective dielectric permittivity of this system taking places during humidification and drying processes.Design/methodology/approach: Mass changes of biopolymeric mirco-granular sample occuring during itsexposition on saturated water vapour at room temperature, was recorded in the time by means of precise torsionalbalance equipped with special chamber. The same was done in case of drying. Monitoring of effective dielectricpermittivity was performed by means of interdigit comb capacitor and precise RLC meter equipped with PCprogram. Specially designed and constructed measuring chamber was applied to control temperature and relativehumidity (RH %) of ambient sample atmosphere.Findings: Interdigit dielectric spectroscopy method turned out to be more sensitive technique to follow detailsof humidification as well as drying processes. Correlation of changes of effectife dielectric permittivity withsimultaneously occurring mass increase or decrease can be a way to describe the humidification and dryingprocesses of micro-granular biopolymeric sample.Practical implications: Effective dielectric permittivity monitoring of humidification and drying processesturned out to be much more selective than only gravitational measurement of mass change. For modeling purposecorrelation of both is giving new possibilities of modelling approach.Originality/value: For the first time practically important humidification and drying processes were monitoredin statu nascendi, without disturbing geometry of granules starch by means of 汍＊ values evolution record. It wasenabled by application of interdigit comb capacitor as sensing unit.
