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- W3199730266 abstract "This experimental research was performed for the measurement-based detection and numerical simulation of a biological multiphase flow in a fermentation tank. The difficulties of an investigation are the many complex interactions between the different three phases (yeast as solid, carbon dioxide as gas, wort as liquid). One of the main difficulties is, that the natural convection processes are superimposed by rising gas bubbles in a high turbid fluid. Due to the various problems in optical measurement (e.g. PIV, LDA) the measurement is realised with acoustic sensors, so-called transducers. For a detailed understanding of the results of the acoustic measurement and the associated interpretation of the heat and mass transfer, high demands are on the acoustic measurement technology and the subsequent evaluation due to the real multiphase flow. These requirements are further complicated by the combination of several transducers and the targeted conversion of the measurement technology from a 1D acoustic measurement method to a 2D flow field measurement system. Furthermore, it is shown how problems of the acoustic measurement technology, caused by the multiphase flow, can be solved. The systematic investigation and improvement of the measurement technique allows the direct correlation of the measured temperature fields with the flow fields of the acoustic measurement technique. This combination of temperature and velocity allows the heat transfer of the yeast from the inside to the liquid and the cooling from the outside to the liquid to be analysed and investigated in detail. Finally, the influence of the different phases (yeast as solid, carbon dioxide as gas, wort as liquid) is evaluated, visualised and the complex interactions of the phases on heat and mass transfer are explained. In addition to acoustic measurements in the fermentation fluid, numerical simulations are used to provide additional insights into the processes in a fermenter. • Measurement of a biological multiphase flow with an acoustic measurement technique. • Temperature field measurement during fermentation in a cylindro-conical fermenter. • Simulation of natural convection during fermentation in a fermenter. • Simulation of gas bubbles and their interaction during fermentation in a fermenter. • Simulation of yeast with the Kinetic Theory of Granular Flow model." @default.
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- W3199730266 date "2021-11-01" @default.
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- W3199730266 title "The heat and mass transfer of a fermenting multiphase flow using acoustic measurement technology and numerical methods" @default.
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- W3199730266 doi "https://doi.org/10.1016/j.applthermaleng.2021.117552" @default.
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