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Experimental testing of minimixer for waste water treatment
Luňák, Pavel ; Štefan, David (referee) ; Rudolf, Pavel (advisor)
This thesis deals with various ways of mixing mainly liquids. The theoretical part is devoted to the distribution of mixers, including a description of their characteristics, advantages, disadvantages and applications. The experimental part is devoted to the measurement of minimixers, which were developed and manufactured V. Kaplan Department of Fluid Engineering. This section contains a proposal of measuring ciruit to determine the hydraulic characteristics of minimixers and the degree of mixing. The measurement results and their evaluation is summarized in the conclusion.
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Design of Hand Blender
Kalenský, Ondřej ; Buganská, Tamara (referee) ; Sládek, Josef (advisor)
This bachelor‘s thesis deals with the design of ahand blender. The main problems it covers are designing with consideration to blind and old people, clear and natural control and more options for holding the device. The thesis discovers the essence of the process of blending and whisking. Based on this knowledge, the ambition behind the design of the product is to form anew shape which is in harmony with its function. The thesis is marginally focused on the theory of designing and developing anew product and it describes the practical usage of user-friendly design rules.
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LDA measurements and turbulence spectral analysis in an agitated vessel
Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk
During the last years considerable improvement of the derivation of turbulence power spectrum from Laser Doppler Anemometry (LDA) has been achieved. The irregularly sampled LDA data is proposed to approximate by several methods e.g. Lomb-Scargle method, which estimates amplitude and phase of spectral lines from missing data, methods based on the reconstruction of the auto-correlation function (referred to as correlation slotting technique), methods based on the reconstruction of the time series using interpolation between the uneven sampling and subsequent resampling etc. These different methods were used on the LDA data measured in an agitated vessel and the results of the power spectrum calculations were compared. The measurements were performed in the mixing vessel with flat bottom. The vessel was equipped with four baffles and agitated with a six-blade pitched blade impeller. Three values of the impeller speed (Reynolds number) were tested. Long time series of the axial velocity component were measured in selected points. In each point the time series were analyzed and evaluated in a form of power spectrum.
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Transportní charakteristiky různých vícemíchadlových konfigurací v míchané disperzi kapalina-plyn s vyšší viskositou
Moucha, T. ; Zedníková, Mária ; Linek, V.
Mixing intensity, gas hold-up and volumetric mass transfer coefficient of various multiple-impeller configurations are measured in a vessel of inner diameter 0.29 m equipped with three impellers on a common shaft. Five types of impellers are used. Distilled water with 3 vol.% Sokrat 44 is used as a liquid phase with Newtonian behaviour and viscosity 12.9 mPa.s. Air is used as gas phase. Mixing intensity was measured using tracer experiment and Dynamic Pressure Method was used for the measurement of volumetric mass transfer coefficient. Transport characteristics are presented for individual impeller configurations as functions of power consumption and superficial gas velocity. The impellers are compared each other and with transport characteristics for non-viscous solutions measured previously.
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