Diplomové práce - 12118
http://hdl.handle.net/10467/3098
2022-05-28T13:16:16ZExperimentální zařízení pro pozorování toku suspenze v trubce
http://hdl.handle.net/10467/99258
Experimentální zařízení pro pozorování toku suspenze v trubce; Experimental stand for observation of a suspension flow in a pipe
Harish Balakrishnan
V práci byla zpracována literární rešerše zaměřená na zařízení pro měření rychlostních, koncentračních a teplotních profilů. Na základě rešerše bylo navrženo experimentální zařízení, které umožní měřit požadované parametry v suspenzi s balotinou proudící potrubím. Zařízení je navrženo tak, aby bylo přenosné, snadno rozšiřitelné a jsou u něj detailně definovány všechny parametry (rozměry, měřicí rozsahy senzorů, průtoky, tlaky, ventily a konstrukční části).; A review of the literature is conducted for a device that measures velocity, concentration, and temperature profile. The measurement instrument must be capable of measuring the requisite attributes of a glass bead particle suspended in water while flowing through a pipe. An experimental stand is constructed to measure the required qualities based on a literature search. Finally, the planned experimental stand should be portable in size, with all elements clearly described (dimensions, sensor measurement ranges, flowrates, pressure, valves, and constructional parts).
2022-01-28T00:00:00ZOptimalizace přenosu tepla mezi proudem tekutiny a teplosměnnou plochou
http://hdl.handle.net/10467/99257
Optimalizace přenosu tepla mezi proudem tekutiny a teplosměnnou plochou; Optimization of heat transfer between fluid stream and heat transfer surface
Kaan Ege Temiz
The use of modified surfaces to improve heat transfer is quite common. When examined from a technological and economic point of view, modifying the heat transfer surface with pits is one of the most suitable techniques. After various simulations, it has been observed that the use of these surfaces in impinging jet flows negatively affects heat transfer. On the other hand, with the selection of the right geometries and parameters, it has been determined that there is an improvement in heat transfer thanks to these surfaces in wall jet simulations. However, in order to take into account the pressure drop variation, which is another important factor other than the heat transfer coefficient, the performance evaluation factor, the JF Factor, was calculated and used as a comparison parameter.; The use of modified surfaces to improve heat transfer is quite common. When examined from a technological and economic point of view, modifying the heat transfer surface with pits is one of the most suitable techniques. After various simulations, it has been observed that the use of these surfaces in impinging jet flows negatively affects heat transfer. On the other hand, with the selection of the right geometries and parameters, it has been determined that there is an improvement in heat transfer thanks to these surfaces in wall jet simulations. However, in order to take into account the pressure drop variation, which is another important factor other than the heat transfer coefficient, the performance evaluation factor, the JF Factor, was calculated and used as a comparison parameter.
2022-01-28T00:00:00ZIntenzifikace promíchávání a homogenizace kultivačního média v deskovém fotobioreaktoru
http://hdl.handle.net/10467/99255
Intenzifikace promíchávání a homogenizace kultivačního média v deskovém fotobioreaktoru; Intensification of mixing and homogenization of culture medium flow in a flat panel photobioreactor
Tomáš Vonka
Teoretická část diplomové práce popisuje možnosti využití mikrořas a jejich kultivaci v otevřených a uzavřených systémech. Dále je popsáno využití vestaveb v deskovém fotobioreaktoru pro zlepšení kultivace. Praktická část spočívá v popisu proudění v deskovém fotobioreaktoru pomocí numerických simulací. Na základě výsledků je navržena vestavba a je zkoumán její vliv na proudění.; The theoretical part of this thesis describes the possibilities of using microalgae and their cultivation in open and closed systems. The use of special mixers in a plate photobioreactor to improve cultivation is also described. The practical part consists of the description of the flow in the plate photobioreactor using CFD. Based on the results, the special mixer is designed and its impact on the flow is inspected.
2022-01-28T00:00:00ZCFD simulace usazování malých částic
http://hdl.handle.net/10467/96969
CFD simulace usazování malých částic; CFD simulation of sedimentation of small particles
Özgür Tarik Kaplan
The present work focused to find optimal time steps and model setup for the CFD simulation of sedimentation of small particles and performed analysis on real lamella geometry to observe effectiveness for different factors, like inclination angles and velocity magnitudes. The work of this thesis has been conducted by CFD analysis in ANSYS Fluent software. The preliminary analyses ran with the Euler-Granular and DDPM-KTGF models. The obtained data have been compared for various time steps and their error rates % to reduce the analysis time by calculating the grid convergence index. The similarity analysis has been done and compared with real-sized particle experiment data so that bigger-sized particles could be used to decrease computational requirements. The effect of different inclination angles and velocity magnitudes for laminar and turbulent regimes on the lamella geometry was observed for bigger-sized particles. The sedimentation effectiveness of the lamella geometry according to the ratio of particles leaving the outlet was evaluated. The critical velocities have been calculated for specific effectiveness, 99 %. The study can be improved by widening the number of analyses to find the optimum inclination angle and velocity for the desired design of a lamella clarifier. The lamella clarifier process can be faster by using a two-step lamella clarifier. The first clarifier tank can have a higher velocity magnitude to reduce the number of particles faster during the first step and the second clarifier tank can have the optimal velocity to obtain higher effectiveness for the device.; The present work focused to find optimal time steps and model setup for the CFD simulation of sedimentation of small particles and performed analysis on real lamella geometry to observe effectiveness for different factors, like inclination angles and velocity magnitudes. The work of this thesis has been conducted by CFD analysis in ANSYS Fluent software. The preliminary analyses ran with the Euler-Granular and DDPM-KTGF models. The obtained data have been compared for various time steps and their error rates % to reduce the analysis time by calculating the grid convergence index. The similarity analysis has been done and compared with real-sized particle experiment data so that bigger-sized particles could be used to decrease computational requirements. The effect of different inclination angles and velocity magnitudes for laminar and turbulent regimes on the lamella geometry was observed for bigger-sized particles. The sedimentation effectiveness of the lamella geometry according to the ratio of particles leaving the outlet was evaluated. The critical velocities have been calculated for specific effectiveness, 99 %. The study can be improved by widening the number of analyses to find the optimum inclination angle and velocity for the desired design of a lamella clarifier. The lamella clarifier process can be faster by using a two-step lamella clarifier. The first clarifier tank can have a higher velocity magnitude to reduce the number of particles faster during the first step and the second clarifier tank can have the optimal velocity to obtain higher effectiveness for the device.
2021-08-28T00:00:00Z