Thermal and electrical performance evaluation of single and double pass photovoltaic-thermal solar collector with cross-flow baffles and varying transparency: A computational analysis
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An experimental study was undertaken of damping produced by single flexible-ring baffles in a 396-cm diameter tank of liquid nitrogen. Two 24.8-cm wide baffles were tested. One baffle was 0.00635 cm thick type 301 stainless steel and the other 0.0254 cm thick Teflon FEP. Each baffle produced damping of liquid oscillations equal to or greater than that expected from rigid baffles of the same size. The equations used to determine the baffle thickness required were found to be adequate baffle design equations.
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With point electric source as example, this paper describes direct current method forward modeling with COMSOL Multiphysics. By comparing and analyzing COMSOL Multiphysics modeling results and theoretic values of typical models, the validity and feasibility of direct current method forward modeling based on COMSOL Multiphysics is proved. Due to the powerful mesh dissection, solution function and abundant post process operation, it shows an important significance of applying COMSOL Multiphysics in geophysical modeling.
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У статті наводиться огляд проблем, що зустрічаються при моделюванні механічних процесів. Так само проведено аналіз застосування модуля «Механіка конструкцій» в програмному середовищі COMSOL Multiphysics для вирішення механічних завдань на прикладі моделі яка представляє собою тонкий металевий лист, який вдавлюється в штамп за допомогою пуансона. При прокаті листового металу явище деформації – є важливим етапом в технологічному процесі. Тому в роботі показана можливість застосування моделювання механічних процесів, як можливість проводити експериментальні дослідження за допомогою COMSOL Multiphysics. Також в роботі поведено аналіз літературних джерел, в яких розглядається питання моделювання механічних і фізичних процесів не тільки в програмному середовищі COMSOL Multiphysics., але і в інших програмних продуктах.
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An advanced Neuro-space mapping (Neuro-SM) multiphysics parametric modeling approach for microwave passive components is proposed in this paper. The electromagnetic (EM) domain model, which represents the EM responses with respect to geometrical parameters, is regarded as a coarse model. The multiphysics domain model, which represents the multiphysics responses with respect to both geometrical parameters and multiphysics parameters, is regarded as a fine model. The proposed model is constructed by the input mapping, the output mapping and the coarse model. The input mapping is used to map multiphysics parameters to EM parameters. The output mapping is introduced to further narrow the gap between the output of the coarse model and the multiphysics data. In addition, a three-stage training method is proposed for efficiently developing the proposed multiphysics model. The proposed technique, which combines the efficiency of EM analysis and the accuracy of multiphysics analysis, can achieve better accuracy with less multiphysics data than existing modeling methods. The developed Neuro-SM multiphysics model provides accurate and fast predictions of multiphysics responses. Therefore, the design cycle of microwave passive components is shortened while the modeling cost is significantly reduced. Two microwave filter examples are utilized to demonstrate the accuracy of the proposed parametric modeling technique.
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The use of baffles in sewer systems enables the capture of floatables, which could be responsible for both malfunctioning of water treatment plants and aesthetic pollution of receiving bodies when discharges through combined sewer overflow devices occur. An experimental contribution to the understanding of capturing processes of floatable elements by means of baffle devices is presented in this paper. Experiments were carried out using different baffle configurations. The limit equilibrium conditions of various types of floatables, i.e the condition beyond which upstream intercepted floatables start to escape the baffle, were investigated. The dimensional analysis was used in order to generalise the results of the experiments and to compare the capturing performances of analysed baffle configurations.
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