Authors:Rohit Raja, Amit Saxena Pages: 1 - 6 Abstract: Computational Fluid Dynamics (CFD) seems to be a program that utilizes mechanics, computational mathematics, and computer science technologies to model and simulate how fluid that’s also, gas or liquid, flows. Descriptive and analytical forecasts may be integrated with the aid of CFD, which utilizes computational mathematics methods, computational programming and networking tools to create, grasp, build and then forecast the necessary possibilities. This paper would address a list of concerns on CFD. It will offer a short discussion on the importance of CFD and the pros and cons of applying CFD. The implementation plan would also include a description of the concepts that fall under the framework of the CFD, such as discretion, quantitative grid, input variables, process parameters, sweep, convergence and turbulence simulation. Researchers such as Guang Xu et al. (2017), Raase and Nordström (2015) and Frigg et al. (2009) suggested that CFD is a study of the future, caring for all realms of society in the current and the prospective. CFD technology recognizes fluids primarily air and water as good versus bad, bad because CFD is seeking to come up with a way across air and water to reach the least co-resistance. PubDate: 2021-01-23 DOI: 10.37591/.v10i3.1061 Issue No:Vol. 10, No. 3 (2021)
Authors:Michael Shoikhedbrod Pages: 7 - 18 Abstract: The degassing of liquid fuel and special liquids in spacecraft plays an important and sometimes critical role in the workability of a spacecraft and in the life of astronauts in the space flight conditions. The paper presents the developed methods of degassing liquid fuel or special liquids, which permit to solve the problem of degassing liquid fuel in the fuel tank of a rocket engine and special liquids in the life support system of spacecraft using controlled vibration or a specially created temperature gradient in a liquid, structurally simple, economically highly efficient and productive, mobile, can be used in any blocks of power supply and life support systems of spacecraft for operation both in terrestrial conditions and in space flight conditions. The developed methods of degassing can also be successfully used for degassing crystalline solutions in the process of growing unique crystals in space flight conditions.Keywords: Controlled vibration; Degassing of liquid fuel in the fuel tank of a rocket engine; Degassing of special liquids in the life support system of spacecraft; power supply, Specially created temperature gradient in a liquid; Weightlessness. PubDate: 2021-02-04 DOI: 10.37591/.v10i3.1070 Issue No:Vol. 10, No. 3 (2021)
Authors:Rohit Raja, Amit Saxena Pages: 19 - 23 Abstract: The theoretical fluid dynamics code is used to model the primary natural circulation loop of the proposed small modular reactor for reference to experimental evidence and best-estimated thermal-hydraulic code performance. Latest developments in computational fluid dynamics code simulation capabilities allow them desirable alternatives to the existing cautious method coupled to best guess thermal hydraulic codes and ambiguity assessments. The findings of the numerical fluid dynamics study are compared to the 1:3-long, 1:254-volume, full-pressure and full-temperature small modular reactor test results during steady-state activity and during depressurization. Comparative assessment of the experimental evidence, the results of the thermal hydraulic code and the computational fluid dynamics. The findings offer an opportunity to verify the best-estimated thermal hydraulic code treatment of the natural circulation process and provide insight into the extended use of the computational fluid dynamics framework in potential designs and operations. In addition, a sensitivity review is performed to classify certain physical processes most impactful to the activity of the proposed reactor's natural circulation. The integration of comparative assessment and sensitivity analysis offers tools for improved trust in model improvements for natural circulation loops and improves the efficiency of the thermal hydraulic code PubDate: 2021-01-23 DOI: 10.37591/.v10i3.1062 Issue No:Vol. 10, No. 3 (2021)
Authors:Assayed Hussain Tanveer Pages: 24 - 34 Abstract: Electrokinetics encompasses the analysis of fluid or particle motion in the electrical field; includes electroosmosis, electrophoresis, dielectrophoresis, electro-wetting, etc. Electrokinetic applications in the production of microfluidic systems have become quite attractive over the last decade. Electro-kinetic systems usually do not need any additional mechanical moving parts and may be made compact by removing the power source with a small battery. Electro-kinetic based microfluidic systems may also serve as a feasible method for developing a lab-on-a-chip (LOC) for use in biological and chemical assays. Here we discuss our work on electrokinetic based mixing and separation in microfluidic systems. First, we present a novel, fast, quasi-T-channel micromixer with electrically conductive sidewalls and some newly observed mixing process phenomena. The side walls of the microchannel may be parallel or non-parallel with an angle. In terms of velocity and scalar concentration distributions, the mixing activities in the micromixer with various angles between the two electrodes situated at the side walls are studied. It is observed that mixing can be quickly improved at a slight angle of about 5 ° between the two side walls of the electrode, also at low AC voltage, relative to parallel side walls. The efficacy of many parameters has been investigated for further development of the fluid mixing, including conductivity curve, AC electric flow frequency, applied voltage, AC signal phase change between the electrodes, etc. The findings demonstrate that the mixing is stronger under the high conductivity curve, low frequency , high voltage and 180o signal phase change between the two electrodes. Quick mixing under high AC frequency can also be accomplished in this quasi-T-channel micromixer. The most significant discovery is that turbulence can be accomplished for the first time under the low Reynolds number AC electrokinetic force in the order of 1 in this novel configuration. As a consequence, turbulent mixing may also be produced in microfluidics to induce rapid mixing. The turbulent flow is often measured with a laser-induced photo bleaching anemometer. PubDate: 2021-01-23 DOI: 10.37591/.v10i3.1063 Issue No:Vol. 10, No. 3 (2021)
Authors:Michael Shoikhedbrod Pages: 35 - 45 Abstract: Purification of liquid fuel and special liquids from solid harmful inclusions in aircrafts and spacecraft under conditions of reduced acceleration of gravity and weightlessness is a very important, and also a critical task for an aircraft or rocket engine and life support systems of astronaut crews. An equally important role is played by the concentration of Chlorella from its nutrient medium during space flight to add this concentrate to the diet of astronauts for their normal functioning on board the ISS (International Space Station) for a long time. The paper presents the developed methods and devices permitting to clean harmful solid particles from the fuel liquid in the fuel tank of an aircraft or rocket engine using the effect on liquid fuel of the acceleration of gravity decrease or the effect on special liquids of the spacecraft’s life support system of DC(Direct Current) in the space flight simple, economically highly effectively, productively and mobile (i.e., can be used in any parts of aircraft power supply system and life support systems of spacecraft). The developed method and device of concentration of Chlorella from its nutrient medium during space flight permit to produce highly quality concentrate Chlorella simple, productive to add to the diet of astronauts for their normal functioning on board of the ISS (International Space Station) for a long time. PubDate: 2021-02-25 DOI: 10.37591/.v10i3.1031 Issue No:Vol. 10, No. 3 (2021)
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