In the last couple of years, the footprints of humankind on the greenhouse effect have been a highlighted and debated topic. There are many contributing factors to the negative impacts on the environment, one of them being the automobile sector. Today, most cars are driven on fossil fuel, which produces toxic emissions. The search for replaceable alternative fuels were considered mainly and the keys to demand are renewable energy and energy-friendly resources. Hydrogen as a fuel, in particular hydrogen gas, is one of the options considering the only residues to be water and hot air, provided that the energy used in the hydrogen production comes from renewable sources. In the storage tanks of cars fueled by hydrogen gas, a high pressure is set due to its advantages of more storage opportunities and thus increased mileage of the tank. A decompression process is necessary to supply the fuel cell with hydrogen gas at the right pressure and thus achieve the highest possible degree of efficiency. The concept offers a wide set of application opportunities in industrial situations, and understanding the valve is important for characterizing the performance of the device. In other words, high performance could be achieved with correct and optimal geometry on the Tesla valve. In this work, the geometric parameters were investigated in order to determine their ideal value for optimizing the performance. The parameters of interest were the optimum operating conditions of the valve. A numerical observation was conducted using simulations in a Computational Fluid Dynamics program, ANSYS Fluent, in order to obtain the results.
Heat exchangers are equipment used to transfer heat from a high temperature fluid to a low temperature fluid without direct contact. Usually, the heat exchangers used for industrial applications are large in size. The objective of this study is to reduce the size of the heat exchanger and increasing the effectiveness by using suitable materials. The present study is carried out on a concentric tube heat exchanger with rectangular fins arranged around the circumference of the tube. The initial simulation is carried out to find the best material among aluminum bronze and Al 6061. The study is further continued to find the best inlet conditions by varying the mass flow rate from 0.25 kg/s to 3 kg/s in 0.25 kg/s increments and inlet temperature from 80°C to 90°C in 5°C increments. Cold water flow conditions, such as mass flow rate of 1.5 kg/s and inlet temperature of 30°C, are constant throughout the study. The heat exchanger was modeled in SOLIDWORKS 2020. The flow simulation and thermal analysis were carried out in SOLIDWORKS Flow Simulation 2020. The simulation results and the actual prototype results showed a variation of 4.2%.
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