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Öğe Investigation of the effect of drying air temperature on drying time by numerical method for textile bobbins(Institute of Physics Publishing, 2019) Akyol U.; Karakoca A.; Shaliyev R.; Akal D.; Uzuneanu K.Drying of the yarn bobbins in the textile sector is a very important stage among the textile finishing processes. Because this process takes a lot of time and causes a large amount of energy consumption. In this study, drying times for different drying air inlet temperatures at a constant drying air pressure were determined with the help of mathematical model for textile bobbin drying process. Finite difference method was used in mathematical model solution and the effect of different space and time steps were taken into consideration during the solution. © Published under licence by IOP Publishing Ltd.Öğe A review of new technologies in valve systems of internal combustion engines and their effects(Institute of Physics Publishing, 2019) Akal D.; Akyol U.; Uzuneanu K.Efficient use of energy is becoming increasingly crucial due to global warming and depleting fossil fuel sources. Automotive manufacturers aim for fuel economy, reduction of exhaust emissions, durability, volume and weight reduction, and power and torque increase in internal combustion engines. One of the most important developments in this field is the new technologies in classic valve systems. There are still ongoing studies in this field as the gas exchange processes affects all engine parameters. In this review; the principles of new technologies used on classic valve systems and their effects on engines have been investigated. The research has shown; new mechanism technologies used on valve systems have positive effects on engine performance, power, torque and fuel consumption. © Published under licence by IOP Publishing Ltd.
