Yazar "Shaliyev, Rafayel" seçeneğine göre listele

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    A mathematical model for through-air drying process of yarn bobbins
    (Taylor and Francis Ltd., 2021) Akyol, Uğur; Karakoca, Alper; Shaliyev, Rafayel; Kahveci, Kamil; Cihan, Ahmet
    In this study, a mathematical model has been developed to simulate the through-air drying process of yarn bobbins. For this purpose, experimental data was obtained in a prototype experimental set up by passing pressurized hot air through the wool yarn bobbins. First of all, the physical phenomenon expressing the drying process has been reduced to the heat transfer problem and then a mathematical model has been written for the drying process which also includes the convective term. Using the experimental data, the coefficient included in the mathematical model was found by the extremal method. So, an inverse problem was solved. The accuracy of the model was checked by comparing with the experimentally obtained temperature values after solving a direct heat transfer problem in the given conditions. Good correlation between the obtained model results and the experimental results shows the accuracy of the mathematical model. © 2021 The Textile Institute.
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    Effect of Some Factors on Solution Sensitivity in Determination of Temperature Field by Finite Difference Method for the Drying Process of Yarn Bobbins
    (Namık Kemal Üniversitesi, 2018) Akyol, Uğur; Karakoca, Alper; Shaliyev, Rafayel
    In this study, a mathematical model for the drying process of dyed wool yarn bobbins by passing hot air through them has been presented. The presented mathematical model reduced the drying problem to a nonlinear, nonstationary heat convection problem including the convective effect caused by forced convection, together with the effective thermophysical properties of the wool yarn bobbins. The finite difference method was used for solving the mathematical model.
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    Investigation of the effect of drying air temperature on drying time by numerical method for textile bobbins
    (Institute of Physics Publishing, 2019) Akyol, Uğur; Karakoca, Alper; Shaliyev, Rafayel; Akal, Dinç; Uzuneanu, Krisztina
    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.
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    Thermophysical parameter estimation of a wool bobbin during convective drying process
    (Taylor & Francis Ltd, 2010) Akyol, Uğur; Cihan, Ahmet; Shaliyev, Rafayel
    In this work, an inverse heat transfer problem was solved by using experimental temperature data to estimate the effective thermal properties as well as the effective heat transfer coefficients on the inner and outer surfaces of a moist wool bobbin during a hot-air drying process. Before the inverse problem solution, the mathematical model of the drying wool bobbin was expressed by means of a single energy conservation equation and convenient boundary conditions, and then, the heat and mass transfer problem in the model was reduced to a heat conduction problem. The inverse problem was solved by direct method with finite difference scheme. Model temperatures obtained from the solution of the direct problem were used for verification of the effective thermophysical properties. The results with good agreement between the model and the experimental temperatures confirm the accuracy of the effective thermophysical properties of the bobbin estimated by the inverse method.