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Öğe Bulk drying kinetics of multi-layer rough rice(Amer Soc Agricultural Engineers, 1995) Cihan, A; Ece, MC; Kahveci, K[Abstract Not Available]Öğe Energy-exergy analysis and modernization suggestions for a combined-cycle power plant(Wiley, 2006) Cihan, A; Hacihafizoglu, O; Kahveci, KEnergy and exergy analysis were carried out for a combined-cycle power plant by using the data taken from its units in operation to analyse a complex energy system more thoroughly and to identify the potential for improving efficiency of the system. In this context, energy and exergy fluxes at the inlet and the exit of the devices in one of the power plant main units as well as the energy and exergy losses Were determined. The results show that combustion chambers, gas turbines and heat recovery steam generators (HRSG) are the main sources of irreversibilities representing more than 85% of the overall exergy losses. Some constructive and thermal suggestions for these devices have been made to improve the efficiency of the system. Copyright (c) 2005 John Wiley & Sons, Ltd.Öğe Heat transfer in continuous-drive friction welding of different diameters(Taylor & Francis Inc, 2005) Kahveci, K; Can, Y; Cihan, AHeat transfer in friction welding of similar and dissimilar cylindrical rods with different diameters is considered in the present study. The governing equations are solved numerically using an explicit finite-difference technique to determine the temperature field for various values of geometric and thermal parameters. The values of the parameters in the problem are selected as a = 1, 2, 4 for the aspect ratio, r(k) = 0.25, 1, 4 for the thermal conductivities ratio, and B-1 = 0.05, 0.01, 0.001 for the Biot number. The predicted temperature field is of similar form for all values of the parameters, but the radial and axial temperature gradients change at certain amounts for different values of parameters.Öğe Liquid diffusion model for drying a stack of rough rice(John Wiley & Sons Ltd, 2003) Kahveci, K; Cihan, A; Ece, MCDrying of a stack of rough rice was experimentally and theoretically investigated. Stacks of rough rice having different heights were dried with forced convection of warm air. A theoretical model was developed for predicting the bulk drying kinetics of a stack of rough rice using the analytical solution of liquid diffusion equation based on Fick's law. Effective diffusion coefficients were obtained minimizing the sum of squared differences between the theoretical results and experimental data obtained for various drying conditions. Drying air temperature is the most effective factor on the total rate of moisture removal from the stack. The bulk drying rate of a stack of rough rice was considerably reduced as compared to that of a single layer as the height of the stack increased. Agreement between the theoretical and experimental result is very good. Copyright (C) 2003 John Wiley Sons, Ltd.Öğe Liquid diffusion model for intermittent drying of rough rice(Elsevier Sci Ltd, 2001) Cihan, A; Ece, MCIntermittent drying of rough rice grains forming a thin layer was experimentally investigated. An analytical solution of the liquid diffusion equation based on a finite circular cylinder geometry for the rice grain was fitted to the experimental data. The effect of the tempering on the drying rate of rough rice grains was reflected as an increase in the effective diffusion coefficient. The drying rate of the cough rice grains was found to increase with longer tempering periods. (C) 2001 Elsevier Science Ltd. All rights reserved.Öğe A proposal for drying process of rough rice(Amer Soc Agricultural Engineers, 1995) Cihan, A; Ulger, P[Abstract Not Available]
