Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, cilt.37, sa.4, ss.625-633, 1994 (SCI-Expanded)
This study presents an investigation of transient heat transfer from cylindrical products to both the water and air flows and obtains the methods for determining the cooling process parameters (cooling coefficient, lag factor, half cooling time and seven-eighths cooling time) and heat transfer parameters (thermal conductivity, thermal diffusivity, specific heat, and heat transfer coefficient). The various batches of the cylindrical products were cooled in the water flow at constant flow velocity and the same batches of the cylindrical products were also cooled in air at different flow velocities. During cooling experiments, the center temperatures of the individual products were measured and the temperature data were used to determine the cooling process and heat transfer parameters. The results of the present study showed that the half cooling times and seven-eighths cooling times increased at constant flow velocity with increasing batch weight in water cooling and decreased with increasing the flow velocity in air cooling and that the heat transfer coefficients decreased by 47.7% at constant batch weight (5 kg) with an increase in the batch weight in water cooling and increased by 46.2% with an increase in the flow velocity in air cooling.