Mehmet Cem Ece

Liquid diffusion model for intermittent drying of rough rice

Intermittent 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 rough rice grains was found to increase with longer tempering periods.

The initial boundary-layer flow past a translating and spinning rotational symmetric body

The boundary-layer flow on an impulsively started translating and spinning rotational symmetric body is considered. The stream function and the swirl component of the velocity are expanded in series in powers of time. Leading and first order solutions are obtained analytically and the second order solutions are determined numerically. The results are applied to a translating and spinning sphere and the rotation is found to reduce the friction drag and facilitate flow separation.

Similarity solutions for free convection to power-law fluids from a heated vertical plate

Steady, laminar free-convection boundary-layer flow of a power-law fluid over a vertical heated plate under mixed thermal boundary conditions is investigated. A transformation relating the similarity solutions of the boundary-layer velocity and temperature profiles is obtained.

Free convection flow about a vertical spinning cone under a magnetic field

A similarity analysis was performed to investigate the laminar free-convection boundary-layer flow in the presence of a transverse magnetic field over a heated down-pointing cone spinning with a constant angular velocity about the symmetry axis. Boundary-layer velocity and temperature profiles were determined numerically for prescribed surface temperature or heat flux and for various values of the magnetic and spin parameters and the Prandtl number. The spin of the body augments the velocity profiles increasing the skin friction and compresses the temperature profiles toward the surface increasing the surface heat flux for the prescribed surface temperature case and decreasing surface temperature for the prescribed heat flux case. The magnetic field suppresses the velocity profiles and decreases the skin friction. The temperature profiles were expanded with increasing values of the magnetic parameter resulting in lower surface heat flux for the prescribed surface temperature case and higher surface temperature for the prescribed heat flux case.

Thermal Convection in a Closed Vertical Rotating Circular Cylinder Heated From the Top

Steady laminar thermal convection and induced flow in a rotating circular cylinder heated from top with bottom and side walls kept at a uniform temperature were considered and the governing equations were solved numerically. Flow field consists of a single eddy with clockwise rotation for all cases considered. Center of the eddy shifts from a location near the side wall to a location near the top disc as the aspect ratio increases.Copyright

Flow and Heat Transfer in a Closed Rotating Circular Cylinder Heated From Top

Steady laminar centrifugally driven convective heat transfer in a spinning circular cylinder with top wall at higher and bottom and side walls at lower uniform temperatures were considered and the governing equations were solved numerically. Flow field is consist of a single eddy with clockwise rotation for all cases considered. Center of the eddy shifts from a location near the side wall to a location near the top disc as the aspect ratio increases.Copyright