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Öğe Flow and heat transfer in a closed rotating circular cylinder heated from top(American Society of Mechanical Engineers, 2003) Kahveci K.; Ece M.C.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.Öğe Natural convection to power-law fluids from a heated vertical plate under mixed thermal boundary conditions(ASME, Fairfield, NJ, United States, 1999) Büyük E.; Ece M.C.Steady free convection laminar boundary-layer flow subject to mixed thermal boundary conditions along a heated vertical plate immersed in a quiescent power-law fluid is investigated. Similarity solutions are obtained numerically for the boundary-layer velocity and temperature profiles. The effects of flow behavior index and the generalized Prandtl number on the surface shear stress and heat flux are determined.Öğe NATURAL CONVECTION TO POWER-LAW FLUIDS FROM A HEATED VERTICAL PLATE UNDER MIXED THERMAL BOUNDARY CONDITIONS(American Society of Mechanical Engineers (ASME), 1999) Büyük E.; Ece M.C.Steady free convection laminar boundary-layer flow subject to mixed thermal boundary conditions along a heated vertical plate immersed in a quiescent power-law fluid is investigated. Similarity solutions are obtained numerically for the boundarylayer velocity and temperature profiles. The effects of flow behavior index and the generalized Prandtl number on the surface shear stress and heat flux are determined. © 1999 American Society of Mechanical Engineers (ASME). All rights reserved.Öğe Thermal convection in a closed vertical rotating circular cylinder heated from the top(American Society of Mechanical Engineers (ASME), 2003) Kahveci K.; Ece M.C.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.Öğe Unsteady laminar thermal boundary layer on a spinning permeable isothermal body(1997) Kahveci K.; Ece M.C.The initial laminar thermal boundary-layer flow past an impulsively started translating and spinning rotational symmetric, permeable isothermal body is investigated. Velocity components and temperature are expanded in series in powers of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that the unsteady flow field displays complex patterns. Surface blowing is observed to aid body spin in facilitating flow separation. Surface heat flux is enhanced near the front stagnation point and in the reversed flow region and reduced around the point of separation. Surface suction is found to increase the heat transfer while surface blowing decreases it.Öğe UNSTEADY LAMINAR THERMAL BOUNDARY LAYER ON A SPINNING PERMEABLE ISOTHERMAL BODY(American Society of Mechanical Engineers (ASME), 1997) Kahveci K.; Ece M.C.The initial laminar thermal boundary-layer flow past an impulsively started translating and spinning rotational symmetric, permeable isothermal body is investigated. Velocity components and temperature are expanded in series in powers of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that the unsteady flow field displays complex patterns. Surface blowing is observed to aid body spin in facilitating flow separation. Surface heat flux is enhanced near the front stagnation point and in the reversed flow region and reduced around the point of separation. Surface suction is found to increase the heat transfer while surface blowing decreases it. © 1997 American Society of Mechanical Engineers (ASME). All rights reserved.Öğe Unsteady mixed convection over spinning isothermal bodies with blowing and suction(2000) Öztürk A.; Ece M.C.Initial development of the laminar thermal boundary-layer flow over an impulsively started translating and spinning axisymmetrical isothermal body with blowing and suction in the case of mixed convection is investigated. Velocity components and temperature are expanded in series in powers of the square root of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that buoyancy driven aiding and opposing flows help surface suction in retarding and surface blowing in facilitating the onset of flow separation respectively. Surface heat flux is increased near the front stagnation point due to the axial inflow created by the body spin and enhanced by the circulating flow inside the separated region. Surface suction is found to increase the heat transfer while the surface blowing decreases it. Aiding and opposing flows increase the surface heat flux around the front and rear stagnation points respectively.Öğe Unsteady mixed convection over spinning isothermal bodies with blowing and suction [Conference Paper(American Society of Mechanical Engineers (ASME), 2000) Ozturk A.; Ece M.C.Initial development of the laminar thermal boundary-layer flow over an impulsively started translating and spinning axisymmetrical isothermal body with blowing and suction in the case of mixed convection is investigated. Velocity components and temperature are expanded in series in powers of the square root of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that buoyancy driven aiding and opposing flows help surface suction in retarding and surface blowing in facilitating the onset of flow separation respectively. Surface heat flux is increased near the front stagnation point due to the axial inflow created by the body spin and enhanced by the circulating flow inside the separated region. Surface suction is found to increase the heat transfer while the surface blowing decreases it. Aiding and opposing flows increase the surface heat flux around the front and rear stagnation points respectively. © 2000 by ASME.Öğe Vibration and buckling of in-plane loaded double-walled carbon nano-tubes(2007) Aydo?du M.; Ece M.C.The paper studies vibration and buckling of in-plane loaded double-walled carbon nanotubes. Timoshenko beam theory was used to investigate the vibration and buckling behavior of double-walled and simply supported carbon nanotubes. The influence of in-plane loads on the natural frequencies was determined. The results show that while the natural frequencies decrease with increasing compressive in-plane loads an increase in frequencies is observed for tension type of in-plane loads. The effects of in-plane loads are more pronounced for lower modes and some mode changes are observed at critical in-plane loads. © Tübitak.
