Steady Mixed Convection in a Rotating Cylinder with Heated Bottom Surface (original) (raw)
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Flow and Heat Transfer in a Closed Rotating Circular Cylinder Heated From Top
Heat Transfer: Volume 1, 2003
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.
Flow and Heat Transfer in a Closed 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.
Centrifugally Driven Flow and Heat Transfer in a Rotating Cylinder Uniformly Heated from Bottom
Steady, laminar, eentrifugally driven eonveetive heat transfer in a spinning cireular eylinder was eonsidered. The governing equations were solved numerieally. Aspeet ratjo, Reynolds and Rayleigh numbers have a signifieant effeei on the veloeity and temperature fields. DISTRIBUTION CENTRIFUGE DE L'ECOULEMENT ET TRANSFERT DE CHALEUR DANS UN CYLlNDRE EN ROTATION CHAUFFE UNIFORMEMENT PAR LE FOND RESUME Stable, laminar, le transfert de ehaleur de eonveetive eentrifugation eonduit dans un eylindre eireulaire de rotation a ete examine. Les equations gouvernantes ant ete resolues numeriquement. La proportion d'aspect les nombres de Reynolds et Rayleigh ant un effet signifieatif sur de vitesse et les champs de temperature.
Thermal Convection in a Closed Vertical Rotating Circular Cylinder Heated From the Top
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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.
Convective Heat Transfer Across Rotating Cylinder at Unsteady Laminar Flow Regime
International journal of engineering research and technology, 2018
This paper is devoted to convective heat transfer across the rotating cylinder at unsteady state laminar flow regime.Governing equation Navier-Stroke equation used via the finite volume method for implicit pressure based model. The convective heat transfer calculated at Reynolds number (Re) = 100 and 200 with the range of spin rate (q) = 0 to 2.5 and constant Prandtl number (Pr = 0.7). The results visualize for various spin rate and Re, which show the effect of Nusselt number and local Nusselt number variation around the cylinder surface. KeywordsHeat transfer, Rotating cylinder, Nusselt number, Laminar flow.
Laminar forced convection from a rotating horizontal cylinder in cross flow
Journal of Thermal Science, 2017
The influence of non-dimensional rotational velocity, flow Reynolds number and Prandtl number of the fluid on laminar forced convection from a rotating horizontal cylinder subject to constant heat flux boundary condition is numerically investigated. The numerical simulations have been conducted using commercial Computational Fluid Dynamics package CFX available in ANSYS Workbench 14. Results are presented for the non-dimensional rotational velocity α ranging from 0 to 4, flow Reynolds number from 25 to 40 and Prandtl number of the fluid from 0.7 to 5.4. The rotational effects results in reduction in heat transfer compared to heat transfer from stationary heated cylinder due to thickening of boundary layer as consequence of the rotation of the cylinder. Heat transfer rate increases with increase in Prandtl number of the fluid.
Mixed convection of a heated rotating cylinder in a square enclosure
International Journal of Heat and Mass Transfer, 2014
Numerical investigations were carried out for natural and mixed convection within domains with stationary and rotating cylinder by using an immersed-boundary method. The method was first validated with flows induced by natural convection in the annulus between concentric circular cylinder and square enclosure. Steady mixed convection in a square enclosure with an active rotating cylinder was further investigated for different rotating speeds. The parameters investigated in the study included Rayleigh number, Prandtl number and the aspect ratio between inner cylinder and outer enclosure. The heat transfer quantities of the system were obtained for different Rayleigh numbers (Ra) within the range of 10 4-10 6. The influence of rotation on the instability of the flow at different Prandtl numbers within the range of 0.07-7.0 was also investigated. Local and average heat transfer characteristics were fully studied around the surfaces of both inner cylinder and outer enclosure.
International Journal of Heat and Mass Transfer, 2009
Forced convection heat transfer across a circular cylinder rotating with a constant non-dimensional rotation rate ðaÞ varying from 0 to 6 are investigated for Reynolds numbers of 20-160 and a Prandtl number of 0.7. Flow transitions is reported here for a wider range of Reynolds number and rotation rates. Heat transfer visualization technique using heatlines is implemented here, probably for the first time, in finite volume framework for the unsteady heat transfer problem in complex domain and used for heat flow analysis. Rotation can be used as a drag reduction and heat transfer suppression technique.
Convective heat transfer inside a rotating cylinder with an axial air flow
International Journal of Thermal Sciences, 2006
This article presents an experimental identification technique for the convective heat transfer coefficient inside a rotating cylinder with an axial airflow. The method consists in heating the outer face of the cylinder using infrared lamps, and acquiring the evolution of the external surface temperature versus time using an infrared camera. Heat transfer coefficients are identified via three methods. The first one is based on an inverse model, the second one assumes the wall of the cylinder as a thermally thin wall and the third one is based on an analytical method permitting to obtain the temperature field within the whole cylinder. The experiments were carried out for a rotational speed ranging from 4 to 880 rpm corresponding to rotational Reynolds numbers varying from 1.6 × 10 3 to 4.7 × 10 5 and an air flow rate varying from 0 to 530 m 3 h −1 which corresponds to an axial Reynolds numbers ranging from 0 to 3 × 10 4 . Correlations connecting the Nusselt number to the axial and rotational Reynolds numbers are also proposed.