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Tikrit Journal of Engineering Sciences (2007) 14(3) 1-24

Numerical Study for Buoyancy Effect On Developing in The Entrance Region Horizontal of Eccentric Annulus

Mohammed H. Al-Mosawi Gazinga F. Al-Barzinji Ghassan F. Lattif
Mechanical Eng. Dept., University of Karbala’a, Iraq Mechanical Eng. Dept., Kirkuk University, Iraq Mechanical Eng. Dept., Tikrit University, Iraq

Abstract

In this research, a numerical study has been done to done to clarify the effect of the eccentric annulus of to two horizontal cylinders on the rate flow the behavior of the thermal boundary layer at the entrance. The research includes the study of the effect of the eccentric annulus percentage and its directions on the flow behavior when the internal cylinder. The theoretical analysis of the question includes the solving of Naver – Stoke and energy equations on the supposition that the flow is steady, fully developing hydrodynamic, and in the stage of thermal developing. The question has been numerically solved after the transformation of the Cartesian coordinates to the computational domain by applying body fitted coordinates. The results include a survey of the cylinder surface in many sites of annulus flow, where as it is appeared in that the bouncy force causes the secondary flow behaves none uniformly at the entrance. The Nusselt number average along the two cylinders is decreased with the increase of eccentricity as a result of narrowing in the flow area which diminishes the average of heat transfer quality. We also conclude that the increase of Rayleih number with the movement of the heated cylinder towards low causes the increase of the average of Rayleih number and the laminar flow changes to turbulent flow at the limited region of the entrance when Rayleih number increases or the eccentricity percentage with cylinder movement away from the perpendicular halfway axis but the disturbance vanishes in approaching to the fully developed heated region. A correlation relationship is extracted to find an average change of Nusselt number after the stability of flow in the fully developed region when the diameter of the internal cylinder equals to half of external.

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KeywordsAnnulus, Eccentric, Buoyancy Force, Horizontal.

How to cite

TJES: Al-Mosawi MH, Al-Barzinji GF, V GF. Numerical Study for Buoyancy Effect On Developing in The Entrance Region Horizontal of Eccentric AnnulusTikrit Journal of Engineering Sciences 2007; 14(3): 1-24.
APA: Al-Mosawi, M. H., Al-Barzinji, G. F., & Lattif, G. F. (2007). Numerical Study for Buoyancy Effect On Developing in The Entrance Region Horizontal of Eccentric Annulus. Tikrit Journal of Engineering Sciences, 14(3), 1-24.