PASSIVE HEAT TRANSFER AUGMENTATION IN A CYLINDRICAL ANNULUS UTILIZING MULTIPLE PERTURBATIONS ON THE INNER AND OUTER CYLINDERS

Autor:	S. V. Iyer, Kambiz Vafai
Rok vydání:	1999
Předmět:	Numerical Analysis Geometry Heat transfer coefficient Condensed Matter Physics Nusselt number Finite element method Cylinder (engine) law.invention Physics::Fluid Dynamics law Heat transfer Fluid dynamics Annulus (firestop) Galerkin method Mathematics
Zdroj:	Numerical Heat Transfer, Part A: Applications. 35:567-586
ISSN:	1521-0634 1040-7782
DOI:	10.1080/104077899275047
Popis:	The effects of multiple geometric perturbations on the inner and outer cylinders of an annulus with impermeable end walls are in vestigated in this work. A three-dimensional study was done using a numerical scheme based on a Galerkin method of finite element formulation. The nature of the buoyancy-induced flow field has been analyzed in detail. The flow fields for the cases considered were found to be qualitatively similar, and the introduction of each additional perturbation altered the flow field in a regular and recurring manner. The introduction of each perturbation on the outer cylinder causes clockwise and counterclockwise rotating patterns on either side of the perturbation in the upper circumferential regions of the annulus. The motion of the fluid entrained by these circulatory patterns constitutes the key features of the flow pattern observed in the annulus. It is observed that the presence of multiple perturbations on the inner and outer cylinders substantially increases the overall heat transf...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c6cff4f58f04194ea13339d85c499bfa https://doi.org/10.1080/104077899275047 Zobrazit plný text záznamu Plný text ve formátu PDF