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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TURBULENT MIXED CONVECTIVE HEAT TRANSFER IN THE ENTRANCE REGION OF A HELICAL PIPE WITH UNIFORM WALL TEMPERATURE

L.J. Li
HEMISPHERIC CENTER FOR ENVIRONMENTAL TECHNOLOGY FLORIDA INTERNATIONAL UNIVERSITY 10555 W. FLAGLER STREET MIAMI, FLORIDA 33174

Cheng-Xian Lin
Department of Mechanical and Materials Engineering Florida International University, Miami, Florida 33174, USA

M. A. Ebadian
Mechanical Engineering Department, Florida International University The State University of Florida at Miami, Miami, FL 33199, USA

DOI: 10.1615/IHTC11.3230
pages 311-316

Sinopsis

A fully elliptic numerical study was performed to investigate the buoyancy-affected, three-dimensional turbulent flow and heat transfer in the entrance region of a helical pipe. The Renormalization Group (RNG) k - ε model was used to simulate the turbulent flow and heat transfer in the pipe.
The computed results on forced convective flow and heat transfer showed agreement with previous experimental data, It was found that the distribution of axial velocity and temperature rotated clockwise in different extents, depending on the ratio of √Gr/Dn√(l + Pr). At higher Grashof numbers, the developing secondary flow field showed the existence of three vortices. The augmentation of the average Nusselt number and friction factor resulting from buoyancy was prominent at the entrance region of the pipe, but gradually became weaker further downstream.

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