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RESEARCH PAPERS

Experimental and Analytical Study of Axial Turbulent Flows in an Interior Subchannel of a Bare Rod Bundle

[+] Author and Article Information
P. Carajilescov

Institute Tecnológico de Aeronáutica, São Jose dos Campos, Brazil

N. E. Todreas

Massachusetts Institute of Technology, Cambridge, Mass.

J. Heat Transfer 98(2), 262-268 (May 01, 1976) (7 pages) doi:10.1115/1.3450529 History: Received January 22, 1976; Online August 11, 2010

Abstract

Reactor fuel elements generally consist of rod bundles with the coolant flowing axially through the bundles in the space between the rods. Heat transfer calculations form an important part in the design of such elements, which can only be carried out if information of the velocity field is available. A one-equation statistical model of turbulence is applied to compute the detailed description of velocity field (axial and secondary flows) and the wall shear stress distribution of steady, fully developed turbulent flows with incompressible, temperature-independent fluid, flowing through triangular arrays of rods with different aspect ratios (P/D ). Also experimental measurements of the distributions of the axial velocity, turbulence kinetic energy, and Reynolds stresses were performed using a laser Doppler anemometer (LDA), operating in a “fringe” mode with forward scattering, in a simulated interior subchannel of a triangular rod array with P/D = 1.123 and L/D H = 77. From the experimental results, a new mixing length distribution is proposed. Comparisons between the analytical results and the results of this experiment as well as other experimental data available in the literature are presented. The results are in good agreement.

Copyright © 1976 by ASME
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