Heat-Transfer Augmentation in Rod Bundles Near Grid Spacers

[+] Author and Article Information
S. C. Yao

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pa.

L. E. Hochreiter, W. J. Leech

Westinghouse Electric Company, Pittsburgh, Pa.

J. Heat Transfer 104(1), 76-81 (Feb 01, 1982) (6 pages) doi:10.1115/1.3245071 History: Received February 27, 1981; Online October 20, 2009


Heat-transfer augmentation by straight grid spacers in rod bundles is studied for single-phase flow and for post-critical heat flux dispersed flow. The heat transfer effect of swirling grid spacers in single-phase flow is also examined. Governing heat-transfer mechanisms are analyzed, and predictive formulations are established. For single-phase flow, the local heat transfer at a straight spacer and at its upstream or downstream locations are treated separately. The effect of local velocity increasing near swirling spacer is considered. For post critical heat flux (CHF) dispersed flow, the heat transfer by thermal radiation, fin cooling, and vapor convection near the spacer are calculated. The predictions are compared with experimental data with satisfactory agreement.

Copyright © 1982 by ASME
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