Pressure drop for parallel flow through a roughened rod cluster

Journal Article · Wed Aug 01 04:00:00 EDT 1973 · Nuclear Engineering and Design

DOI:https://doi.org/10.1016/0029-5493(73)90032-0· OSTI ID:4413416

Maubach, K.; Rehme, K.

A method is described of calculating the pressure drop for parallel flow through rod clusters with artificial surface roughnesses in order to improve the heat removal. The method allows the extensive experimental data on artificial roughness to be applied to rod clusters. The method is based on universal fiow parameters for roughness and on general laws describing the pressure drop in non- circular channels with rough walls. The method is tested on the basis of measured results obtained from a rod cluster with 19 rough rods. The parameters determined are in excellent agreement with data measured in rough tubes and annular gaps. In this way it is possible, given the geometrical shape of the roughness elements, to calculate pressure drops and flow distributions in artificially roughened rod clusters contained in a smooth channel. The simplistic approach using an average friction factor and an overall hydraulic diameter results in rather unrealistic flow distributions and hence temperature distributions across the cluster. 18 references. (auth)

• Research Organization: Kernforschungszentrum, Karlsruhe, Ger.
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-001999
• OSTI ID: 4413416
• Journal Information: Nuclear Engineering and Design, Journal Name: Nuclear Engineering and Design Journal Issue: 3 Vol. 25; ISSN 0029-5493
• Publisher: Elsevier
• Country of Publication: Country unknown/Code not available
• Language: English

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FUEL RODS
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N42300 --Engineering--Heat Transfer & Fluid Flow
N77300* --Reactors--Power Reactors
Non-breeding
Graphite Moderated
ROUGHNESS