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ISSN 打印: 1064-2285
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传热学

DOI: 10.1615/HeatTransRes.v32.i7-8.110
10 pages

Heat Transfer and Hydraulic Resistance in Rod Bundles of Tubes with Counter Wire-Winding in Longitudinal Flow

Benediktas B. Cesna
Lithuanian Energy Institute, Kaunas, Lithuania

ABSTRACT

The paper presents the results of experimental investigation of hydraulic resistance, mixing, and heat transfer of rod bundles consisting of 85 counter wire-wound rods in an axial air flow. The rods were spaced by means of two- and four-wire counter coils. The pitch-to-diameter ratio P/d = 1.23 was used. For the bundle with opposite wire-winding 43 rods were with 4-wire coils and 42 rods were with 2-wire coils. The left direction of wire winding was used for 4-wire coils and the right direction for 2-wire coils. The helical-lead-to-rod-diameter ratio was T/d = 20 for rods with 4-wire coils and T/d = 10 for rods with 2-wire coils. Experiments were performed in an air flow within the range 4.3·103 < Re ≤ 7·104.


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