每年出版 18 期
ISSN 打印: 1064-2285
ISSN 在线: 2162-6561
Indexed in
Heat Transfer and Hydraulic Resistance in Rod Bundles of Tubes with Counter Wire-Winding in Longitudinal Flow
摘要
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.