Convective Heat Exchange of Single-Row Bundles from Tubes with Rolled Aluminum Fins of Various Height at a Low Values of the Reynolds Number

The experimental study of the heat flow intensity a single-row horizontal air-cooled tubular bundle exchanger with spiral aluminum rolling fins at low Reynolds numbers (Re < 2000) is performed. geometrical dimensions bimetallic finned tubes bundle, following: outer diameter d = 56.0 mm; tube base 0 26.8 fin height h 14.6 pitch s 2.5 average thickness Δ 0.5 coefficient φ 19.3; transfer length l 300 mm. load-bearing steel н 25 wall 2 research was carried out by method full thermal modeling specially designed stand electric heating and an exhaust shaft installed above bundle. air rate through regulated changing cross-sectional area shaft. Calibration experiments were confirmed reliability data obtained. Then sanded so to form new types tubes, which arranged in six-tube constant relative cross-step σ 1 S / 1.14 const, studies repeated. As result, generalized criterion equation for small various heights finning 0-14.6 mm effective ( 8 mm) determined dimensional metal-intensive criteria.