The effect of successive alternating wall deformation on the performance of an annular heat exchanger

Zambaux, J.-A.; Harion, J.‐L.; Russeil, S.; Bouvier, Pascale

doi:10.1016/j.applthermaleng.2015.06.091

Cited by 17 publications

(1 citation statement)

References 33 publications

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“…The results showed that the highest Nu is 1.75 times larger than that for the simple tube at identical Re. Zambaux et al [26] numerically investigated the heat transfer performance of the annular tube, of which both the inner and outer tube walls are formed by successive alternating wall deformations. They found that the value of JF can be up to 1.43 for all the investigated cases when the longitudinal phase-shifting of the tube is equal to 1/8.…”

Section: Of 15mentioning

confidence: 99%

Heat Transfer Enhancement in a Novel Annular Tube with Outer Straight and Inner Twisted Oval Tubes

Luo,

Song,

Tagawa

et al. 2020

Symmetry

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The thermal-hydraulic performance in a novel annular tube formed by outer straight and inner twisted oval tubes is numerically investigated. An annular tube formed by two straight oval tubes is also studied for comparison. Inner twisted oval tubes with different aspect ratios and twist ratios are studied. The heat transfer is well improved by the symmetrical secondary flow in the annulus. The Nusselt number generally increases when the inner oval tube becomes flatter and the twists stronger in the studied range of geometrical parameters. The largest Nusselt number Nu of the inner twisted tube increases by 116% while the friction factor f increases by only 46% compared with that of the inner straight tube, and the largest value of the thermal performance factor (JF) can be up to 1.9. Correlations of the Nusselt number and friction factor are proposed for laminar and turbulent flows, and the deviations of the correlations are within ±5% and ±4% for Nu and f, respectively.

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Section: Of 15mentioning

confidence: 99%