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

Julie-Anne Zambaux (1, 2) , Jean-Luc Harion (1) , Serge Russeil (1) , Pascale Bouvier (1, 2)

1 IMT Lille Douai - Ecole nationale supérieure Mines-Télécom Lille Douai
2 HEI - Hautes Etudes d’Ingénieur [Lille]

Successive alternating wall deformations are applied to the external and internal walls of a coaxial tube. Through a numerical study, the flow structuration created by the combination of the wall deformations is investigated. The effect of the longitudinal phase-shifting between the external and internal deformations is more specifically studied by considering velocity vectors and normalised helicity fields. All the simulations are performed under the assumption of a laminar, incompressible and stationary flow. The convective heat transfer is also calculated and the performance evaluation criterion PEC ¼ ðNu=Nu0Þ=ðf =f0Þ1=3 is used to assess the thermalehydraulic performances. For a fixed temperature condition on both walls, it is shown that the heat transfer performances are increased compared with a smooth annular geometry. The phase-shifting value giving the best thermalehydraulic performances is also identified: a phase-shifting of one eight of a wavelength between the external and internal walls helps increasing the performances of 43%.

Mots clés: Heat transfer enhancement; Annular configurations; Wall deformation; Numerical simulations; Phase-shifting

Domaines: Milieux fluides et réactifs; Génie des procédés

Julie-Anne Zambaux, Jean-Luc Harion, Serge Russeil, Pascale Bouvier. The effect of successive alternating wall deformation on the performance of an annular heat exchanger. Applied Thermal Engineering, 2015, 90, pp.286-295. ⟨10.1016/j.applthermaleng.2015.06.091⟩. ⟨hal-02538995⟩