Impact of an oscillating guide vane on the thermo-hydraulic fields in a square cavity with single inlet and outlet ports. (January 2019)

• Record Type: Journal Article
• Authors: Shih, Yang-Cheng; Khodadadi, J.M.; Nien, Shih-Wei; Zeng, Yi; Huang, Xuan-Long
• Is Part Of: International journal of heat and mass transfer. Volume 128(2019)
• Page Start: 1184
• Page End: 1200
• Publication Date: 2019-01
• Subjects: Computational fluid dynamics -- Enclosures -- Enhanced heat transfer -- Flow oscillation -- Flow separation -- Forced convection -- Guide vane -- Rotating vortices; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.09.060
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Dynamic transverse throughflow with vortices on its sides was seen for small amplitude of oscillations of guide vane. Variations of the temperature being weak or strong correlate to low and high amplitude of oscillations, respectively. Heat transfer performance is augmented with the increase of the amplitude of oscillations for a constant Strouhal number. For constant amplitude of oscillations, thermal performance is diminished with rise of the Strouhal number. Improved heat transfer is accompanied with greater pressure drop. Abstract: This study reports on a numerical investigation of the impact of an oscillating rigid plate guide vane on the transient behavior of thermo-hydraulic fields within a square cavity with single inlet and outlet ports. The computational fluid dynamics software ANSYS® FLUENT was employed to perform the numerical simulations. The numerical analysis focused on the effect of the frequency and amplitude of an oscillating rigid guide vane on modification of the transverse throughflow, internal flow re-distribution, re-arrangement of multiple rotating vortices and the ensuing heat transfer performance. According to the numerical results, it is shown that for a combination of the Strouhal number and amplitude of inclination angle of the guide vane, the instantaneous Nusselt number that is a measure of the thermal performance of the system exhibits cyclical changes once the respective periodic state was reached. Moreover, the cycle-averaged and peak-to-peak Nusselt number increases with the increase of the amplitude of oscillations as the frequency of oscillation is fixed. For a fixed amplitude of oscillation, the cycle-averaged and peak-to-peak Nusselt number decreases as the frequency increases. Instantaneous variations of the dimensionless pressure drop of the cavity also exhibited periodic oscillations. Enhancement of heat transfer due to oscillations of the guide vane was accompanied with the expense of increasing the pressure drop.