An experiment is performed to detect the onset of time-dependent flow regimes within a water-filled square-sectioned cavity containing a horizontal cylindrical heat source. Data are recorded on the cavity cross-section, where velocity fields and local temperature values are detected using a 2D PIV rig, and thermocouples, respectively. Numerical predictions of the experimental runs are carried out, where the system is modelled as a 2D feature. Results are provided for nine values of the leading parameter, the modified Rayleigh number Raq, ranging from 1.48x10^4 to 1.21 x10^5. The system is witnessed to undergo a transition from steady-state, laminar flow to unsteady oscillatory flow at Raq = 5.88x10^4. Experimental data and numerical predictions are compared and cross-validated. The evolution of the flow throughout the bifurcation is described by velocity and temperature profile plots, 2D field visualizations and Fourier analysis of experimental time series. The influence of the flow regime on the overall heat transfer rate of the system is finally discussed.

Buoyancy-induced transitional flows around an enclosed horizontal cylinder: an experiment / Fiscaletti, D.; Angeli, Diego; Tarozzi, L.; Barozzi, Giovanni Sebastiano. - In: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER. - ISSN 0017-9310. - STAMPA. - 58:1-2(2013), pp. 619-631. [10.1016/j.ijheatmasstransfer.2012.11.039]

Buoyancy-induced transitional flows around an enclosed horizontal cylinder: an experiment

ANGELI, Diego;BAROZZI, Giovanni Sebastiano
2013

Abstract

An experiment is performed to detect the onset of time-dependent flow regimes within a water-filled square-sectioned cavity containing a horizontal cylindrical heat source. Data are recorded on the cavity cross-section, where velocity fields and local temperature values are detected using a 2D PIV rig, and thermocouples, respectively. Numerical predictions of the experimental runs are carried out, where the system is modelled as a 2D feature. Results are provided for nine values of the leading parameter, the modified Rayleigh number Raq, ranging from 1.48x10^4 to 1.21 x10^5. The system is witnessed to undergo a transition from steady-state, laminar flow to unsteady oscillatory flow at Raq = 5.88x10^4. Experimental data and numerical predictions are compared and cross-validated. The evolution of the flow throughout the bifurcation is described by velocity and temperature profile plots, 2D field visualizations and Fourier analysis of experimental time series. The influence of the flow regime on the overall heat transfer rate of the system is finally discussed.
58
1-2
619
631
Buoyancy-induced transitional flows around an enclosed horizontal cylinder: an experiment / Fiscaletti, D.; Angeli, Diego; Tarozzi, L.; Barozzi, Giovanni Sebastiano. - In: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER. - ISSN 0017-9310. - STAMPA. - 58:1-2(2013), pp. 619-631. [10.1016/j.ijheatmasstransfer.2012.11.039]
Fiscaletti, D.; Angeli, Diego; Tarozzi, L.; Barozzi, Giovanni Sebastiano
File in questo prodotto:
File Dimensione Formato  
2013_IntJHeatMassTransfer_Fiscaletti etal.pdf

non disponibili

Descrizione: Articolo principale
Tipologia: Versione dell'editore (versione pubblicata)
Dimensione 3.01 MB
Formato Adobe PDF
3.01 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/861693
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 38
  • ???jsp.display-item.citation.isi??? 33
social impact