An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder

• Autorzy: Khudhair Baydaa K. , Saleh Adel M. , Ekaid Ali L.

Identyfikatory

DOI

10.29354/diag/165931

• Języki publikacji: EN

Abstrakty

EN

An experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus produced between two concentric and vertically eccentric circular cylinders is positioned horizontally, and its internal wall is uniformly heated while isothermally cooling the external wall. The range of present conditions for Rayleigh number is 5×10^4 ≤ Ra≤ 6.48×10^6, and Pr = 0.703, the frequency of vibration is 0 ≤ f ≤ 20Hz; and the amplitude is b mm), with possible exclusion of the highest positive and negative eccentricities. Plots of the average Nusselt number variation against the Rayleigh number showed a significant increase in negative vertical eccentricity. It was found that the average Nusselt decreased as the internal cylinder changed its location vertically from negative to positive through the center, which is normally a desirable effect, but has no advantage over the concentric on the positive side. The Rayleigh number was found to be relatively sensitive to eccentricity. However, an increase of Rayleigh number leads to a nearly proportional increase in the average Nusselt number and a smaller yet still substantial increase in positive eccentricity. This study concluded that the vibration under the current experimental setup significantly affects the concentric position of the internal cylinder, whether the effect is positive or negative. The vibrational average Nusselt number increased in varying proportions, depending on the location of the heated inner cylinder.

Słowa kluczowe

EN

cylindrical annulus; concentric; vertically eccentric; vibration inner cylinder

PL

drgania wymuszone; cylinder; drgania

• Wydawca: Polskie Towarzystwo Diagnostyki Technicznej
• Czasopismo: Diagnostyka
• Rocznik: 2023
• Tom: Vol. 24, No. 2
• Strony: art. no. 20230212
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Khudhair Baydaa K.

• Mechanical Engineering Department, University of Technology, Iraq

• https://orcid.org/0000-0002-3317-7625

autor

Saleh Adel M.

• Mechanical Engineering Department, University of Technology, Iraq

• https://orcid.org/0000-0002-0422-1308

autor

Ekaid Ali L.

• Mechanical Engineering Department, University of Technology, Iraq

• https://orcid.org/0000-0002-1430-6970

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).