Experimental Investigation into Natural Convection Heat Transfer inside Triangular Enclosure with Internal Hot Cylinder

Akeel Abdullah Mohammed; Ansam Adil Mohammed; Shylesha V. Channapattanac

doi:10.29194/NJES.26030175

Authors

Akeel Abdullah Mohammed Dept. of Mechanical Eng., Col-lege of Engineering, Al-Nahrain University, Baghdad- Iraq.
Ansam Adil Mohammed Dept. of Mechanical Eng., Col-lege of Engineering, Al-Nahrain University, Baghdad- Iraq.
Shylesha V. Channapattanac Mechanical Engineering KLS Vishwanathrao Deshpande Institute of Technology, Hali-yal, Karnataka, India.

DOI:

https://doi.org/10.29194/NJES.26030175

Keywords:

Laminar Flow, Natural Convection, Triangular Enclosure, Inclination Angle, Circular Cylinder

Abstract

Natural convection air heat transfer and fluid movement currents around a hot circular cylinder inside an inclined triangular enclosure has been analyzed experimentally. Three different sizes of an enclosure with a long side of 20, 25, and 30 cm, the thickness of 1 mm, and depth of 50 cm were used in the present work to give three radius ratios. The effect of Rayleigh number, radius ratio, the rotation angle of triangle enclosure, and the inclination angle of the apparatus with horizontal axis ? on the heat transfer process was investigated. The ranges of these parameters were: Rayleigh number from 5×10⁶to 2.5×10⁸, radius ratio (0.345, 0.455, and 0.618), rotation angle (0^o, 45^o, and 90^o), and inclination angle (0^o, 45^o and 90^o). The results show that the heat transfer rates increase with increase in Rayleigh number and as the rotation angle of enclosure is changed from 0^o to 90^o. Moreover, the heat transfer rate increases linearly with Rayleigh number at higher radius at rotation angle 0^o, 90^o only. While, it increases slightly with Rayleigh number at rotation angle 45^o. Additionally, the higher heat transfer rates occur at vertical position of enclosure inclination angle 90^o and rotation angle 0^o (the base of triangle at the bottom) and it decreases as inclination angle deviates from 90^o to 0^o. This behavior is reverse completely at higher radius ratio 0.618. Empirical correlations for the average Nusselt number has been found to depend on Rayleigh number., radius ratio, rotation angle and inclination angle.

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