Affiliations 

  • 1 Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, 6351977439 Mahshahr, Iran
  • 2 Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
  • 3 Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, 9177948974 Mashhad, Iran
  • 4 Department of Mechanical Engineering, Faculty of Engineering, Islamic Azad University, Bushehr Branch, 7514944141 Bushehr, Iran
  • 5 School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
  • 6 Research Institute of Petroleum Industry, West Blvd., Near Azadi Sports Complex, 1485733111 Tehran, Iran
  • 7 Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
ACS Omega, 2019 Apr 30;4(4):7038-7046.
PMID: 31459815 DOI: 10.1021/acsomega.9b00176

Abstract

Many studies have investigated natural convection heat transfer from the outside surface of horizontal and vertical cylinders in both constant heat flux and temperature conditions. However, there are poor studies in natural convection from inclined cylinders. In this study, free convection heat transfer was examined experimentally from the outside surface of a cylinder for glycerol and water at various heat fluxes. The tests were performed at 10 different inclination angles of the cylinder, namely, φ = 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, and 90°, measured from the horizon. Our results indicated that the average Nusselt number reduces with the growth in the inclination of the cylinder to the horizon at the same heat flux, and the average Nusselt number enhanced with the growth in heat flux at the same angle. Also, the average Nusselt number of water is greater than that of glycerol. A new experimental model for predicting the average Nusselt number is suggested, which has a satisfactory accuracy for experimental data.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.