Abstract
Natural convection heat transfer from a vertical barrel-shaped solid/hollow cylinder to air in the infinite surroundings in a laminar regime ( 10 4 ≤ Ra ≤ 10 8 ) numerically analyzed. The effect of Ra , length-to-diameter ratio ( 2 ≤ L / D ≤ 10 ) , and maximum diameter-to-diameter ratio ( 1.2 ≤ D max / D ≤ 1.9 ) has been investigated on the heat dissipation to the surroundings. The heat dissipation and the Nu ¯ increase with Ra for solid/hollow cylinders. We found that Nu ¯ out is always larger than Nu ¯ in . At a high L / D ratio, heat dissipation from the inner surface of a hollow cylinder remains constant for the entire range of D max / D ratios. But at a low D max / D and high Ra (i.e. Ra ≥ 106), Nu ¯ out for a hollow cylinder significantly decreases with D max / D ; whereas, it shows a marginal decrement at a high L / D ratio. The thermo-fluid dynamics have been delineated through the thermal plume, velocity vectors, and vortex generation at the inner and outer surfaces. Empirical correlations have also been developed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
