上下に細長い開口部を有する干渉管を付属させた水平円管の自然対流熱伝達について

概要

論文の詳細を見る
Heat transfer in natural convection around the horizontal cylinder was experimentally and analytically investigated in order to raise in the heat transfer coefficient and use natural energy efficiently. The horizontal cylinder involved was 50mm in diameter and 100mm in length, and was covered with concentric outer tubes. The outer tubes had slots on top and bottom, which were 3 mm in width and 100mm length. The clearance (c) between the horizontal cylinder and outer tubes was changed as 0.5 mm to ∞. Rayleigh number (Ra) was changed as 4 × 10^4 to 8 × 10^8. The fluids used were Rll, air, and water. The study showed that the Prandtl number (Pr) of the fluids influenced natural convective flow. More specifically, heat transfer in natural convection was restrained when the Prandtl number was relatively big like Rll (Pr = 4.5).
2003-02-28