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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 8    August 2019

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Parametric study of natural convection over horizontal annular finned tube
H. NEMATI1, M. MORADAGHAY2

1. Department of Mechanics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran;
2. Department of Mechanics, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Abstract:Natural convection heat transfer from annular finned tubes was studied numerically. Effects of fin spacing, temperature difference and tube diameter on flow pathlines and local heat transfer were also studied. It was shown that pathlines remain mostly circular for different geometries. Moreover, the contributions of fin periphery, fin side and bare tube to heat transfer were specified. It was shown that the heat transfer per unit area of fin periphery can be several times that of other parts. Moreover, in higher finspacing, the heat transfer from the bare tube can be more important than fin sides.

 

Key words: natural convection; fin spacing; parametric study; annular finned tube

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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