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ホーム アーカイブ 役員 今後の会合 American Society of Thermal and Fluids Engineering

NUMERICAL STUDY OF HEAT TRANSFER ENHANCEMENT IN LAMINAR AND TURBULENT FLOWIN ENHANCED TUBES WITH UNIFORM AND NON-UNIFORM THERMAL BOUNDARY CONDITIONS

Mattew Sandlin
Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37830, United States of America

Kashif Nawaz
Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

Anthony M. Jacobi
University of Illinois at Urbana-Champaign, Champaign, Illinois, 61820, United States of America

Xiaofei Wang
University of Illinois at Urbana-Champaign, Champaign, Illinois, 61820, United States of America

DOI: 10.1615/TFEC2020.hte.032058
pages 445-454

要約

Various types of tube enhancements have been proposed in order to increase heat transfer while minimizing any associated increases in pressure drop. This paper presents a numerical study of two different types of enhanced tubes: the relatively common twisted tape insert tube, and a novel tube with airfoil shaped pins on the inner surface. Each tube is studied in both the laminar and turbulent flow regime. In addition to the typical constant temperature and constant flux boundary conditions, a non-constant heat flux boundary condition is applied on one half of the tube, a situation which may be encountered when absorbing solar radiation. In general, each type of enhanced tube offers a thermal performance factor greater than unity at certain Re. In addition, the non-uniform heat flux boundary condition appears to function similarly as the uniform heat flux boundary condition.

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