A Study of Drag Force on Single Cylindrical Bodies in Open Channel Flow

Authors

  • Yuddhana Keokhumcheng Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep, Thailand

Keywords:

drag force, drag coefficient, dynamic force, hydrodynamics force, flowing force

Abstract

This study aimed to examine the characteristics of drag force by the flowing of water in an open channel through single cylindrical bodies with vertical alignment. The study was carried out by the simulation of flow conditions through single cylindrical bodies which were made by thin plate plastic with a smooth surface for 4 different cross-sections. The actual drag forces were determined by the experiment based on the equilibrium concept of moment by drag force on the submerged body and the resisting moment to the rotation of the body which caused the vertical alignment. The uniform drag force distribution over the submerged body was assumed in this study. The obtained actual drag forces from the experiment were compared with the theoretically calculated drag forces to obtain the drag coefficients. From the study in the range of 60,000 ≤ Re ≤ 210,000, it was found that the drag force was proportional to the Reynolds number of the flowing through the submerged body. The obtained drag coefficients were similar to each other which is slightly decreased. The obtained drag coefficients were 1.977, 1.747, 1.552 and 1.209 for the cylindrical bodies with rectangular, trapezoidal, equilateral triangle and circular section, respectively. Development of empirical formula for stress of drag force on submerged body was also performed which can be used to determine drag force on cylindrical body in the same conditions of this study.

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Published

2020-06-18

How to Cite

[1]
Y. . Keokhumcheng, “A Study of Drag Force on Single Cylindrical Bodies in Open Channel Flow”, UTK RESEARCH JOURNAL, vol. 14, no. 1, pp. 75–90, Jun. 2020.

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Section

Research Articles