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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015010648
pages 203-217

ESTIMATION OF THE LOSS COEFFICIENT FOR CONDUIT BENDS WITH CIRCULAR CROSS SECTION BY THE SECOND LAW APPROACH

Haochun Zhang
School of Energy Science and Engineering, Harbin institute of Technology, Harbin, 150001, China
Y.-Y. Guo
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
Hai-Yan Yu
School of Energy Science and Engineering, Harbin Institute of Technology
L.-M. Yan
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
Y. Ji
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
Y. Li
Institute of Composite Material, Harbin Institute of Technology, Harbin, China

ABSTRACT

Energy loss in a flow field occurs due to the dissipation of mechanical energy, and an accurate estimation of the loss coefficient is important for both energy conservation and engineering design. In the current study, the concept of the head loss coefficient K of a local structure for turbulent flows was extended to a laminar flow. The thermodynamic definition of K is proposed, and the value of K can be simulated by integrating the entropy production of the flow field. The Re dependence of K for a 90° bend with a circular cross section and 90° bend combinations was investigated using the second law approach. In addition, the correlation between K and the bending curvature was also derived.


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