Numerical Investigation of Non-Newtonian Flow and Heat Transfer Characteristics in Rectangular Tubes with ProtrusionsReport as inadecuate




Numerical Investigation of Non-Newtonian Flow and Heat Transfer Characteristics in Rectangular Tubes with Protrusions - Download this document for free, or read online. Document in PDF available to download.

Mathematical Problems in Engineering - Volume 2015 2015, Article ID 121048, 11 pages -

Research ArticleSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China

Received 30 August 2014; Accepted 23 October 2014

Academic Editor: Haochun Zhang

Copyright © 2015 Yonghui Xie et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Flow characteristics and heat transfer performances in rectangular tubes with protrusions are numerically investigated in this paper. The thermal heat transfer enhancement of composite structures and flow resistance reduction of non-Newtonian fluid are taken advantage of to obtain a better thermal performance. Protrusion channels coupled with different CMC concentration solutions are studied, and the results are compared with that of smooth channels with water flow. The comprehensive influence of turbulence effects, structural effects, and secondary flow effects on the CMC’s flow in protrusion tubes is extensively investigated. The results indicate that the variation of flow resistance parameters of shear-thinning power-law fluid often shows a nonmonotonic trend, which is different from that of water. It can be concluded that protrusion structure can effectively enhance the heat transfer of CMC solution with low pressure penalty in specific cases. Moreover, for a specific protrusion structure and a fixed flow velocity, there exists an optimal solution concentration showing the best thermal performance.





Author: Yonghui Xie, Zheyuan Zhang, Zhongyang Shen, and Di Zhang

Source: https://www.hindawi.com/



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