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Entropy 2016, 18(8), 302; doi:10.3390/e18080302

Heat Transfer and Entropy Generation of Non-Newtonian Laminar Flow in Microchannels with Four Flow Control Structures

1
Key Laboratory of Thermal-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
2
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
3
Department of Mechanical and Power Engineering, School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Academic Editor: Brian Agnew
Received: 28 June 2016 / Revised: 31 July 2016 / Accepted: 8 August 2016 / Published: 12 August 2016
(This article belongs to the Special Issue Advances in Applied Thermodynamics II)
View Full-Text   |   Download PDF [4958 KB, uploaded 12 August 2016]   |  

Abstract

Flow characteristics and heat transfer performances of carboxymethyl cellulose (CMC) aqueous solutions in the microchannels with flow control structures were investigated in this study. The researches were carried out with various flow rates and concentrations of the CMC aqueous solutions. The results reveal that the pin-finned microchannel has the most uniform temperature distribution on the structured walls, and the average temperature on the structured wall reaches the minimum value in cylinder-ribbed microchannels at the same flow rate and CMC concentration. Moreover, the protruded microchannel obtains the minimum relative Fanning friction factor f/f0, while, the maximum f/f0 is observed in the cylinder-ribbed microchannel. Furthermore, the minimum f/f0 is reached at the cases with CMC2000, and also, the relative Nusselt number Nu/Nu0 of CMC2000 cases is larger than that of other cases in the four structured microchannels. Therefore, 2000 ppm is the recommended concentration of CMC aqueous solutions in all the cases with different flow rates and flow control structures. Pin-finned microchannels are preferred in low flow rate cases, while, V-grooved microchannels have the minimum relative entropy generation S’/S0 and best thermal performance TP at CMC2000 in high flow rates. View Full-Text
Keywords: non-Newtonian fluid; laminar heat transfer; entropy generation; flow control structures non-Newtonian fluid; laminar heat transfer; entropy generation; flow control structures
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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. (CC BY 4.0).

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Yang, K.; Zhang, D.; Xie, Y.; Xie, G. Heat Transfer and Entropy Generation of Non-Newtonian Laminar Flow in Microchannels with Four Flow Control Structures. Entropy 2016, 18, 302.

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