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Numerical simulation of heat transfer to separation tio(2)/water nanofluids flow in an asymmetric abrupt expansion

Oon, CS and Yew, SN and Chew, BT and Newaz, KMS and Al-Shamma'a, A and Shaw, A and Amiri, A (2015) Numerical simulation of heat transfer to separation tio(2)/water nanofluids flow in an asymmetric abrupt expansion. EPJ Web of Conferences: EFM14 - EXPERIMENTAL FLUID MECHANICS 2014, 92. ISSN 2100-014X

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Abstract

Abstract. Flow separation and reattachment of 0.2% TiO2 nanofluid in an asymmetric abrupt expansion is studied in this paper. Such flows occur in various engineering and heat transfer applications. Computational fluid dynamics package (FLUENT) is used to investigate turbulent nanofluid flow in the horizontal double-tube heat exchanger. The meshing of this model consists of 43383 nodes and 74891 elements. Only a quarter of the annular pipe is developed and simulated as it has symmetrical geometry. Standard k-epsilon second order implicit, pressure based-solver equation is applied. Reynolds numbers between 17050 and 44545, step height ratio of 1 and 1.82 and constant heat flux of 49050 W/m2 was utilized in the simulation. Water was used as a working fluid to benchmark the study of the heat transfer enhancement in this case. Numerical simulation results show that the increase in the Reynolds number increases the heat transfer coefficient and Nusselt number of the flowing fluid. Moreover, the surface temperature will drop to its lowest value after the expansion and then gradually increase along the pipe. Finally, the chaotic movement and higher thermal conductivity of the TiO2 nanoparticles have contributed to the overall heat transfer enhancement of the nanofluid compare to the water.

Item Type: Article
Uncontrolled Keywords: Science & Technology; Technology; Physical Sciences; Mechanics; Physics, Fluids & Plasmas; Physics
Subjects: Q Science > QC Physics
T Technology > T Technology (General)
Divisions: Built Environment
Publisher: E D P SCIENCES
Related URLs:
Date Deposited: 18 Aug 2015 15:03
Last Modified: 18 Aug 2015 15:03
DOI or Identification number: 10.1051/epjconf/20159202056
Editors: Dancova, P and Vit, T
URI: http://researchonline.ljmu.ac.uk/id/eprint/1863

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