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CFD assessment of the effect of nanoparticles on the heat transfer properties of acetone/ZnBr2 solution

Mohammed, Hayder I.; Giddings, Donald; Walker, Gavin S.; Power, Henry

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Authors

Hayder I. Mohammed

Gavin S. Walker

Henry Power



Abstract

A potential novel working fluid for vapour absorption refrigeration utilising very low grade waste heat, is based on acetone and zinc bromide as the salt solution. A Computational Fluid Dynamics (CFD) model is presented of the fluid with zinc oxide nano-particles in a flat tube flow. A two phase type of model represents the zinc oxide nano-particles as a distinct fluid phase. The cases of laminar and turbulent flow are explored numerically for a wide range of acetone and nanoparticles concentrations. The velocity is varied between 1.5 and 6 ms−1, representing typical heat exchanger conditions. Reynolds number depends significantly on the solution concentration. Heat transfer coefficient increases with Re, by turbulent mixing, and with the concentration of nanoparticles and of acetone by the enhanced thermal diffusivity. The shear wall stress is not affected by changing the concentration of nano-particles. The nano-fluid is demonstrated to work well for heat transfer enhancement over the base fluid; the further issue of suspension of the nano-particles in the solution is explored experimentally. The nano-fluid can be achieved by ultra-sonic excitation, with a settling time in the order of several hours. Subject to the particle suspension time being increased, this fluid combination is a good candidate for the application considered.

Citation

Mohammed, H. I., Giddings, D., Walker, G. S., & Power, H. (2018). CFD assessment of the effect of nanoparticles on the heat transfer properties of acetone/ZnBr2 solution. Applied Thermal Engineering, 128, https://doi.org/10.1016/j.applthermaleng.2017.08.169

Journal Article Type Article
Acceptance Date Aug 31, 2017
Online Publication Date Sep 6, 2017
Publication Date Jan 31, 2018
Deposit Date Sep 13, 2017
Publicly Available Date Sep 7, 2018
Journal Applied Thermal Engineering
Print ISSN 1359-4311
Electronic ISSN 1873-5606
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 128
DOI https://doi.org/10.1016/j.applthermaleng.2017.08.169
Keywords Nanofluid, acetone/zinc bromide, CFD, Heat transfer, flat tube, two phase approach
Public URL https://nottingham-repository.worktribe.com/output/907889
Publisher URL http://www.sciencedirect.com/science/article/pii/S1359431117356600
Contract Date Sep 13, 2017

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