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Research Papers

A Numerical Model for Ammonia/Water Absorption From a Bubble Expanding at a Submerged Nozzle Into a Binary Nanofluid

[+] Author and Article Information
Fengmin Su

Institute of Marine Engineering
and Thermal Science,
Dalian Maritime University,
1#, Linhai Road,
Dalian 116026, China
e-mail: fengminsu@dlmu.edu.cn

Hongbin Ma

Mem. ASME
University of Missouri–Columbia,
Columbia, MO 65211
e-mail: mah@missouri.edu

Yangbo Deng

Institute of Marine Engineering
and Thermal Science,
Dalian Maritime University,
1#, Linhai Road,
Dalian 116026, China
e-mail: dengyb1970@163.com

Nannan Zhao

Institute of Marine Engineering
and Thermal Science,
Dalian Maritime University,
1#, Linhai Road,
Dalian 116026, China
e-mail: znn@dlmu.edu.cn

1Corresponding author.

Manuscript received January 19, 2014; final manuscript received July 28, 2014; published online September 15, 2014. Assoc. Editor: Calvin Li.

J. Nanotechnol. Eng. Med 5(1), 010902 (Sep 15, 2014) (5 pages) Paper No: NANO-14-1004; doi: 10.1115/1.4028400 History: Received January 19, 2014; Revised July 28, 2014

An absorber is a major component in the absorption refrigeration systems, and its performance remarkably affects the overall system performance. A mathematical model for ammonia absorption from a bubble expanding at a submerged nozzle into a binary nanofluid was developed to analyze the effects of binary nanofluid on ammonia absorption in the forming process of a bubble. The combined effects of nanoparticles on heat transfer, mass transfer, and bubble size all were considered in the model. The concentration of nanoparticles, the radius of the nozzle, and the flow rate of ammonia vapor were considered as the key parameters. The numerical results showed that the enhancement of binary nanofluid for bubble absorption has the analogous tendency with the mass transfer enhancement of binary nanofluid. The diameter of the nozzle and the flow rate of ammonia vapor hardly affect the enhancement of the binary nanofluid for the absorption of bubble growing stage. The current investigation can result in a better understanding of the absorption process occurring in thermally driven absorption refrigeration systems.

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References

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Figures

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Fig. 1

Physical model of the NH3/H2O bubble absorption

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Fig. 10

Effective absorption ratio versus flow rate of ammonia vapor (CN = 0.5 vol. % and d0 = 2 mm)

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Fig. 9

Mean absorption rate versus flow rate of ammonia vapor (CN = 0.5 vol. % and d0 = 2 mm)

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Fig. 8

Effective absorption ratio versus nozzle diameter (CN = 0.5 vol. % and QN = 0.45 l/min)

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Fig. 7

Mean absorption rate versus nozzle diameter (CN = 0.5 vol. % and QN = 0.45 l/min)

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Fig. 6

Effective absorption ratio versus volume fraction of nanoparticles (d0 = 2 mm and QN = 0.45 l/min)

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Fig. 5

Mean absorption rate versus volume fraction of nanoparticles (d0 = 2 mm and QN = 0.45 l/min)

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Fig. 4

Mass diffusion and thermal conductivity enhancement in a nanofluid

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Fig. 3

Flowchart of the model

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Fig. 2

Solution concentration versus equilibrium temperature (P = 0.315 MPa)

Tables

Errata

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