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Research Papers: Micro/Nanoscale Heat Transfer

Experimental Study on the Enhancement of Mass Transfer Utilizing Fe3O4 Nanofluids

[+] Author and Article Information
Lianying Zhang

Group of the Building Energy &
Sustainability Technology,
Shaanxi Engineering Research Center of
Building Environment and Energy,
School of Human Settlement and
Civil Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: zhangly@xjtu.edu.cn

Yuanyuan Liu

Group of the Building Energy &
Sustainability Technology,
School of Human Settlement and
Civil Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: luckyyuan@stu.xjtu.edu.cn

Yuan Wang

Group of the Building Energy &
Sustainability Technology,
School of Human Settlement and
Civil Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: wangyuan0627@stu.xjtu.edu.cn

Liwen Jin

Group of the Building Energy &
Sustainability Technology,
Shaanxi Engineering Research Center of
Building Environment and Energy,
School of Human Settlement and
Civil Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: lwjin@xjtu.edu.cn

Qunli Zhang

Beijing Key Lab of Heating, Gas Supply,
Ventilating and Air Conditioning Engineering,
Beijing University of
Civil Engineering and Architecture,
No. 1, Zhanlanguan Road, Xicheng District,
Beijing 100044, China
e-mail: zhangqunli@bucea.edu.cn

Wenju Hu

Beijing Key Lab of Heating, Gas Supply,
Ventilating and Air Conditioning Engineering,
Beijing University of
Civil Engineering and Architecture,
No. 1, Zhanlanguan Road, Xicheng District,
Beijing 100044, China
e-mail: huwenju@bucea.edu.cn

1Corresponding author.

Presented at the 5th ASME 2016 Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6330.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 5, 2016; final manuscript received June 29, 2017; published online August 23, 2017. Assoc. Editor: Chun Yang.

J. Heat Transfer 140(1), 012404 (Aug 23, 2017) (8 pages) Paper No: HT-16-1440; doi: 10.1115/1.4037398 History: Received July 05, 2016; Revised June 29, 2017

The absorption air-conditioning system is a low-power-consumption and low-noise system and is also good at balancing the electricity peak-valley system. It can be driven by low-grade energy, such as solar energy and industrial exhaust heat. The nanofluids, which possess the superior thermophysical properties, exhibit a great potential in enhancing heat and mass transfer. In this paper, nanofluids of H2O/LiBr with Fe3O4 nanoparticles were introduced into absorption air conditioning system. The effects of critical parameters, such as the flow rate of H2O/LiBr nanofluids, nanoparticle size and mass fraction, on the falling film absorption were investigated. The H2O/LiBr nanofluids with Fe3O4 nanoparticle mass fractions of 0.01 wt %, 0.05 wt % and 0.1 wt %, and nanoparticle sizes of 20 nm, 50 nm and 100 nm were tested. The results imply that the vapor absorption rate could be improved by adding the nanoparticles to H2O/LiBr solution. The smaller the nanoparticle size, the greater the enhancement of the heat and mass transfer. The absorption enhancement ratio increases sharply at first by increasing the nanoparticle mass fraction within a range of relatively low mass fraction and then exhibits a slow growing even reducing trends with increasing the mass fraction further. For Fe3O4 nanoparticle mass fraction of 0.05 wt % and nanoparticle size of 20 nm, the maximum mass transfer enhancement ratio is achieved about 2.28 at the flow rate of 100 L h−1. Meanwhile, a fitting formula of mass transfer enhancement ratio for Fe3O4 nanofluids has been improved.

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Figures

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Fig. 1

Schematic diagram for falling film absorption experiment

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Fig. 2

Comparison between basefluids and nanofluids standing for 24 h

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Fig. 3

Scanning electron microscope photographs of several diameters of Fe3O4 nanoparticles: (a) 20 nm, (b) 50 nm, and (c) 100 nm

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Fig. 4

Effect of solution flow rate on concentration difference

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Fig. 5

Absorption rate of water vapor versus solution flow rate

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Fig. 6

Concentration difference versus solution flow rate with adding different size of nanoparticles

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Fig. 7

Absorption rate of water vapor versus nanofluids flow rate

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Fig. 8

Mass transfer enhancement performance by nanoparticles: comparisons of different volume flow rate and nanoparticle size

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Fig. 9

Concentration difference versus nanoparticles' mass fraction

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Fig. 10

Absorption rate of water vapor versus nanoparticles' mass fraction

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Fig. 11

Mass transfer enhancement ratio versus nanoparticles' mass fraction

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Fig. 12

Comparison between the fitted values and the experimental values

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Fig. 13

Comparison between the improved fitted values and the experimental values

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