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Research Papers

Enhanced Mass Transfer Rates in Nanofluids: Experiments and Modeling

[+] Author and Article Information
Ratnesh U. Khanolkar

Department of Chemical Engineering,
Indian Institute of Technology Bombay,
Mumbai, Maharashtra 400076, India
e-mail: ratneshk1@gmail.com

A. K. Suresh

Professor
Department of Chemical Engineering,
Indian Institute of Technology Bombay,
Mumbai, Maharashtra 400076, India
e-mail: aksuresh@iitb.ac.in

Manuscript received February 27, 2014; final manuscript received October 22, 2014; published online May 14, 2015. Assoc. Editor: Yogesh Jaluria.

J. Heat Transfer 137(9), 091008 (Sep 01, 2015) (6 pages) Paper No: HT-14-1098; doi: 10.1115/1.4030219 History: Received February 27, 2014; Revised October 22, 2014; Online May 14, 2015

Enhancement in carbon dioxide absorption in water has been studied using SiO2 and TiO2 nanoparticles using the capillary tube apparatus for which previous results on Fe3O4 nanoparticles were reported earlier. Enhancements of up to 165% in the mass transfer coefficients were observed at fairly low volume fractions of the particles. A model which accounts for the effect of particles in terms of a superimposed convection has been proposed to explain the observed effects of particle size, hold-up, and material density. The model provides a good fit to the data from wetted wall column and capillary tube experiment for Fe3O4 from the previous literature, as well as for the data from this work.

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Figures

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Fig. 1

Schematic of the capillary tube experimental setup

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Fig. 3

Variation of mass transfer coefficient kL versus time for different nanoparticles. In all cases, the experiment was repeated at least twice, and the error bars show the maximum variation among the replicates.

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Fig. 2

A linear variation of the change in the length of the gas slug with t. The filled symbols are calculated from the model developed in this work and are discussed toward the end.

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Fig. 4

Ep experimental versus Ep predicted using correlation proposed in previous work [10]

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Fig. 5

Enlarged view of the interface

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Fig. 6

Graph of experimental enhancement versus enhancement predicted. The dotted lines are drawn for ±15% deviation. CAP—experiments in capillary tube apparatus; WWC—wetted wall column; MDEA—methyl diethanolamine is used as solvent for absorption (water is used as solvent for all other cases); Poly—polymer stabilized and TMAOH—tetra methyl ammonium hydroxide stabilized nanoparticles.

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Fig. 7

Figure showing particle size distribution of silica nanoparticles

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Fig. 8

Figure showing lognormal particles size distribution of TiO2 nanoparticles (provided by Professor P. Biswas, Washington University in St. Louis)

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