In the absence of dispersants, surfactants or other deposition inhibiting techniques, nanoparticles contained in a base fluid could potentially deposit on channel walls. Nanoparticle layering has been shown to impact heat transfer coefficient, alter hydrodynamic characteristics including viscosity and flow regime, and influence the onset of boundary layers. The rate of deposition is a function of nanoparticle size, heat flux, microchannel hydraulic diameter, fluid velocity, temperature, adhesion properties and volume fraction. This paper presents an analytical investigation of nanoparticle deposition in microchannel heat exchanger systems. The objective of this study is to correlate the rate of deposition with nanoparticle size, microchannel hydraulic diameter, heat flux and volume fraction for transient flow conditions in which Brownian diffusion and thermophoresis are appreciable slip mechanisms of nanoparticle transport. A two-component four-equation nonhomogeneous thermal equilibrium model for mass, momentum and energy in nanofluids that includes nanoparticle mass transport into the channel walls is used in this analysis. An analytical model representing the transient distribution of nanoparticles in a channel is proposed.
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ASME 2011 International Mechanical Engineering Congress and Exposition
November 11–17, 2011
Denver, Colorado, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5492-1
PROCEEDINGS PAPER
Nanoparticle Deposition and Convective Transport in Microchannel Heat Exchanger Systems
Joshua P. Coleman,
Joshua P. Coleman
Purdue University Calumet, Hammond, IN
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A. G. Agwu Nnanna
A. G. Agwu Nnanna
Purdue University Calumet, Hammond, IN
Search for other works by this author on:
Joshua P. Coleman
Purdue University Calumet, Hammond, IN
A. G. Agwu Nnanna
Purdue University Calumet, Hammond, IN
Paper No:
IMECE2011-62957, pp. 1053-1062; 10 pages
Published Online:
August 1, 2012
Citation
Coleman, JP, & Nnanna, AGA. "Nanoparticle Deposition and Convective Transport in Microchannel Heat Exchanger Systems." Proceedings of the ASME 2011 International Mechanical Engineering Congress and Exposition. Volume 6: Fluids and Thermal Systems; Advances for Process Industries, Parts A and B. Denver, Colorado, USA. November 11–17, 2011. pp. 1053-1062. ASME. https://doi.org/10.1115/IMECE2011-62957
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