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Research Papers: Two-Phase Flow and Heat Transfer

Numerical Investigation of Flow and Heat Transfer Performance of Nano-Encapsulated Phase Change Material Slurry in Microchannels

[+] Author and Article Information
Sarada Kuravi, Krishna M. Kota, Jianhua Du, Louis C. Chow

Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450

J. Heat Transfer 131(6), 062901 (Mar 31, 2009) (9 pages) doi:10.1115/1.3084123 History: Received December 31, 2007; Revised October 13, 2008; Published March 31, 2009

Microchannels are used in applications where large amount of heat is produced. Phase change material (PCM) slurries can be used as a heat transfer fluid in microchannels as they provide increased heat capacity during the melting of phase change material. For the present numerical investigation, performance of a nano-encapsulated phase change material slurry in a manifold microchannel heat sink was analyzed. The slurry was modeled as a bulk fluid with varying specific heat. The temperature field inside the channel wall is solved three dimensionally and is coupled with the three dimensional velocity and temperature fields of the fluid. The model includes the microchannel fin or wall effect, axial conduction along the length of the channel, developing flow of the fluid and not all these features were included in previous numerical investigations. Influence of parameters such as particle concentration, inlet temperature, melting range of the PCM, and heat flux is investigated, and the results are compared with the pure single phase fluid.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Size distribution of NEPCM particles in the slurry sample

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Figure 3

DSC curve of the NEPCM slurry

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Figure 4

Schematic of flow domain

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Figure 5

Drag on a spherical particle in a fluid field

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Figure 6

Nondimensionalized force F′ calculated using asymptotic analysis (25)

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Figure 7

Migration distance of a 100 nm particle in a 100 μm channel

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Figure 8

Particle melting process

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Figure 9

Tfm versus Rp to melt 99% of the particle at different residence times

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Figure 10

Specific heat of NEPCM as a function of temperature

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Figure 11

Comparison of results using current model with experiments in Ref. 12

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Figure 12

Pressure drop inside the channel as a function of particle mass concentration

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Figure 13

Bulk mean temperature rise as a function of particle mass concentration

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Figure 14

Nusselt number as a function of particle mass concentration

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Figure 15

Bulk temperature rise with varying inlet temperatures and melting ranges of PCM

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Figure 16

Nusselt number with varying inlet temperatures and melting ranges of PCM

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Figure 17

Bulk temperature rise for pure PAO and slurry at varying heat fluxes

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Figure 18

Nusselt number for pure PAO and slurry at varying heat fluxes

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