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Research Papers: Forced Convection

Fluid Flow and Heat Transfer Characteristics of Microencapsulated Phase Change Material Slurry in Turbulent Flow

[+] Author and Article Information
Hessam Taherian

Department of Mechanical Engineering,
University of Alabama at Birmingham,
1720 2nd Avenue S,
Birmingham, AL 35294
e-mail: taherian@uab.edu

Jorge L. Alvarado, Kalpana Tumuluri, Chan-Hyun Park

Department of Engineering Technology
and Industrial Distribution,
Texas A&M University,
3367 TAMU,
College Station, TX 77843

Curt Thies

Thies Technology Inc.,
921 American Pacific Dr. Suite 309,
Henderson, NV 89014

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 12, 2013; final manuscript received February 6, 2014; published online March 13, 2014. Assoc. Editor: Wilson K. S. Chiu.

J. Heat Transfer 136(6), 061704 (Mar 13, 2014) (7 pages) Paper No: HT-13-1298; doi: 10.1115/1.4026863 History: Received June 12, 2013; Revised February 06, 2014

Microencapsulated phase change material (MPCM) slurry is consisted of a base fluid in which MPCM is dispersed. Due to apparent high heat capacity associated with phase change process, MPCM slurry can be used as a viable heat transfer fluid (HTF) for turbulent flow conditions. Heat transfer and fluid flow properties of the slurry in turbulent flow (3000 < Re < 6000) were determined experimentally. Dynamic viscosity of the MPCM slurry was measured at different temperatures close to the melting point of the material (20–30 °C). Pressure drop measurements under turbulent flow conditions were recorded for 6 MPCM samples at various concentrations. The pressure drop of the MPCM slurry was comparable to that of water despite the higher viscosity of the slurry. The effect of heat flux, MPCM mass concentration, flow rate and the type of phase change material was investigated. The effective heat capacity of slurry at the location where phase change occurs was found to be considerably higher than that of water. A nondimensional Nusselt number correlation was proposed in order to facilitate design of heat transfer loops with MPCM slurries as working fluid.

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Figures

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Fig. 5

Measured apparent viscosity of MPCM slurries

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Fig. 4

The specific heat enhancement of an aqueous MPCM slurry as a function of the number of flow cycles

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Fig. 3

Schematic diagram of the heat transfer test loop

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Fig. 12

Effective heat capacity of aqueous MPCM slurries where the MPCMs contain the same PCM (methyl stearate)

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Fig. 2

SEM of MPCM Sample CT111909 that contains methyl stearate

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Fig. 1

Optical photomicrograph of MPCM sample CT110209A. Magnification: 400×.

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Fig. 6

Pressure drop of different MPCM slurries in a circular tube

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Fig. 7

The effect of heat flux on the value of heat transfer coefficient

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Fig. 8

The effect of the solid content on the heat transfer coefficient of MPCM slurry

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Fig. 9

The effect of slurry flow rate on the heat transfer coefficient of a 11 wt. % slurry of CT042709A MPCMs

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Fig. 10

The effect of slurry flow rate on the heat transfer coefficient of a 17 wt. % CT111909 MPCM slurry

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Fig. 11

The effect of the phase change material in the micro capsules on the heat transfer coefficient

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Fig. 13

Nu correlation for slurries of MPCMs containing as the PCM

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