Near-wall focusing of phase change micro-particles for local heat transfer enhancement

Andrej Lenert; Youngsuk Nam; Matthew W. Thoms; Bekir S. Yilbas; Evelyn N. Wang

doi:10.1115/imece2011-64517

Near-wall focusing of phase change micro-particles for local heat transfer enhancement

Andrej Lenert, Youngsuk Nam, Matthew W. Thoms, Bekir S. Yilbas, Evelyn N. Wang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Citation (Scopus)

Abstract

We report the effect of confining micron-sized phase-change particles to a layer near the heated wall of a parallel plate channel. We developed a numerical model which assumes fully-developed laminar flow and a constant heat flux applied to one wall. Melting of the confined phase-change particles is incorporated in the model using a spatially-dependent and temperature-dependent effective heat capacity. We investigated the effect of channel height, height of the phase-change particle layer, heat flux, and fluid properties on the peak local Nusselt number (Nu^*) and the averaged Nusselt number over the melting length (Nu_melt). Compared to the base Nusselt number for this geometry (Nu_o = 5.385), Nu_melt and Nu ^* enhancements were determined to be as high as 15% and 45%, respectively. For a constant mass fraction of particles in the phase-change layer, Nu_melt is optimized when the phase-change particles are confined to within 35% of the channel width. These studies suggest a strategy to enhance heat transfer with phase change particles for various thermal-fluidic systems.

Original language	English
Title of host publication	Heat and Mass Transport Processes
Publisher	American Society of Mechanical Engineers (ASME)
Pages	619-626
Number of pages	8
Edition	PARTS A AND B
ISBN (Print)	9780791854969
DOIs	https://doi.org/10.1115/imece2011-64517
Publication status	Published - 2011
Event	ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States Duration: 11 Nov 2011 → 17 Nov 2011

Publication series

Name	ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Number	PARTS A AND B
Volume	10

Conference

Conference	ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Country/Territory	United States
City	Denver, CO
Period	11/11/11 → 17/11/11

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10.1115/imece2011-64517

Cite this

Lenert, A., Nam, Y., Thoms, M. W., Yilbas, B. S., & Wang, E. N. (2011). Near-wall focusing of phase change micro-particles for local heat transfer enhancement. In Heat and Mass Transport Processes (PARTS A AND B ed., pp. 619-626). (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; Vol. 10, No. PARTS A AND B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/imece2011-64517

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abstract = "We report the effect of confining micron-sized phase-change particles to a layer near the heated wall of a parallel plate channel. We developed a numerical model which assumes fully-developed laminar flow and a constant heat flux applied to one wall. Melting of the confined phase-change particles is incorporated in the model using a spatially-dependent and temperature-dependent effective heat capacity. We investigated the effect of channel height, height of the phase-change particle layer, heat flux, and fluid properties on the peak local Nusselt number (Nu*) and the averaged Nusselt number over the melting length (Numelt). Compared to the base Nusselt number for this geometry (Nuo = 5.385), Numelt and Nu * enhancements were determined to be as high as 15% and 45%, respectively. For a constant mass fraction of particles in the phase-change layer, Numelt is optimized when the phase-change particles are confined to within 35% of the channel width. These studies suggest a strategy to enhance heat transfer with phase change particles for various thermal-fluidic systems.",

author = "Andrej Lenert and Youngsuk Nam and Thoms, {Matthew W.} and Yilbas, {Bekir S.} and Wang, {Evelyn N.}",

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Lenert, A, Nam, Y, Thoms, MW, Yilbas, BS & Wang, EN 2011, Near-wall focusing of phase change micro-particles for local heat transfer enhancement. in Heat and Mass Transport Processes. PARTS A AND B edn, ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011, no. PARTS A AND B, vol. 10, American Society of Mechanical Engineers (ASME), pp. 619-626, ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011, Denver, CO, United States, 11/11/11. https://doi.org/10.1115/imece2011-64517

Near-wall focusing of phase change micro-particles for local heat transfer enhancement. / Lenert, Andrej; Nam, Youngsuk; Thoms, Matthew W. et al.
Heat and Mass Transport Processes. PARTS A AND B. ed. American Society of Mechanical Engineers (ASME), 2011. p. 619-626 (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; Vol. 10, No. PARTS A AND B).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Wang, Evelyn N.

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N2 - We report the effect of confining micron-sized phase-change particles to a layer near the heated wall of a parallel plate channel. We developed a numerical model which assumes fully-developed laminar flow and a constant heat flux applied to one wall. Melting of the confined phase-change particles is incorporated in the model using a spatially-dependent and temperature-dependent effective heat capacity. We investigated the effect of channel height, height of the phase-change particle layer, heat flux, and fluid properties on the peak local Nusselt number (Nu*) and the averaged Nusselt number over the melting length (Numelt). Compared to the base Nusselt number for this geometry (Nuo = 5.385), Numelt and Nu * enhancements were determined to be as high as 15% and 45%, respectively. For a constant mass fraction of particles in the phase-change layer, Numelt is optimized when the phase-change particles are confined to within 35% of the channel width. These studies suggest a strategy to enhance heat transfer with phase change particles for various thermal-fluidic systems.

AB - We report the effect of confining micron-sized phase-change particles to a layer near the heated wall of a parallel plate channel. We developed a numerical model which assumes fully-developed laminar flow and a constant heat flux applied to one wall. Melting of the confined phase-change particles is incorporated in the model using a spatially-dependent and temperature-dependent effective heat capacity. We investigated the effect of channel height, height of the phase-change particle layer, heat flux, and fluid properties on the peak local Nusselt number (Nu*) and the averaged Nusselt number over the melting length (Numelt). Compared to the base Nusselt number for this geometry (Nuo = 5.385), Numelt and Nu * enhancements were determined to be as high as 15% and 45%, respectively. For a constant mass fraction of particles in the phase-change layer, Numelt is optimized when the phase-change particles are confined to within 35% of the channel width. These studies suggest a strategy to enhance heat transfer with phase change particles for various thermal-fluidic systems.

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Y2 - 11 November 2011 through 17 November 2011

ER -

Lenert A, Nam Y, Thoms MW, Yilbas BS, Wang EN. Near-wall focusing of phase change micro-particles for local heat transfer enhancement. In Heat and Mass Transport Processes. PARTS A AND B ed. American Society of Mechanical Engineers (ASME). 2011. p. 619-626. (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; PARTS A AND B). doi: 10.1115/imece2011-64517

Near-wall focusing of phase change micro-particles for local heat transfer enhancement

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