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Title: Aluminum Foam-Phase Change Material Composites as Heat Exchangers

Abstract

The effects of geometric parameters of open-cell aluminum foams on the performance of aluminum foam-phase change material (PCM) composites as heat sinks are investigated by experiments. Three types of open-cell aluminum 6061 foams with similar relative densities and different cell sizes are used. Paraffin is selected as the PCM due to its excellent thermal stability and ease of handling. The experimental results show that the performance of the heat sink is significantly affected by the surface area density of the aluminum foam. In general, as the surface area density of the foam increases, the performance of the heat sink is improved regardless of the current phase of the PCM.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
947931
Report Number(s):
PNNL-SA-52080
VT0502020; TRN: US200905%%232
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: SAE 2007 World Congress & Exhibition, SP-2105:2007-01-0419
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHASE CHANGE MATERIALS; FOAMS; ALUMINIUM; COMPOSITE MATERIALS; HEAT EXCHANGERS; HEAT SINKS; PERFORMANCE TESTING; SURFACE AREA; Aluminum foam; Phase change materials; Heat exchanger

Citation Formats

Hong, Sung-tae, and Herling, Darrell R. Aluminum Foam-Phase Change Material Composites as Heat Exchangers. United States: N. p., 2007. Web.
Hong, Sung-tae, & Herling, Darrell R. Aluminum Foam-Phase Change Material Composites as Heat Exchangers. United States.
Hong, Sung-tae, and Herling, Darrell R. Sat . "Aluminum Foam-Phase Change Material Composites as Heat Exchangers". United States. doi:.
@article{osti_947931,
title = {Aluminum Foam-Phase Change Material Composites as Heat Exchangers},
author = {Hong, Sung-tae and Herling, Darrell R.},
abstractNote = {The effects of geometric parameters of open-cell aluminum foams on the performance of aluminum foam-phase change material (PCM) composites as heat sinks are investigated by experiments. Three types of open-cell aluminum 6061 foams with similar relative densities and different cell sizes are used. Paraffin is selected as the PCM due to its excellent thermal stability and ease of handling. The experimental results show that the performance of the heat sink is significantly affected by the surface area density of the aluminum foam. In general, as the surface area density of the foam increases, the performance of the heat sink is improved regardless of the current phase of the PCM.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 07 00:00:00 EDT 2007},
month = {Sat Apr 07 00:00:00 EDT 2007}
}

Conference:
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  • The effects of the surface area density of open-cell aluminum foams on the effective thermal conductivity of aluminum foam-phase change material (PCM) composites were investigated. Paraffin was selected as the PCM. The experimental results show that the effective thermal conductivity increases as the temperature increases. The experimental results suggest that the effective thermal conductivities can be different for different surface area densities of foams even though the relative densities of foams are similar. Therefore, for an accurate estimation of the effective thermal conductivity, a correlation including the surface area density effect is needed.
  • A theoretical and experimental study was conducted for convective evaporation and condensation in plate-fin compact heat exchangers. The overall performance of a brazed-aluminum heat exchanger in the evaporation mode with ammonia and in the condensation mode with both ammonia and refrigerant R-22 as working fluids. The heat exchanger has straight perforated fins on the working-fluid side and extruded rectangular channels on the single-phase (water) side. The two-phase flow in narrow channels of the heat exchanger is modeled using a triangular relationship between pressure gradient, liquid film flow rate, and film thickness. The overall performance of the heat exchanger is calculatedmore » by employing local heat-transfer analysis and integrating mass- and heat-balance equations along the heat-exchanger length. Theoretical predictions are found to agree favorably with experimental results for a prototypical heat exchanger unit.« less
  • A computational methodology is presented for solving natural convection dominated melting and resolidification of a phase change material around two horizontal cylindrical heat sources/sinks spaced vertically. A finite difference method with body-fitted coordinates is employed to handle the irregular boundaries, and a fixed grid enthalpy method is adopted for the phase change problem. Results show that the phase front during the melting and resolidification of the liquid from the upper cylinder is strongly affected by the surface temperature of the lower cylinder. Also, cyclic melting and freezing of the phase change material can result in complex shapes of the solid-liquidmore » interfaces as well as in multiple phase fronts. The shapes of the melted and solidified regions depend on the imposed thermal boundary and the melting and freezing period.« less
  • A process for producing a carbon foam heat sink is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications. The foam is encased and filled with a phase change material to provide a very efficient heat sink device.
  • A process for producing a carbon foam heat sink is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications. The foam is encased and filled with a phase change material to provide a very efficient heat sink device.