Closed Cell Aluminium Foams with Phase Change Material

Kováčik, Jaroslav; Španielka, Ján; Dvorák, Tomáš; Oslanec, Peter; Jerz, Jaroslav

doi:10.23977/metf.2017.11003

Cited by 7 publications

(6 citation statements)

References 13 publications

(13 reference statements)

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“…The difference occurs at rpm starting at 1250, PCM aluminum higher engine temperature occurs because the material properties are very good for the cooling process, with easy heat transfer and heat stored in paraffin. PCM using aluminum allows it to absorb or dissipate heat In terms of materials, aluminum has the property of releasing heat more quickly and is lighter than steel (Kovacik;et al, 2017). Decrease in temperature after using PCM in the radiator inlet is 18,7%.…”

Section: Resultsmentioning

confidence: 99%

Efforts to Reduce the Temperature of the Coolant in the Radiator with PCM

Suhartoyo

2022

ARRUS J. Eng. Tech.

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This study aims to determine the effect of using PCM in reducing the temperature of the water entering the radiator from the engine. Two types of PCM used are made of aluminum and ST 37 steel. They are made like a box measuring 8 cm x 8 cm with a thickness of 2 mm, the center hole is 3.5 cm in diameter, totaling eight pieces. The Machine used is L 300 Colt engine. The results of the study explained that the decrease in engine temperature after using PCM reached 17.50C. While the use of PCM is very effective where the water coming out of the machine can be reduced by 17,830C. Engine speed at stationary conditions (800 rpm – 1100 rpm) aluminum PCM is more effective, but at engine speed starting (1250 rpm – 2000 rpm), the effective PCM is ST 37 steel.

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Section: Resultsmentioning

confidence: 99%

Efforts to Reduce the Temperature of the Coolant in the Radiator with PCM

Suhartoyo

2022

ARRUS J. Eng. Tech.

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“…The change of Rayleigh number is provided by changing of gravity value. Practically, the value of Ra = 1 refers to a case with very small values of gravity (such as a thermal storage system in space) or small cavity length which might be used for cooling of (Rubitherm, 2020), (Incropera and DeWitt, 1996)] electronic applications. Furthermore, the solution of Ra = 1 allows us to know mechanism of melting in the cavity with pure conduction heat transfer and compare with the results for high value of Raleigh number to recognize the effect of convection.…”

Section: Problem Statementmentioning

confidence: 99%

“…The number of studies on the heat transfer augmentation in solid/liquid phase change by using closed cell porous structure is too limited in literature. Kovacik et al (2017) The main disadvantage of a closed cell porous metal structure comparing to an open cell structure for heat transfer augmentation is that the convection effect is comparatively smaller than a porous structure with open cells, and this may cause the increase of phase change period.…”

Section: Introductionmentioning

confidence: 99%

“…The number of studies on the heat transfer augmentation in solid/liquid phase change by using closed cell porous structure is too limited in literature. Kovacik et al (2017) investigated the closed cell aluminum foam containing a phase change material for thermal storage in air-conditioning panels, experimentally. They developed and produced a closed-cell aluminum foam panel assisted by PCM as an alternative technology for conventional ceiling panels.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of heat transfer enhancement between open and closed cell porous metal structures for solid–liquid phase change

Wang

Sugiura

Mobedi

et al. 2023

HFF

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Purpose The purpose of this study is to analyze heat transfer for solid–liquid phase change in two inclined cavities assisted with open cell and closed cell porous structures for enhancement of heat transfer and compare them. Design/methodology/approach The heat transfer analysis is done numerically. The set of conservation equations for mass, momentum and energy for phase change material (PCM) and conduction heat transfer equation for metal frame are solved. Furthermore, temperature and solid–liquid fraction distributions for a cavity filled only with PCM are also obtained for comparison. The porosity is 0.9 for both porous structures. Rayleigh number and inclination angle change from 1 to 108, and from −90° to 90°, respectively. Findings The present study reveals that the use of closed cell structures not only can make phase change faster than open cell structure (except for Ra = 108 and = 90°) but also provide more stable process. The use of a closed cell porous structure in a cavity with PCM can reduce melting period up to 55% more than a cavity with an open cell porous structure. The rate of this additional enhancement depends on Rayleigh number and inclination angle. Originality/value To the best of the authors’ knowledge, this is the first time that the comparison between closed cell and open cell porous structures for heat transfer enhancement in a solid/liquid phase change process is reported. Authors believe that the present study will lead more attentions on the use of closed cell porous structures.

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“…There are some studies relating to the application of closed-cell porous media in literature. For instance, Kovacik et al (2017) experimentally researched the closed-cell aluminum foam samples and panels with phase change material (PCM). They developed closed-cell aluminum foam panels which can be an excellent alternative for large ceiling radiators for efficient heating or cooling of rooms using low potential energy resources.…”

Section: Simulation Of Heat Transfermentioning

confidence: 99%

Simulation of heat transfer in a closed-cell porous media under local thermal non-equilibrium condition

Wang

Mobedi

Kuwahara

2019

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Purpose The purpose of this study is to validate whether the local thermal equilibrium for unsteady state is an appropriate assumption for the porous media with closed pores. It also compares the transient temperatures between the pore scale and volume averaged approaches to prove that the volume averaged method is an appropriate technique for the heat transfer in closed-cell porous media. The interfacial heat transfer coefficient for the closed-cell porous media is also discussed in details. Design/methodology/approach The governing equations for the pore scale and continuum domains are given. They are solved numerically for the pore scale and volume-averaged domains. The results are compared and discussion was done. The performed discussions and explanations are supported with figure and graphics. Findings A local thermal non-equilibrium exits for the closed-cell porous media in which voids are filled with water during the unsteady heat transfer process. Local thermal non-equilibrium condition exists in the cells under high temperature gradient and it disappears when the heat transfer process becomes steady-state. Although a local thermal equilibrium exists in the porous media in which the voids are filled with air, a finite value for heat transfer coefficient is found. The thermal diffusivity of air and solid phase are close to each other and hence a local thermal equilibrium exists. Research limitations/implications The study is done only for the closed-cell porous media and for Rayleigh number till 105. Two common working fluids as water and air are considered. Practical implications There are many applications of porous media with closed pores particularly in the industry, such as the closed-cell metal foam or the closed cells in porous materials such as foods and plastic-based insulation material. The obtained results are important for transient heat transfer in closed-cell porous materials. Social implications The obtained results are important from the transient application of heat transfer in the closed-cell material existing in nature and industry. Originality/value The authors’ literature survey shows that it is the first time the closed-cell porous media is discussed from local thermal non-equilibrium point of view and it is proved that the local thermal non-equilibrium can exist in the closed-cell porous media. Hence, two equations as solid and fluid equations should be used for unsteady heat transfer in a closed-cell porous medium.

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Closed Cell Aluminium Foams with Phase Change Material

Cited by 7 publications

References 13 publications

Efforts to Reduce the Temperature of the Coolant in the Radiator with PCM

Efforts to Reduce the Temperature of the Coolant in the Radiator with PCM

Comparison of heat transfer enhancement between open and closed cell porous metal structures for solid–liquid phase change

Simulation of heat transfer in a closed-cell porous media under local thermal non-equilibrium condition

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