A Study on Melting Phenomena and Enhanced Heat Transfer of Phase Change Material by Ultrasonic Vibrations

2007 ◽  
Vol 345-346 ◽  
pp. 889-892 ◽  
Author(s):  
Ho Dong Yang ◽  
Yool Kwon Oh
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Fluid Dynamic ◽  
Computational Simulation ◽  
Melting Time ◽  
Liquid Region ◽  
Ultrasonic Vibrations ◽  
Enhanced Heat Transfer ◽  
Change Material

This study focused on observing the melting phenomena and investigated a principle factor of enhanced heat transfer in phase change material when the ultrasonic vibrations were applied during the melting process. For visualization, particle image velocimetry and thermal-vision camera for observing the flow phenomenon was used. Also, experiments were performed to obtain the experimental results such as melting time and temperature distribution. Besides, structural vibration simulator which is applying a coupled finite element-boundary element method (Coupled FE-BEM) was used for calculation of acoustic pressure occurred by ultrasonic vibrations in liquid region. The results of experimental and numerical observations show that acoustic streaming induced by ultrasonic vibrations is one of the prime effects acoustically enhanced phase change heat transfer and help to accelerate the melting of phase change material. Also, the application technique of visualization and computational simulation introduced in this study is very useful and important to analyze the mechanical behavior of material in a fast fluid dynamic or acoustic field.

Experimental and Numerical Study on the Melting Acceleration of Phase Change Material by Ultrasonic Vibrations

2006 ◽  
Vol 324-325 ◽  
pp. 1075-1078 ◽  
Author(s):  
Yool Kwon Oh ◽  
Ho Dong Yang
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Acoustic Pressure ◽  
Numerical Study ◽  
Ultrasonic Transducer ◽  
Acoustic Streaming ◽  
Melting Time ◽  
Ultrasonic Vibrations ◽  
Change Material

The present study was investigated on the melting phenomena and the accelerative factors of phase change material (PCM) by acoustic streaming induced ultrasonic vibrations. To investigate the melting phenomena and accelerative factors, the experimental study was measured the liquid temperature and melting time of PCM and was observed the velocity vectors and thermal fluid flow induced acoustic streaming to investigate the heat transfer using particle image velocimetry (PIV) and infrared thermo vision camera, respectively. Also, the numerical study based on a coupled finite element-boundary element method (Coupled FE-BEM) was performed to investigate the analysis of pressure field in the PCM. The results of experimental works revealed that acoustic streaming observed by PIV and infrared thermo vision camera is one of the prime effects accelerating phase change heat transfer. And, the final temperature of PCM is lower and melting speed is 2.6 times faster than that without ultrasonic vibrations when ultrasonic vibrations are applied. The results of numerical work presented that acoustic pressure is higher near the ultrasonic transducer than other points where no ultrasonic transducer was installed and develops more intensive flow such as acoustic streaming, destroying the flow instability. Moreover, the profile of acoustic pressure variation is consistent with that of enhancement of heat transfer.

Investigation of enclosure aspect ratio effects on melting heat transfer characteristics of metal foam/phase change material composites

2019 ◽  
Vol 29 (9) ◽  
pp. 2994-3011
Author(s):  
Amin Samimi Behbahan ◽  
Aminreza Noghrehabadi ◽  
C.P. Wong ◽  
Ioan Pop ◽  
Morteza Behbahani-Nejad
Keyword(s):  
Heat Transfer ◽  
Aspect Ratio ◽  
Phase Change ◽  
Phase Change Material ◽  
Metal Foam ◽  
Melting Time ◽  
Content Type ◽  
Aspect Ratios ◽  
Optimal Melting ◽  
Change Material

Purpose The purpose of this paper is to study thermal performance of metal foam/phase change materials composite under the influence of the enclosure aspect ratios (ratio of enclosure height: length). In this study, a compound metal foam/phase change material (PCM), which has been proved to be one of the most promising approaches for thermal conductivity promotion on PCMs, was used. Design/methodology/approach The PCM is considered initially at its melting temperature. The enclosure for all the cases has a constant volume with various aspect ratios. The left side of the enclosure is suddenly exposed to a thermal source having a constant heat flux, while the other three surfaces are kept thermally insulated. A two-dimensional numerical model considering the non-equilibrium thermal factor, non-Darcy effect and local natural convection was proposed. The coupling between velocity and pressure is solved using the SIMPLEC, and the Rhie and Chow interpolation is used to avoid the checker-board solutions for the pressure. Findings The effects of foam porosity and aspect ratio of the enclosure on the PCM’s melting time were investigated. The results indicated that enclosure aspect ratio plays a fundamental role in phase change of copper foam/PCM composites. For higher porosities, enclosures with bigger aspect ratios proved to led to optimal melting time. Besides, the best enclosure aspect ratio and foam porosity for a fixed-volume enclosure to have the shortest melting time are 2.1 and 91.66 per cent, respectively. However, for a specific amount of PCM inside a variable volume enclosure, the optimal melting time was for foam with ε = 95 per cent. The achieved results prove the great importance of selection of aspect ratio to benefit both conduction and convection heat transfer simultaneously. Originality/value The area of energy storage systems is original.

Nanoparticle enhanced paraffin and tailing ceramic composite phase change material for thermal energy storage

2020 ◽  
Vol 4 (9) ◽  
pp. 4547-4557
Author(s):  
Runfeng Li ◽  
Yang Zhou ◽  
Xili Duan
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Ceramic Composite ◽  
Physical Stability ◽  
Enhanced Heat Transfer ◽  
Composite Phase Change Material ◽  
Change Material ◽  
Transfer Properties

A nanoparticle-paraffin-tailing ceramic composite phase change material is developed with good chemical and physical stability and enhanced heat transfer properties.

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