scholarly journals Some aspects of the computer simulation of conduction heat transfer and phase change processes

1982 ◽  
Author(s):  
A. D. Solomon
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Phase Change ◽  
Change Processes ◽  
Conduction Heat Transfer

scholarly journals Simulation of a Fast-Charging Porous Thermal Energy Storage System Saturated with a Nano-Enhanced Phase Change Material

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1575
Author(s):  
Mohammad Ghalambaz ◽  
S.A.M. Mehryan ◽  
Hassan Shirivand ◽  
Farshid Shalbafi ◽  
Obai Younis ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Conduction Heat Transfer ◽  
Volume Fractions ◽  
Charging Time ◽  
Change Material

The melting of a coconut oil–CuO phase change material (PCM) embedded in an engineered nonuniform copper foam was theoretically analyzed to reduce the charging time of a thermal energy storage unit. A nonuniform metal foam could improve the effective thermal conductivity of a porous medium at regions with dominant conduction heat transfer by increasing local porosity. Moreover, the increase in porosity contributes to flow circulation in the natural convection-dominant regimes and adds a positive impact to the heat transfer rate, but it reduces the conduction heat transfer and overall heat transfer. The Taguchi optimization method was used to minimize the charging time of a shell-and-tube thermal energy storage (TES) unit by optimizing the porosity gradient, volume fractions of nanoparticles, average porosity, and porous pore sizes. The results showed that porosity is the most significant factor and lower porosity has a faster charging rate. A nonuniform porosity reduces the charging time of TES. The size of porous pores induces a negligible impact on the charging time. Lastly, the increase in volume fractions of nanoparticles reduces the charging time, but it has a minimal impact on the TES unit’s charging power.

scholarly journals Thermal management of photovoltaic panel with nano-enhanced phase change material at different inclinations

2021 ◽  
Author(s):  
UNNIKRISHNAN KARTHAMADATHIL SASIDHARAN ◽  
ROHINIKUMAR BANDARU
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Management ◽  
Thermal Energy ◽  
Liquid Fraction ◽  
Maximum Enhancement ◽  
Conduction Heat Transfer ◽  
Change Material

Abstract Photovoltaic (PV) panel, coupled with phase change material (PCM), has attracted broad attention for the panel's thermal management. Despite the higher energy storage capability of PCMs, the main disadvantage is their low thermal conductivity which is compensated to an extent with the nano-enhanced PCMs (NEPCMs). In this study, numerical simulations are carried out to compare the natural convection phenomena and thermal response of PV-NEPCM with simple PV-PCM for various tilt angles. CuO nanoparticles with a 4% volume concentration are selected for NEPCM. The thermal performance of PV-NEPCM at inclinations of 0°, 15°, 30°, and 45\(^\circ\) are compared with a simple PV-PCM system. The average temperature of PV, liquid fraction and thermal energy stored in PCM, the PV efficiency are compared for PV-PCM and PV-NEPCM systems. Results show that the loading of nanoparticles increases the conduction heat transfer inside PCM. It has also been shown that at lower inclinations, the use of NEPCM is more effective due to the dominance of conduction heat transfer. At higher tilt angles, natural convection plays a significant role in the heat transfer mechanism inside PCM. By using NEPCM, the maximum decrease in PV temperature of 1.11\(℃\) and maximum improvement in the liquid fraction (7.6%) are achieved when \({\theta }=0^\circ\) compared to simple PCM. Enhancement of thermal energy stored in PCM increases slightly upon adding nanoparticles, and the highest improvement is obtained for \({\theta }=0^\circ .\) Maximum enhancement of PV efficiency is found to be 1.6% for \({\theta }=0^\circ\) inclination on adding nanoparticles at a fraction of 4 vol.%. Keywords: PV, nano-enhanced PCM, nanoparticles, natural convection, liquid fraction.

Experimental Study of Electrohydrodynamic Induction Pumping of a Dielectric Micro Liquid Film in External Horizontal Condensation Process

2002 ◽  
Author(s):  
K. Brand ◽  
J. Seyed-Yagoobi
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Flux ◽  
Liquid Film ◽  
Phase Change ◽  
Traveling Wave ◽  
Change Process ◽  
Change Processes ◽  
Condensation Process ◽  
Flow Management

Electrohydrodynamic induction pumping of a dielectric micro condensation film is experimentally investigated in an external horizontal configuration. The pumping and its effect on heat transfer are explored by varying the voltage and frequency of the electric traveling wave, as well as the condensation heat flux. The induced pumping impacts the phase change process, but it provides first and foremost a tool for effective flow management. This is of significant importance in phase-change processes.

Proposed Modifications for Models of Heat Transfer Problems Involving Partially Melted Phase Change Processes

2009 ◽  
Vol 6 (9) ◽  
pp. 102059 ◽  
Author(s):  
Yuan Fang ◽  
Mario A. Medina ◽  
Phalguni Mukhopadhyaya ◽  
Mavinkal K. Kumaran ◽  
S. W. Dean
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Change Processes ◽  
Transfer Problems

2-D Computer Simulation of Rapid Solidification

2005 ◽  
Vol 494 ◽  
pp. 381-386 ◽  
Author(s):  
Z.S. Nikolić ◽  
M. Yoshimura ◽  
S. Araki
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Temperature Distribution ◽  
Phase Change ◽  
Complex Problem ◽  
Heat Transfer Process ◽  
Two Dimensional ◽  
Rapid Phase ◽  
Moving Interface ◽  
Phase Change Phenomena

Two-dimensional numerical model is adopted to analyze the heat transfer process during solidification of the sample melted in an Arc-image furnace. Numerical solution of this complex problem enabled us to calculate the temperature distribution in both sample and substrate, including the phase change phenomena. Also, the effects of process parameters on the solidification of the sample melted on substrate that is cooled by water can be investigated numerically. The parameters include sample size, contact area size between the sample and the substrate, and degree of undercooling associated with rapid phase change and moving interface. The results obtained reveal that these parameters have strong effect on temperature distribution during solidification.

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