scholarly journals Simulation of frost formation process on cold plate based on fractal theory combined with phase change dynamics

2010 ◽  
Vol 59 (11) ◽  
pp. 7991
Author(s):  
Liu Yao-Min ◽  
Liu Zhong-Liang ◽  
Huang Ling-Yan
Keyword(s):  
Phase Change ◽  
Formation Process ◽  
Fractal Theory ◽  
Cold Plate ◽  
Frost Formation ◽  
Change Dynamics

Mini-channel cold plate with nano phase change material emulsion for Li-ion battery under high-rate discharge

2020 ◽  
Vol 279 ◽  
pp. 115808
Author(s):  
Jiahao Cao ◽  
Yangjing He ◽  
Jinxin Feng ◽  
Shao Lin ◽  
Ziye Ling ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
High Rate ◽  
Cold Plate ◽  
Li Ion Battery ◽  
Rate Discharge ◽  
Li Ion ◽  
High Rate Discharge ◽  
Change Material

A Theoretical and Experimental Investigation of Unidirectional Freezing of Nanoparticle-Enhanced Phase Change Materials

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
Liwu Fan ◽  
J. M. Khodadadi
Keyword(s):  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Experimental Setup ◽  
Cold Plate ◽  
Numerical Predictions ◽  
Unidirectional Freezing ◽  
Measured Thermal Conductivity

Highly-conductive nanostructures may be dispersed into phase change materials (PCM) to improve their effective thermal conductivity, thus leading to colloidal systems that are referred to as nanostructure-enhanced PCM (NePCM). Results of a theoretical and experimental investigation on freezing of NePCM in comparison to the base PCM are presented. A one-dimensional Stefan model was developed to study the unidirectional freezing of NePCM in a finite slab. Only the thermal energy equation was considered and the presence of static dispersed nanoparticles was modeled using effective media relations. A combination of analytical and integral methods was used to solve this moving boundary problem. The elapsed time to form a given thickness of frozen layer was therefore predicted numerically. A cooled-from-bottom unidirectional freezing experimental setup was designed, constructed, and tested. Thermocouple readings were recorded at several equally spaced locations along the freezing direction in order to monitor the progress of the freezing front. As an example, cyclohexane (C6H12) and copper oxide (CuO) nanoparticles were chosen to prepare the NePCM samples. The effective thermophysical and transport properties of these samples for various particle loadings (0.5/3.8, 1/7.5, and 2/14.7 vol. %/wt. %) were determined using the mixture and Maxwell models. Due to utilization of the Maxwell model for thermal conductivity of both phases, the numerical predictions showed that the freezing time is shortened linearly with increasing particle loading, whereas nonmonotonic expediting was observed experimentally. The maximum expediting was found to be nearly 8.23% for the 0.5 vol. % sample. In the absence of a nanoparticle transport model, the mismatch of the cold plate boundary conditions, lack of accurate thermophysical properties, especially in the solid phase of NePCM samples and precipitation issues with 2 vol. % samples were addressed by improving the experimental setup. Through adopting a copper cold plate, utilizing measured thermal conductivity data for both phases and using 1, 2, and 4 wt. % samples, good agreement between the experimental and numerical results were realized. Specifically, adoption of measured thermal conductivity values for the solid phase in the Stefan model that were originally underestimated proved to be a major cause of harmony between the experiments and predictions.

Phase change dynamics in a polymer thin film upon femtosecond and picosecond laser irradiation

2005 ◽  
Vol 247 (1-4) ◽  
pp. 440-446 ◽  
Author(s):  
J. Bonse ◽  
S.M. Wiggins ◽  
J. Solis ◽  
T. Lippert
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Laser Irradiation ◽  
Picosecond Laser ◽  
Polymer Thin Film ◽  
Change Dynamics

Real Time Measurements of Phase Change Dynamics

1998 ◽  
Vol 37 (Part 1, No. 4B) ◽  
pp. 2114-2115 ◽  
Author(s):  
Cyril Trappe ◽  
Bernard Béchevet ◽  
Stefan Facsko ◽  
Heinrich Kurz
Keyword(s):  
Phase Change ◽  
Real Time ◽  
Change Dynamics

Analysis of mark-formation process for phase-change media

1998 ◽  
Vol 4 (5) ◽  
pp. 826-831 ◽  
Author(s):  
M. Miyamoto ◽  
A. Hirotsune ◽  
Y. Miyauchi ◽  
K. Ando ◽  
M. Terao ◽  
...  
Keyword(s):  
Phase Change ◽  
Formation Process

Lattice Boltzmann Simulation of Frost Formation Process

2013 ◽  
Author(s):  
Jinjuan Sun ◽  
Jianying Gong ◽  
Guojun Li ◽  
Tieyu Gao
Keyword(s):  
Lattice Boltzmann ◽  
Formation Process ◽  
Moving Boundary ◽  
Influential Factors ◽  
Physical Models ◽  
Frost Formation ◽  
Flat Surfaces ◽  
Lattice Boltzmann Simulation ◽  
Complex Process ◽  
Moving Boundary Condition

Compared with the conventional mathematical and physical models, the lattice Boltzmann (LB) method is an effective method to simulate the heat and mass transfer in porous media. Frost crystallization aggregation is a very complex process involving inconsistency of frost structures, crystal size distributions, the complex transient shapes, and other numerous influential factors. Assuming the frost is a special porous medium consists of ice crystals and humid air, a mesoscopic model is established to predict the behavior of frost formation based on the lattice Boltzmann equation. The moving boundary condition is adopted in the two-dimensional nine-speed (D2Q9) lattices. The influences of the cold flat surfaces temperature on frost formation process are investigated. The variation laws of frost density and frost layer height are obtained and discussed. Simulation results by the LB model are in agreement with the experiment data from the references.

Sign in / Sign up

Export Citation Format

Share Document