Numerical investigation of inward solidification inside spherical capsule by using temperature transforming method

Asker, Mustafa; Ganjehsarabi, Hadi; Çoban, Mustafa Turhan

doi:10.1016/j.asej.2016.02.009

Cited by 14 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6 illustrates the time-wise change of temperature at nine selected spots for three cases considering the aspect ratio W/H = 0.25. At the state of w/o NC (Figure 6A,B,C), the temperature readings at the points (1, 4, 7), (2,5,8), and (3,6,9) overlap over each other. The temperature at Point 7 increases rapidly than the other points since its location near the HTF inlet section.…”

Section: Validationmentioning

confidence: 99%

“…In addition, they examined different techniques to simulate the heat transfer in the modeling of the phase change problem. In order to attain good performance for TES, the PCM has been packed inside the storage tank with various encapsulation geometries such as a sphere, 8 cylinder, and plate 9 . In some studies related to this topic, Ismail and Henriquez 10 developed a numerical model to examine TES that comprise spherical capsules filled with PCM (water) placed inside a cylindrical tank.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance assessment of a phase change charging mode in a vertical thermal energy storage system

Asker

Akal

Ezan

2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

Summary In this work, the performance of a charging mode of a thermal energy storage system is investigated numerically, and results are assessed considering the first law and second law perspectives. The storage unit comprises parallel plates positioned vertically, and the heat transfer fluid flows within the spacing between the plates. The melting process of phase change material inside a rectangular enclosure is simulated considering the natural convection using an in‐house model codded in C++. The proposed model is validated with the numerical and experimental research from the literature. A parametric analysis is carried out to explore the influence of heat transfer inlet temperature and aspect ratio on the unit's first law and second law performance indicators. Analyses are also conducted by disregarding the natural convection to assess the convective mode of heat transfer on the time‐wise variation of the storage effectiveness and stored exergy. The results revealed that for the highest inlet temperature of the heat transfer fluid, the stored energy value increases from 133.85 to 250 kJ then drops to 240 kJ by varying the aspect ratio from 0.25 to 0.50 and from 0.50 to 1.00, respectively, for the natural convection dominated melting. On the other hand, regarding effectiveness, both with and without natural convection modes show the same aspect ratio variations trend. The effectiveness reduces from 0.9 to 0.40 by increasing the aspect ratio from 0.25 to 1.00 for the natural convection‐dominated melting mode. The effectiveness drops from 0.62 to 0.16 for the same variation in the aspect ratio for the conduction‐dominated melting mode. Besides, it is found that the highest stored exergy is observed in Case 9 w/NC situation with a stored exergy value of 13.3 kJ. The exergy efficiency changes approximately between 65% and 81% for all cases.

show abstract

Section: Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance assessment of a phase change charging mode in a vertical thermal energy storage system

Asker

Akal

Ezan

2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…By using the assumptions which are considered in our previous work, 23 the non-dimensional energy balance equation for the spherical container can be formulated as…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical simulation of thermal energy storage system inside a spherical capsule under periodic boundary conditions

2022

Self Cite

View full text Add to dashboard Cite

In this work, inward solidification process of a spherical capsule subjected to a periodic boundary condition is numerically studied. The temperature transforming technique is utilized to solve the 1D phase change model and an inhouse model developed in C++. The interface position and the transient temperature profiles are evaluated with respect to the different oscillation amplitudes and oscillation frequencies of the periodically oscillating surface temperature.The results demonstrate that in the situation where the amplitude is 30, the elapsed time for total solidification is dropped by 23.7% compared to the case without oscillation. It is also found that there is a 21.8% reduction in the time for total solidification when the frequency is changed from ω = π/64 to ω = 0.

show abstract

“…The results indicate that increase in the Biot number on the outer surface of the capsule leads to a lower freezing time of water. Asker et al 5 analyzed the inward solidification of PCM with a spherical container. Their results showed that the time of solidification is enhanced as the radius of the container is raised.…”

Section: Introductionmentioning

confidence: 99%

Simulation and performance analysis of a cooling energy storage system based on encapsulated nano‐enhanced phase change materials

et al. 2022

View full text Add to dashboard Cite

The present study investigates the effects of different parameters on the performance of a cold energy storage system based on spherical capsules using twoand three-dimensional (2D and 3D) numerical analyses. The effect of different arrangements of the capsules is studied using a 2D model. The impact of using nanoparticles, diameter, and material of a spherical capsule and working parameters that affect the melting and solidification process are evaluated in a 3D model. The results revealed that the hexagonal arrangement compared to the triangular and rectangular arrangements, yields a lower charging time of 10.71% and 16.67%, respectively. Utilization of a 3% volume fraction of graphene nanoparticles in the phase change material reduces the charging and discharging process time by 11.11% and 22.22%, respectively. The diameter of the capsule is an effective parameter for the charging and discharging time, so the capsule with a diameter of 20 mm in comparison with a diameter of 40 mm reduces the charging and discharging time by 71.1% and 66.67%, respectively. Also, capsules made of graphite yield lower charging process time compared to plastic and glass capsules by 17.39% and 5%, respectively.

show abstract

Numerical investigation of inward solidification inside spherical capsule by using temperature transforming method

Cited by 14 publications

References 32 publications

Performance assessment of a phase change charging mode in a vertical thermal energy storage system

Performance assessment of a phase change charging mode in a vertical thermal energy storage system

Numerical simulation of thermal energy storage system inside a spherical capsule under periodic boundary conditions

Simulation and performance analysis of a cooling energy storage system based on encapsulated nano‐enhanced phase change materials

Contact Info

Product

Resources

About