An experimental and theoretical study of the solidification process of phase change materials in a horizontal annular enclosure

Gortych, Marta; Lipnicki, Zygmunt

doi:10.1016/j.applthermaleng.2019.114140

Cited by 17 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 7 shows a comparison of the experimental research [8] with the theoretical model studied in this work for similar external conditions. Theoretical calculations were made for water,…”

Section: Comparison Of the Theoretical Model With Experimental Datamentioning

confidence: 99%

“…Figure 7 shows a comparison of the experimental research [8] with the theoretical model studied in this work for similar external conditions. Theoretical calculations were made for water, which played the role of the PCM material in the aforementioned experiment, with the following parameters being used: = 0.04, = 13, = 10, = 1.5, = 0.5,̃= 8.2, and ̃= 0.26.As one can see, both sets of data showed significant agreement, which indicates the correctness of the theoretical model.…”

Section: Comparison Of the Theoretical Model With Experimental Datamentioning

confidence: 99%

“…In the work of Gortych et al [8], the solidification process of phase change materials in a horizontal annular enclosure was studied, both experimentally and theoretically. This work investigated the effect of free convection on the solidification process of a liquid in a horizontal annular channel, which was shown to be rather moderate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Study of the Solidification of a Phase Change Material in an Annular Space

Lipnicki

Małolepszy

2020

Energies

View full text Add to dashboard Cite

In this study, the process of the solidification of a PCM (phase change material) liquid in an annular space was analytically investigated with the use of a simplified quasi-steady-state model. This model described the phase change phenomenon with the cylindrical solidification front and with the solidification liquid overheated above the solidification temperature. One of the important novelties of the applied model was the determination of the coefficient of the heat transfer between the liquid and the solidified layer on the solidification surface, which was calculated as a function of the location of the solidification front. A method for calculating the variable coefficient of heat transfer on the surface of the solidification front during the solidification process is presented. The contact layer between the cold wall and the solidified layer was incorporated into the model and played an important role. The theoretical analytical method describing the solidification process based on the quasi-steady model was used in the study. Moreover, the main problem considered in this work could be reduced to a conjugate system of differential equations, allowing it to be solved numerically. From this perspective, the influence of various dimensionless parameters on the solidification process could be clearly seen. The obtained numerical results are presented in graphical form. The results of the theoretical research were compared with the experimental research of one of the author’s earlier works and they showed a significant agreement. Finally, the simple analytical approach presented in this work can be used for designing annular heat accumulators.

show abstract

“…Figure 7 shows a comparison of the experimental research [8] with the theoretical model studied in this work for similar external conditions. Theoretical calculations were made for water,…”

Section: Comparison Of the Theoretical Model With Experimental Datamentioning

confidence: 99%

Section: Comparison Of the Theoretical Model With Experimental Datamentioning

confidence: 99%

See 1 more Smart Citation

Analytical Study of the Solidification of a Phase Change Material in an Annular Space

Lipnicki

Małolepszy

2020

Energies

View full text Add to dashboard Cite

show abstract

“…The authors proposed a correlation between non-dimensional melting time and liquid fraction. Gortych et al [ 31 ] experimentally and theoretically studied the solidification of PCM in a horizontally mounted annular cavity. The inner cylinder wall was marinated at a temperature less than the solidification temperature.…”

Section: Introductionmentioning

confidence: 99%

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

et al. 2021

View full text Add to dashboard Cite

In the present study, the thermal energy storage of a hot petal tube inside a shell-tube type Thermal Energy Storage (TES) unit was addressed. The shell is filled with the capric acid Phase Change Material (PCM) and absorbs the heat from a hot U-tube petal. The governing equations for the natural convection flow of molten PCM and phase change heat transfer were introduced by using the enthalpy-porosity approach. An automatic adaptive mesh scheme was used to track the melting interface. The accuracy and convergence of numerical computations were also controlled by a free step Backward Differentiation Formula. The modeling results were compared with previous experimental data. It was found that the present adaptive mesh approach can adequately the melting heat transfer, and an excellent agreement was found with available literature. The effect of geometrical designs of the petal tube was investigated on the melting response of the thermal energy storage unit. The phase change behavior was analyzed by using temperature distribution contours. The results showed that petal tubes could notably increase the melting rate in the TES unit compared to a typical circular tube. Besides, the more the petal numbers, the better the heat transfer. Using a petal tube could increase the charging power by 44% compared to a circular tube. The placement angle of the tubes is another important design factor which should be selected carefully. For instance, vertical placement of tubes could improve the charging power by 300% compared to a case with the tubes’ horizontal placement.

show abstract

“…The storage of thermal energy increases with the increase of the inner wall temperature and initial temperature of the solid PCM. The energy charged is greatly influenced by the change of the inner tube wall temperature compared to the change of the initial solid PCM temperature Gortychet al [14] examine the process of heat accumulation and heat release for PCM in an annular space analytically and experimentally. The results showed that the thickness of the solidification layer depending on time and the distribution of the local heat transfer coefficient on the surface of the solidification front.…”

Section: Introductionmentioning

confidence: 99%

Melting/Solidification Processes of PEG 1500 in Vertical and Horizontal Annular Enclosure

Hamad¹,

Egelle²,

Mohammed³

et al. 2021

JEPT

View full text Add to dashboard Cite

In this paper, the primary aim is to look at the fundamental melting/solidification processes of polyethylene glycol 1500 (PEG 1500) for energy storage – insulation to prolong the cooling time of pipelines in unexpected shut-down conditions, prevent/minimize the wax deposition, and hydrate formation. Polyethylene glycol 1500 was selected because its melting temperature is >317 K making it a suitable candidate as lagging material to prevent wax deposition and hydrate formation in subsea oil pipelines. Experimental apparatus was designed with the Perspex to give an insight into the melting process. Vertical and horizontal annular geometries were used to consider the real-life cases. The vertical annular enclosure length is 950 mm and 34 mm width (Height/Width=27.94). The horizontal annular enclosure length is 300mm and 15.9 mm width (Height/Width=18.87). The thermocouples and camera are used to collect the data for three cases of inner wall temperature of 333 K,343 K and 353 K where is the heat added to the phase change material (PCM) for both cases. The main conclusions are: i) the horizontal annular case melt faster than the vertical case, in particular, at higher heating surface temperature of 353 K, ii)The temperature of the inner region was remained hot for long time which provide a good evidence that support the concept of using the PCM as heat storage–insulation material; iii) the melting percentage for horizontal case is 100% higher from the melting percentage of vertical case at 333 K which reduced to about 20% for 343 K, iv) increasing the heating surface temperature substantially reduces the total melting time for both orientations.

show abstract

An experimental and theoretical study of the solidification process of phase change materials in a horizontal annular enclosure

Cited by 17 publications

References 23 publications

Analytical Study of the Solidification of a Phase Change Material in an Annular Space

Analytical Study of the Solidification of a Phase Change Material in an Annular Space

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

Melting/Solidification Processes of PEG 1500 in Vertical and Horizontal Annular Enclosure

Contact Info

Product

Resources

About