Numerical Study of the Moving Boundary Problem During Melting Process in a Rectangular Cavity Heated from Below

Jellouli, Y.; Chouikh, R.; Guizani, Amenallah; Belghith, Abdelfettah

doi:10.3844/ajassp.2007.251.256

Cited by 23 publications

(12 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This clearly indicates that the early stage of heat transfer is conduction controlled, whereas at a while convection heat transfer becomes to be dominant. Similar transition from conduction to convection in heat transfer is also observed when heating is applied at bottom of the enclosure of the PCM [159].…”

Section: Increasing Heat Transfer Surfacesmentioning

confidence: 52%

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Kong

Hng

et al. 2014

Waste Energy Harvesting

View full text Add to dashboard Cite

In last two chapters, both methods to harvest waste thermal energy through the conversion to electricity. In this chapter, energy storage (ES) as an alternative method to harvest waste thermal energy, especially by using phase change materials (PCMs), will be presented.ES, as suggested by the name, is to store a certain form of energy, which thus be used later when necessary. A device that can be used to store any form of energy is generally called an accumulator. There are various forms of energy, commonly including kinetic energy, potential energy (e.g., gravitational or chemical), electrical energy, thermal energy, and so on. All these forms of energy could be stored by using an appropriate method [1,2]. For instance, mechanical energy can be stored by using hydrostorage, compressed air storage, and flywheels, while electrical energy is stored by using various batteries and supercapacitors. Thermal energy storage (TES) is the main content of this chapter.This chapter is arranged as follows. A brief description on various TES conceptions, together with a comparison, will be presented first. Among them, PCMs for TES will be emphasized. After that, PCMs with their classification according to their composition will be discussed. Design criteria, heat transfer phenomena, configuration of various PCM TES systems, which have been reported in open literature, will be summarized. Specific attention will be paid to the exergy analysis. The main applications of the PCM storage systems will be listed, analyzed, and compared. Strategies that have been used to improve the performance of such storage systems will be thoroughly evaluated. It will be ended with concluding remarks and perspectives of development of this technology.

show abstract

Section: Increasing Heat Transfer Surfacesmentioning

confidence: 52%

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Kong

Hng

et al. 2014

Waste Energy Harvesting

View full text Add to dashboard Cite

show abstract

“…The applications of the rectangular vessels can be found in nuclear reactors, solar energy systems, geothermal systems, etc. The rectangular or square designs used in LHTES systems are summarized in Table 1 32‐36 . Experiments and mathematical simulation of the effect of natural convection on the melting behavior of PCM in a rectangular vessel were performed by Lamberg et al 32 They found that the peak temperature of the PCM was achieved when the natural convection was absent.…”

Section: Configurations Of Lhtes Systems and Design Parametersmentioning

confidence: 99%

A comprehensive review of heat transfer intensification methods for latent heat storage units

et al. 2020

View full text Add to dashboard Cite

Latent heat thermal energy storage (LHTES) systems and their applications have been very substantive for the developments in energy science and engineering. The efficiency of LHTES systems largely depends on the thermal conductivity of the phase change materials (PCMs) and the heat transfer mechanisms in them. This review focuses on the methods employed to enhance heat transfer in LHTES systems which accordingly improve their storage performance. This includes the possible geometrical configurations of LHTES systems and the effects of their design parameters. The various methods adopted for enhancing LHTES systems' performance through either applying nanomaterials additives, using cascaded or encapsulated PCMs, or employing extended surfaces, such as fins, are discussed in detail. Additionally, various designs of PCM based heat exchangers with active and passive heat transfer techniques were highlighted. These systems are critically analyzed to help selecting reliable techniques and compatible materials for effective designs in order to achieve more efficient LHTES systems. This review would be helpful for the researchers to further develop heat transfer intensification mechanisms in LHTES systems.

show abstract

“…For the density measurements at the liquid state, the pycnometer is filled firstly with distilled water whose volume is defined in equation (3). Then, it is emptied, dried and filled with liquid paraffin until the stopper.…”

Section: Density Measurementsmentioning

confidence: 99%

“…They are classified into two groups according to the imposed boundary conditions: constant temperature, constant flux. Regarding to the first group, Jellouli et al [3] performed a numerical study of the melting process of a PCM with in a rectangular cavity heated from the bottom at a constant temperature. The natural convection was taken into account in the liquid PCM.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Characterization and Numerical Investigation of Three Paraffin Waxes as Latent Heat Storage Materials

Kraiem¹,

Karkri²,

S³

et al. 2019

Preprint

View full text Add to dashboard Cite

Thermophysical characterization of three paraffin waxes (RT27, RT21 and RT35HC) is carried out in this study using DSC, TGA and transient plane source technics. Then, a numerical study of their melting in a rectangular enclosure is examined. The enthalpy-porosity approach is used to formulate this problem in order to understand the heat transfer mechanism during the melting process. The analysis of the solid-liquid interface shape, the temperature field shows that the conduction is the dominant heat transfer mode in the beginning of the melting process. It is followed by a transition regime and the natural convection becomes the dominant heat transfer mode. The effects of the Rayleigh number and the aspect ratio of the enclosure on the melting phenomenon are studied and it is found that the intensity of the natural convection increases as the Rayleigh number is higher and the aspect ratio is smaller. In the second part of the numerical study, a comparison of the performance of paraffins waxes during the melting process is conducted. Results reveals that from a kinetically RT21 is the most performant but in term of heat storage capacity, it was inferred that RT35HC is the most efficient PCM.

show abstract

Numerical Study of the Moving Boundary Problem During Melting Process in a Rectangular Cavity Heated from Below

Cited by 23 publications

References 7 publications

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

A comprehensive review of heat transfer intensification methods for latent heat storage units

Thermophysical Characterization and Numerical Investigation of Three Paraffin Waxes as Latent Heat Storage Materials

Contact Info

Product

Resources

About