Melting and freezing around a horizontal cylinder placed in a square cavity

Sato, Masahiro; Komatsu, Yoshimi; Beer, H.

doi:10.1007/s00231-008-0403-7

Cited by 23 publications

(9 citation statements)

References 26 publications

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“…(9), and the Fourier and Stefan numbers are given by Eqs. (10) and (11). For small Stefan numbers, it can be readily shown that the right-hand side of Eq.…”

Section: Discussionmentioning

confidence: 99%

“…Various enclosures have been studied to maximize heat transfer rates between the PCM and carrier fluid in these systems including spheres, horizontal and vertical cylinders, rectangular cavities, and flat panel systems [4]. Among these, melting and freezing in cylindrical systems have been studied both analytically and experimentally where phase change has been measured using techniques including photographic visualization [5,6], intermittent weighing of PCM [7][8][9], and direct measurement of changes in PCM density [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Rahman

Shabgard

et al. 2016

Journal of Heat Transfer

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The inward melting and solidification of phase-change materials (PCM) within millimeter-scale cylindrical enclosures have been experimentally characterized in this work. The effects of cylinder size, thermal loading, and concentration of high-conductivity additives were investigated under constant temperature boundary conditions. Using a custom-built apparatus with fast response, freezing and melting have been measured for time periods as short as 15 s and 33 s, respectively. The enhancement of PCM thermal conductivity using exfoliated graphene nanoplatelets (xGnPs) has also been measured, showing a greater than 3× increase for a concentration of 6 wt.%. Reductions in the total melting and freezing times of up to 66% and 55%, respectively, have been achieved using xGnP concentrations of only 4.5 wt.%. It is shown that the phase-change dynamics of pure and enhanced PCM are well predicted using a simple conduction-only model, demonstrating the validity of approximating enhanced PCM with low additive loadings as homogenous materials with isotropic properties. While general consistency between the measurements and model is seen, the effect of additives on heat transfer rate during the initial stages of freezing and melting is lower than expected, particularly for the smaller cylinder sizes of 6 mm. These results suggest that the thermal resistance of the PCM is not the limiting factor dictating the speed of the solid–liquid interface during these initial stages.

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“…(9), and the Fourier and Stefan numbers are given by Eqs. (10) and (11). For small Stefan numbers, it can be readily shown that the right-hand side of Eq.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Rahman

Shabgard

et al. 2016

Journal of Heat Transfer

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“…Liu et al [12] performed a charging transient simulations based on a two dimensional numerical model, the melting processes of the storage units with staggered tube bundle structure and parallel tube bundle structure are compared with that of flat plate structure. Sugawara et al [13] investigated a freezing/melting of water/ice around a horizontal cylinder placed in a square cavity of the inner side length numerically.…”

Section: Introductionmentioning

confidence: 99%

Numerical & Experimental Investigation of Solidification Thickness around Cylindrical Surfaces for HVAC Cold Storage Systems

Abbas¹,

Tina²,

Badran³

2018

IJAERS

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“…To the best of author's knowledge, the detailed research about the melting of waxy crude oil in tank is not found in the literatures. However, a lot of researches [2][3][4][5][6] have studied the melting process of the phase changing material in the area of energy storage, electronics cooling and materials manufacturing. Khillarkar et al [3] employed Finite Element Method to study the melting characteristics and energy characteristics of n-octadecane in computation domain.…”

Section: Introductionmentioning

confidence: 99%

“…The study found that due to the effect of natural convection, the heat introduced from the hot boundary is mainly used to melt region of the computer domain, that is, the heat is mainly stored in the form of sensible heat in the upper region. Sugawara et al [4] studied the melting of the ice in a rectangular cavity caused by the heating of a horizontal circle tube and the condensation process of water in horizontal circular tube by numerical method. It is found that with the position rising of horizontal circular tube, melting or condensation efficiency within the region decreased gradually.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of melting of waxy crude oil in an oil tank

Wang

Zhang

et al. 2017

Applied Thermal Engineering

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：A safe and economic waxy crude oil melting scheme is an important issue in oil tank storage, and thus a better understanding of the melting mechanism of waxy crude oil in the tank is necessary to develop a scientific scheme for melting. With the consideration of wax precipitation and non-Newtonian behavior, this paper establishes physical and mathematical models for melting process of waxy crude oil in the tank, and then develops an integrative numerical procedure for the coupling of physical process within wax crystal porous media, solid-liquid dispersion system and pure liquid waxy crude oil. In this research, the non-Newtonian behavior is described by the power-law equation. The melting process is simulated by the enthalpy-porous media theory. The melting characteristics of waxy crude oil in the tank with Pr=354.3, Ra=1.0×10 6 and Ste=0.371 is investigated. Particularly, the effects of wax precipitation and non-Newtonian behavior are analyzed in detail. The results show that, during melting, the heat flux varies at different stages under different wax precipitation scenarios. At the initial melting stage, heat flux decreases with the increase of the wax precipitation, and in the natural convection melting stage, heat flux increases with the increase of wax precipitation. The effect of non-Newtonian behavior on melting process is influenced by the permeability constant of wax crystal porous media. When the permeability constant is small, non-Newtonian behavior has little effect on the melting process. Conversely, when the permeability constant is large, strengthening the non-Newtonian behavior will slow down the melting process.

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Melting and freezing around a horizontal cylinder placed in a square cavity

Cited by 23 publications

References 26 publications

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Experimental Characterization of Inward Freezing and Melting of Additive-Enhanced Phase-Change Materials Within Millimeter-Scale Cylindrical Enclosures

Numerical & Experimental Investigation of Solidification Thickness around Cylindrical Surfaces for HVAC Cold Storage Systems

Numerical investigation of melting of waxy crude oil in an oil tank

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