Effect of the inclination angles on thermal energy storage in a quadrantal cavity

Ye, Wei‐Biao; Zhu, Dongsheng; Wang, Nan

doi:10.1007/s10973-011-2035-2

Cited by 25 publications

(2 citation statements)

References 20 publications

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“…Ye et al [29] numerically investigated the effect of system inclination angle on the melting of a paraffin (T m ≈ 27 °C) in a quadrantal cavity heated from the curved wall. Without any heat transfer enhancement within the PCM, the complete melting time for the system when the heated curved surface was at bottom of the system and the gravity vector bisects the quadrantal cavity was approximately 13 % of that when it was rotated 180°.…”

Section: Introductionmentioning

confidence: 99%

Effect of inclination angle during melting and solidification of a phase change material using a combined heat pipe-metal foam or foil configuration

Allen

Sharifi

Faghri

et al. 2015

International Journal of Heat and Mass Transfer

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Experiments are performed to analyze the impact of system inclination (ranging from 0° to 90°) on the melting and solidification of a phase change material (PCM) in a cylindrical enclosure. Heat transfer occurs through a concentrically located heat pipe (HP) or solid copper rod and an underlying copper disc. The HP may also be combined with aluminum foils and foam. Six configurations are investigated: HP-Foil-PCM, HP-Foam-PCM, HP-PCM, Rod-PCM, Foam-PCM and non-enhanced PCM.The PCM liquid fraction histories, temperature distributions and photographs provide insight into the influence of the inclination angle, as well as the three-dimensional melting phenomena. Experimental measurements indicate that the system orientation has a minimal effect on the solidification rates for nearly all case studies due to conduction-dominated heat transfer. However, during melting, the presence of natural convection may significantly alter the liquid fraction histories for systems without foam or foils. For the HP-PCM and Rod-PCM configurations with a horizontal orientation, the liquid fraction may be increased by up to 0.09 and 0.20 compared to a vertical orientation for a system with and without heat transfer through the base, respectively. For the HP-Foil-PCM and HP-Foam-PCM configurations, a vertical orientation achieved a slightly higher liquid fraction by approximately 0.03 and 0.05, respectively, relative to horizontal orientation. This may be attributed to the flow of the HP's internal working fluid, in which gravity assists the return of the liquid working fluid to the HP evaporator in a vertical orientation. The time for complete melting and solidification for the HP-Foil-PCM configuration was reduced to 11 % and 3 % of that for a non-enhanced system, respectively, regardless of orientation.Overall, the combination of a HP with foils or foam may achieve much higher melting and solidification rates with respect to a non-enhanced system.

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Section: Introductionmentioning

confidence: 99%

Effect of inclination angle during melting and solidification of a phase change material using a combined heat pipe-metal foam or foil configuration

Allen

Sharifi

Faghri

et al. 2015

International Journal of Heat and Mass Transfer

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show abstract

“…The variations are mainly because of the inclination angle of the heat sink. Few studies have addressed the inclinationdependent melting behaviors (Webb and Viskanta, 1986;Ye et al, 2012;Kamkari et al, 2014) and the resulting performance of PCM-based heat sinks (Kandasamy et al, 2007;Wang et al, 2007;Yang and Wang, 2012). Among these studies, however, Kandasamy et al (2007) and seem to be the only ones who have presented experimental efforts where these three inclination angles being examined were horizontal (0), inclined at 45 to horizontal, and vertical (90).…”

Section: Introductionmentioning

confidence: 99%

Effect of the inclination angle on the transient performance of a phase change material-based heat sink under pulsed heat loads

Jiang

Fan

Zeng

et al. 2014

J. Zhejiang Univ. Sci. A

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The transient performance of a phase change material (PCM)-based heat sink may be affected by its inclination angle because natural convection usually occurs and dominates melting during the operation of the heat sink. An experimental setup was designed and used in this study that allows for the alternation of the inclination angle of the heat sink. The inclination angle was varied from 0° to 90° at increments of 15°, while two pulsed heat loads (20 and 40 W) were adopted. 1-hexadecanol of a nominal melting temperature of 49 C was selected as the PCM. The transient performance of the heat sink was characterized by the temperature variations at the center of the heat spreader under various conditions. The results showed that the transient performance of the heat sink is able to be improved by simply increasing its inclination angle which then facilitates the natural convection during melting. However, the variation in the performance is not a monotonous function of the inclination angle. Although the time-averaged thermal resistances of the heat sink were shown to be only marginally lowered, the maximum operation times may be greatly extended under the given thermal conditions. For a heat load of 40 W and the maximum allowable temperature of 75 °C, the operation time of the heat sink is extended by up to nearly 67% at an inclination angle of 75° when compared to that of the horizontal case. Based on the cases tested, the optimal inclination angle was found to lie between 60° and 75°.

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Effect of the length ratio on thermal energy storage in wedge-shaped enclosures

Gao

et al. 2014

J Therm Anal Calorim

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Effect of the inclination angles on thermal energy storage in a quadrantal cavity

Cited by 25 publications

References 20 publications

Effect of inclination angle during melting and solidification of a phase change material using a combined heat pipe-metal foam or foil configuration

Effect of inclination angle during melting and solidification of a phase change material using a combined heat pipe-metal foam or foil configuration

Effect of the inclination angle on the transient performance of a phase change material-based heat sink under pulsed heat loads

Effect of the length ratio on thermal energy storage in wedge-shaped enclosures

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