Experimental investigation of the effect of inclination angle on the performance of phase change material based finned heat sink

Kothari, Ravi; Sahu, Santosh Kumar; Kundalwal, S. I.; Sahoo, SK

doi:10.1016/j.est.2021.102462

Cited by 51 publications

(6 citation statements)

References 50 publications

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“…By the capillary force generated in the wick structure, the working medium is driven from the evaporator section back to the condenser section, which could provide a very high value of equivalent thermal conductivity of up to 100000 W/mꞏK considering its lightweight and small size, thereby making it a competitive cooling device for electrical machines [9]. Due to the gravitational effect on the backflow of the working medium, the inclination angle has a significant impact on HP thermal performance, which has been confirmed by the studies in the fields of thermology and mechanical engineering [11][12][13][14][15][16]. If we define the inclination angle θ as the angle between the backflow direction and the gravity direction of the working medium, the gravitational effect on the backflow of the internal working medium in the HP can be divided into the gravity-assisted case (θ＜90 °) and gravity-opposed case (θ ＞90 °), as shown in Fig.…”

Section: Introductionmentioning

confidence: 87%

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

Zhao,

Zhang,

et al. 2023

IEEE Trans. on Ind. Applicat.

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Due to high equivalent thermal conductivity with lightweight and small size, heat pipes (HPs) are being extensively applied in the motor cooling system to improve its thermal performance. However, when practically installed in electrical machines, the inclination angle of the HP will affect its thermal conductivity and motor temperature distribution as well, which is still unclear. This article intends to figure out the effects of HP inclination angle on motor temperature distribution via both theoretical and experimental investigation. Based on the theoretical analysis of the HP inclination effect, the equivalent thermal conductivity of the HP with different inclination angles from 0 ° to 180 ° is experimentally investigated on a dedicated platform. Then, temperature distribution across a full-size statorwinding assembly with HPs is quantitatively studied using an established thermal model. Finally, the thermal simulation results are experimentally verified by testing on a processed specimen. The results indicate that the HP thermal performance degrades by over 80% with the inclination angle from 0 ° to 180 °, which results in a significant temperature nonuniformity across the motor under liquid cooling conditions.

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Section: Introductionmentioning

confidence: 87%

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

Zhao,

Zhang,

et al. 2023

IEEE Trans. on Ind. Applicat.

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“…The PCM melting performance and accordingly the efficient energy storage process of PCM are affected by many parameters. One of these parameters is the inclination angle of the enclosure where the PCM is located (Abdulmunem et al , 2020; Bouzennada et al , 2021; Kothari et al , 2021). Because the transient melting process of a PCM is strongly affected by its inclination angle caused by the behaviour of natural convection (Korti and Guellil, 2020).…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the effects of inclination angle and container material on thermal energy storage by phase change material in a thick-walled disc

Kiyak,

Oztop,

Aksoy

2024

HFF

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Purpose The purpose of this study is to examine the effects of inclination angle on the thermal energy storage capability of a phase change material (PCM) within a disc-shaped container. Different container materials are also tested such as plexiglass and aluminium. This study aims to assess the energy storage capacity, melting behaviour and temperature distributions of PCM with a specific melting range (22°C–26°C) for various governing parameters such as inclination angles, aspect ratios (AR) and temperature differences (ΔT) and compare the melting behaviour and energy storage performance of PCM in aluminium containers to those in plexiglass containers. Design/methodology/approach A finite volume approach was adopted to evaluate the thermal energy storage capability of PCMs. Five inclination angles ranging from 0° to 180° were considered and the energy storage capacity. Also, the melting behaviour of the PCM and temperature distributions of the container with different materials were tested. Two different AR and ΔT values were chosen as parameters to analyse for their effects on the melting performance of the PCM. Conjugate heat transfer problem is solved to see the effects of conduction mode of heat transfer. Findings The results of the study indicate that as AR decreases, the effect of the inclination angles on the energy storage capacity of the PCM decreases. For lower ΔT, the difference between the maximum and minimum stored energies was 20.88% for AR = 0.20, whereas it was 6.85% for AR = 0.15. Furthermore, under the same conditions, the PCM stored 8.02% more energy in plexiglass containers than in aluminium containers. Originality/value This study contributes to the understanding of the influence of inclination angle, container material, AR and ΔT on the thermal energy storage capabilities of PCM in a novel designed container. The findings highlight the importance of AR in mitigating the effect of the inclination angle on energy storage capacity. Additionally, comparing aluminium and plexiglass containers provides insights into the effect of container material on the melting behaviour and energy storage properties of PCM.

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“…Experimental and numerical studies on phase-change heat transfer for different placement angles of heat exchangers have been studied by many researchers. Kothari et al (Kothari et al, 2021,) studied the effect of inclined angle on the thermal performance of four types of rectangular-finned phaseconverter heat exchangers through experiments. It is found that the inclined angle of the heat exchanger has a major effect on the thermal characteristics of the heat exchanger without fins, but the effect was less significant for the finned heat exchanger, especially the three-fin heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Characteristics of an Inclined Shell-and-Tube Phase-Change Thermal Energy Storage Unit

Zhang

Wang

et al. 2022

Front. Energy Res.

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Detailed experimental investigation is presented for the heat transfer characteristics of an inclined shell-and-tube phase-change thermal energy storage unit. For the case of inclined angle α = π/4, the solid–liquid interface presented a concave surface because the heat transfer can be affected not only by conduction in the phase-change material (PCM) domain but also by natural convection significantly. The heat transfer rate increases with the increasing flow rate and inlet temperature of heat transfer fluid (HTF), but the flow rate of the HTF has little effect on the charging process for the case of qv ≥ 40 L/h. The heat transfer rate of PCM above the HTF tube increases with the increase of inclined angle. The effects of inclined angle on the heat transfer rate can be not negligible due to the obvious natural convection in the charging process.

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Experimental investigation of the effect of inclination angle on the performance of phase change material based finned heat sink

Cited by 51 publications

References 50 publications

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

A numerical study on the effects of inclination angle and container material on thermal energy storage by phase change material in a thick-walled disc

Experimental Study on the Heat Transfer Characteristics of an Inclined Shell-and-Tube Phase-Change Thermal Energy Storage Unit

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