An experimental investigation on heat transfer performance of pulsating heat pipe

Shang, Fang; Fan, Shilong; Yang, Qingjing; Liu, Jianhong

doi:10.1007/s12206-019-1241-x

Cited by 15 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar studies have been also performed for HP photovoltaic/thermal systems, which shows the HP performance is sensitive to the inclination angle, especially for wickless HPs [24]. Furthermore, the orientation effect on pulsating HPs has been also studied in [25,26], and the results point out that pulsating HPs with lower thermal resistance enable a more uniform heat distribution under gravity-assisted operation. However, the impact of HP inclination angle on motor temperature distribution is still unclear and requires an intensive investigation.…”

Section: Figmentioning

confidence: 57%

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Figmentioning

confidence: 57%

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.

View full text Add to dashboard Cite

show abstract

“…The temperature between adjacent channels on both sides is gradually decreasing from top to bottom. The flow mode of the working fluid is the same as that of single-row PHP with a lateral inclination of 90° [29]. This means that when the side inclination angle is 90°, the temperature oscillation mode of the double-row PHP on both sides is different at the time due to the random distribution of working fluid after start-up.…”

Section: Operation Characteristics At Different Inclination Anglesmentioning

confidence: 95%

Study on heat transfer characteristics of single-layer double-row pulsating heat pipe

et al. 2022

Self Cite

View full text Add to dashboard Cite

The structure and inclination angle of a pulsating heat pipe are critical factors influencing the heat transfer performance and operation mode. In this work, a single-layer double-row pulsating heat pipe is designed, and the start-up and heat transfer characteristics of pulsating heat pipe at limit angles (0?,90?, and 180?) are experimentally investigated. Also, the operation mode and heat transfer characteristics are studied through IR imager and temperature profiles. The study highlighted that the pulsating heat pipe has excellent operation characteristics in the limit angle. When the inclination angle is 0?, the double-row structure improves the start-up performance; at 90? inclination, the pulsating heat pipe starts the fastest, and the heat transfer resistance keeps the smallest in the whole test. When the inclination angle is 180?, the pulsating heat pipe has the best thermal sensitivity but weak working fluid flow capacity during operation.

show abstract

“…The experimental results showed that the working-fluid-filling ratio has a greater influence on the optimal heat transfer performance, and the greater the heating power, the higher the optimal volume-filling ratio. Shang et al [19] experimentally tested the heat transfer performance of pulsating heat pipes at different inclination angles using thermocouples and an infrared camera. The results showed that when gravity inhibits the flow of working fluid, although the temperature distribution is uniform, the thermal resistance increases.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Operating Characteristics of Flat-Plate CLPHP for PEMFC Cooling

Li¹,

Chang²,

Zhao³

2021

WEVJ

View full text Add to dashboard Cite

Proton exchange membrane fuel cell (PEMFC) generates electricity through hydrogen and oxygen chemical reaction with the generation of much heat. According to the working temperature of PEMFC, the thermal resistance and internal relative pressure change of the flat-plate micro closed-loop pulsating heat pipe (CLPHP) are tested and analyzed at different filling ratios, vacuum degrees, and inclination angles, whose working medium is binary methanol-deionized water with a mass ratio of 5:1. The experiment results show that the higher the vacuum degree is, the better the startup and heat transfer performance of CLPHP become; the thermal resistance is less sensitive to inclination angle except for horizontal placement; the 40% volume-filling ratio can effectively avoid dry-out at high temperature. When 80 °C is the ideal working temperature of PEMFC, the thermal resistance of CLPHP is 0.093°C/W; the heat transfer heat flux is 1.59 W/cm2, and the temperature fluctuation is small. Therefore, flat-plate CLPHP has great application potential for PEMFC cooling.

show abstract

An experimental investigation on heat transfer performance of pulsating heat pipe

Cited by 15 publications

References 21 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

Study on heat transfer characteristics of single-layer double-row pulsating heat pipe

Experimental Investigation on the Operating Characteristics of Flat-Plate CLPHP for PEMFC Cooling

Contact Info

Product

Resources

About