Flower Shaped Oscillating Heat Pipe at the thermosyphon condition: Performance at different rotational speeds, filling ratios, and heat supplies

Czajkowski, Cezary; Nowak, Andrzej I.; Ochman, Agnieszka; Pietrowicz, Sławomir

doi:10.1016/j.applthermaleng.2022.118540

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…Other errors associated with the experiments are summarized in Table 5. The error analysis results presented are the same as in Czajkowski et al [18] since the same test apparatus was used.…”

Section: Data Accuracymentioning

confidence: 99%

“…The filling ratio and thermophysical properties of the medium, such as specific heat, enthalpy of vaporization, density, viscosity, surface tension, boiling point, etc. determine the performance and operating conditions of the device [18]. Experimental studies were carried out with the working fluid NOVEC™ 7000 (3M™) and Table 3 presents its thermophysical properties.…”

Section: Operation Conditionsmentioning

confidence: 99%

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A Preliminary Investigation on the Geometrical Shape of Pulsating Heat Pipe under Hyper-Gravity Conditions

Czajkowski¹,

Nowak²,

Kassai³

et al. 2023

JFFHMT

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Many industrial processes require the use of efficient heat-transport devices in challenging environments. One solution is the use of passive devices that utilize multiphase flows. The aerospace sector is one industry where devices operate in normal gravity, microgravity, and hyper-gravity conditions. The study demonstrates the use of two different pulsating heat pipe geometries subjected to normal and hypergravity conditions (acceleration from 1g to 8g). The working fluid used was HFE-7000 at volumetric filling ratios of 44% and 66%. The results showed that an appropriate geometrical adjustment improves the performance of the PHP under hypergravity conditions, as does a higher volumetric filling ratio.

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Section: Data Accuracymentioning

confidence: 99%

Section: Operation Conditionsmentioning

confidence: 99%

A Preliminary Investigation on the Geometrical Shape of Pulsating Heat Pipe under Hyper-Gravity Conditions

Czajkowski¹,

Nowak²,

Kassai³

et al. 2023

JFFHMT

View full text Add to dashboard Cite

show abstract

“…The minimum thermal resistance was 0.071 • C/W with 3528 W input power and a 90 • inclination angle. Czajkowski et al [50] studied the patterned OHP with a special rotation system. The thermal resistance was 0.05 • C/W when the rotation speed was higher than 200 rpm.…”

Section: Excellent Heat Transfer Performancementioning

confidence: 99%

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Xin

Jiang

et al. 2023

Aerospace

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A MCOHP (micro-channel oscillating heat pipe) can provide lightweight and efficient temperature control capabilities for aerospace spacecraft with a high power and small size. The research about the heat flow effects on the thermal performance of MCOHPs is both necessary and essential for aerospace heat dissipation. In this paper, the heat flow effects on the thermal performance of MCOHPs are summarized and studied. The flow thermal performance enhancement changes of MCOHPs are given, which are caused by the heat flow work fluids of nano-fluids, gases, single liquids, mixed liquids, surfactants, and self-humidifying fluids. The use of graphene nano-fluids as the heat flow work medium can reduce the thermal resistance by 83.6%, which can enhance the maximum thermal conductivity by 105%. The influences of gravity and flow characteristics are also discussed. The heat flow pattern changes with the work stage, which affects the flow mode and the heat and mass transfer efficiency of OHP. The effective thermal conductivity varies from 4.8 kW/(m·K) to 70 kW/(m·K) when different gases are selected as the working fluid in OHP. The study of heat flow effects on the thermal performance of MCOHPs is conducive to exploring in-depth aerospace applications.

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“…In a heat transfer test where the flux varied from 73.8 to 98.4 kW/m 2 and the rotation speed varied from 0 to 300 rpm, the flower-shaped AR-OHP resulted in an improvement in heat transfer. [38,39]. During dry grinding, the AR-OHP grinding wheel can successfully reduce high temperatures when grinding difficult-to-grind materials, reduce grinding wheel wear, and extend grinding wheel life [40,41].…”

Section: Introductionmentioning

confidence: 99%

Visualization Experiments of Radial-Rotating Oscillating Heat Pipe Filled with Methanol

Wang,

Qian,

2023

Glob. J. Energ. Technol. Res. Updat.

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Oscillating heat pipes (OHP) have highly efficient heat transfer capability. Some researchers have applied OHPs to cutting tools and rotating machines by embedding tubular OHPs in machines or by making flow channels on metal plates. Most studies are on heat transfer performance, and there are few studies on the heat transfer behavior of radial-rotating oscillating heat pipes (RR-OHP) under operating conditions. This paper conducted the visualization test of an RR-OHP filled with methanol by studying the flow patterns and motion modes at rotation speed (0-860 rpm) and heat flux (20000-40000 W/m2). When the heat flux is increased from 20000 W/m2 to 40000 W/m2, the flow patterns include flowless, slug flow, annular flow, and churn flow, and the motion modes contain oscillatory motion, cyclic motion, unilateral boiling, and bilateral boiling. The distribution map of the flow patterns and motion modes with the centrifugal acceleration and the heat flux was plotted, which shows the evolution of the flow patterns and the transformation of the motion modes of the RR-OHP, and elucidates the effect of the centrifugal acceleration and the heat flux on the flow patterns and motion modes.

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Flower Shaped Oscillating Heat Pipe at the thermosyphon condition: Performance at different rotational speeds, filling ratios, and heat supplies

Cited by 11 publications

References 42 publications

A Preliminary Investigation on the Geometrical Shape of Pulsating Heat Pipe under Hyper-Gravity Conditions

A Preliminary Investigation on the Geometrical Shape of Pulsating Heat Pipe under Hyper-Gravity Conditions

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Visualization Experiments of Radial-Rotating Oscillating Heat Pipe Filled with Methanol

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