Development and tests of loop heat pipe with multi-layer metal foams as wick structure

Zhou, Wei; Ling, Weisong; Duan, Lian; Hui, K.S.; Hui, Kwun Nam

doi:10.1016/j.applthermaleng.2015.10.085

Cited by 58 publications

(13 citation statements)

References 34 publications

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“…A previous study proposed the use of multi-layer metal foams and composite porous copper fiber sintered sheets as wick structures for LHPs. Improved heat transfer performance was observed for the LHPs with different heat loads [21][22].…”

Section: Introductionmentioning

confidence: 95%

Thermal performance of loop heat pipes with smooth and rough porous copper fiber sintered sheets

Ling

Zhou

et al. 2017

Energy Conversion and Management

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Smooth and rough porous copper fiber sintered sheets, employed here as wicks for loop heat pipes for the first time, were fabricated using a low-temperature solid-phase sintering method. The capillary performance of these porous copper fiber sintered sheets were analyzed and discussed. The influence of the surface morphology, filling ratio, and working fluid on the thermal resistance, evaporator wall temperature, and start-up time of the loop heat pipes were investigated. The results showed that the capillary pumping amount of working fluid for both smooth and rough porous copper fiber sintered sheets initially increases rapidly, and then gradually attains a stable state. The curve of the capillary pumping amount of working fluid can be described as a function that increases exponentially over time. When rough porous copper fiber sintered sheets are used as wicks and deionized water is used as the working fluid, the capillary pumping amount is maximized. Compared to smooth porous copper fiber sintered sheets, loop heat pipes with rough porous copper fiber sintered sheets exhibit a shorter start-up time, lower thermal resistance, and lower evaporator wall temperature. For a filling ratio in the range of 15–45%, loop heat pipes with rough porous copper fiber sintered sheets and a 30% filling ratio show lower thermal resistance and a lower evaporator wall temperature. Ultimately, the use of deionized water as the working fluid with a 30% filling ratio enables loop heat pipes with rough porous copper fiber sintered sheets to be stably operated at a heat load of 200 W

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Section: Introductionmentioning

confidence: 95%

Thermal performance of loop heat pipes with smooth and rough porous copper fiber sintered sheets

Ling

Zhou

et al. 2017

Energy Conversion and Management

Self Cite

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“…At present, the research on LHP mainly focuses on the porous wick structure of LHP [12], , the cryogenic LHP [13], the operating characteristics of multi-evaporator LHP [14,15], the instability of LHP [14,16], and so on. Wolf and Bienert [17] discovered that LHP has temperature hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis phenomena in flat-type loop heat pipe

et al. 2021

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Testing of loop heat pipes (LHPs) showed that the heat-load dependence of the operating temperature was not always unambiguous. It may have hysteresis phenomena. The temperature hysteresis had a certain relationship with previous history of the power variation, and also related to the initial parameters of the LHP. It has been found that the temperature hysteresis of the LHP was related to the gas-liquid distribution in the compensation chamber (CC) which depended on the interaction between heat leak of evaporator and the reflux liquid from condenser. The temperature of the LHP evaporator rose with the gas phase in the compensation chamber increased.

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“…The data showed that the sintered porous wick has a faster start up speed, more stable operation, and lower thermal resistance than metal wire mesh porous wick. Zhou et al [6] fabricated a multilayer foam metal wick evaporator. Experiments showed that multilayer foam copper has higher thermal conductivity and a smaller effective aperture than foam nickel, shorter start up time, and a lower thermal resistance during operation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Loop Heat Pipe with Direct Pouring Porous Wick for Cooling Electronics

Cheng

Deng

et al. 2021

Processes

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A pouring silicate wick was manufactured to explore the influence of process and physical properties on the production and performance of loop heat pipes (LHP). This paper theoretically analyzed the advantages of pouring porous wick and introduced the technology of pouring silicate directly on evaporator. Based on this, the heat transfer performance of copper-methanol LHP system with pouring porous wick was tested under different positions. The results showed that with the input of multiple heat sources, the LHP could start up and maintain a stable temperature from 40 W to 160 W. When the vapor grooves were located above the compensation chamber, it was difficult to start up positively. By adding gravity assistance, the system could obtain more stable liquid supply and vapor flow, so as to realize start up. In the variable heat load test, the LHP showed good adaptability to the change of heat load. The thermal resistance of the system decreased with the increase of heat load. The thermal resistance of the evaporator almost unchanged and was always lower than 0.05 °C/W, which indicated that the pouring porous wick in the evaporator had good heat load matching.

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Development and tests of loop heat pipe with multi-layer metal foams as wick structure

Cited by 58 publications

References 34 publications

Thermal performance of loop heat pipes with smooth and rough porous copper fiber sintered sheets

Thermal performance of loop heat pipes with smooth and rough porous copper fiber sintered sheets

Hysteresis phenomena in flat-type loop heat pipe

Experimental Study of a Loop Heat Pipe with Direct Pouring Porous Wick for Cooling Electronics

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