Application of biporous wick in flat-plate loop heat pipe with long heat transfer distance

Zhang, Zikang; Zhao, Runze; Liu, Zhichun; Liu, Wei

doi:10.1016/j.applthermaleng.2020.116283

Cited by 41 publications

(12 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, the flow circulation is several orders lower than that of traditional TOEC or membrane distillation devices, and the flow can be driven by the thermo-osmosis effect if the noncondensable gas has been removed from the closed cycle. 20…”

Section: Introductionmentioning

confidence: 99%

“…The system recycles heat energy through a multistage architecture to improve its total thermal efficiency, and each stage will work at a lower temperature difference, so even a low working pressure can obtain a high efficiency. Besides, the flow circulation is several orders lower than that of traditional TOEC or membrane distillation devices, and the flow can be driven by the thermo-osmosis effect if the noncondensable gas has been removed from the closed cycle …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stack Thermo-Osmotic System for Low-Grade Thermal Energy Conversion

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Thermo-osmotic energy conversion (TOEC) technology, developed from membrane distillation, is an emerging method that has the potential of obtaining electricity efficiently from a low-grade heat source but faces the difficult problem of pump power loss. In this study, we build a novel TOEC system with a multistage architecture that can work without pump assistance. The experiment system, made of cheap commercial materials, can obtain a power density of 1.39 ± 0.25 W/m 2 , with a heating temperature of 80 °C, and its efficiency increased linearly with the total stage number. A theory calculation shows that a 30-stage system with a specific membrane and a working pressure of 5.0 MPa can obtain an efficiency of 2.72% with a power density of 14.0 W/m 2 . By a molecular dynamics simulation, it is shown that a high-performance membrane has the potential to work at 40 MPa. This study proves that TOEC technology is a practical and competitive approach to covert low-grade thermal energy into power efficiently.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stack Thermo-Osmotic System for Low-Grade Thermal Energy Conversion

Zhang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…A typical wicking medium currently used in heat pipes for cooling electronics is a porous material (mesh or sintered powder), performance of which degrades at high heat fluxes because of insufficient liquid transport and large thickness of the wicking medium (>0.5 mm) that limit the heat transfer [ 30 , 31 , 32 ]. Hierarchical wicking materials based on the surface capillary effect offer significantly enhanced cooling performance due to a high velocity of liquid transport, small thickness (<100 µm), and efficient evaporative functionality [ 33 , 34 , 35 , 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

Fang

Zhang

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

A superwicking Ti-6Al-4V alloy material with a hierarchical capillary surface structure was fabricated using femtosecond laser. The basic capillary surface structure is an array of micropillars/microholes. For enhancing its capillary action, the surface of the micropillars/microholes is additionally structured by regular fine microgrooves using a technique of laser-induced periodic surface structures (LIPSS), providing an extremely strong capillary action in a temperature range between 23 °C and 80 °C. Due to strong capillary action, a water drop quickly spreads in the wicking surface structure and forms a thin film over a large surface area, resulting in fast evaporation. The maximum water flow velocity after the acceleration stage is found to be 225–250 mm/s. In contrast to other metallic materials with surface capillarity produced by laser processing, the wicking performance of which quickly degrades with time, the wicking functionality of the material created here is long-lasting. Strong and long-lasting wicking properties make the created material suitable for a large variety of practical applications based on liquid-vapor phase change. Potential significant energy savings in air-conditioning and cooling data centers due to application of the material created here can contribute to mitigation of global warming.

show abstract

“…However, both the cost and the dimension error requirement of the above two methods are high, especially for the sintered porous wick [4]. At present, the porous wicks widely used in LHPs are mainly fabricated by metal wire mesh [5], foam metal [6], sintered metal powder [7], and so on. Deng et al [8] used metal wire mesh to make porous wicks in LHP evaporators with a heat dissipation area of 190 mm × 90 mm.…”

Section: Introductionmentioning

confidence: 99%

“…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. Zhang et al [7] manufactured a biporous wick with nickel powder and constructed a flat-plate LHP with long heat transfer distance to test the performance limit of the biporous wick. The experimental results showed that the maximum heat load was 110 W (6.6 W/cm 2 ) and the minimum thermal resistance of the LHP was 0.382 • C/W.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Application of biporous wick in flat-plate loop heat pipe with long heat transfer distance

Cited by 41 publications

References 38 publications

Stack Thermo-Osmotic System for Low-Grade Thermal Energy Conversion

Stack Thermo-Osmotic System for Low-Grade Thermal Energy Conversion

Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

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

Contact Info

Product

Resources

About