Heat Transfer Capacity of Lotus-Type Porous Copper Heat Sink

Chiba, Hiroshi; Ogushi, Tetsuro; Nakajima, Hideo; Ikeda, Teruyuki

doi:10.1299/jsmeb.47.516

Cited by 29 publications

(16 citation statements)

References 10 publications

(7 reference statements)

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“…Besides, the heat transfer capacity of the lotus-type porous copper heat sink was also investigated to be very high. 11) From the results, a lotus-type copper porous heat sink for air cooling is also expected to have high heat transfer capacity.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Capacity of Lotus-type Porous Copper Heat Sink for Air Cooling

Chiba

Ogushi

Nakajima

2010

JTST

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Lotus-type porous metal with many straight pores is attractive as a heat sink because larger heat transfer capacity is obtained due to the small diameter of the pores. The heat transfer capacity of the lotus-type porous copper heat sink was calculated using the model with the pores of uniform diameters. However, actual lotus-type porous metals have a distribution of pore diameter. In the present work, we investigated the lotus-type porous copper fin model (non-uniform pore model) by considering size distribution of measured on the actual measurement of the pore diameters on a cross-section of the lotus-type porous copper fin. Prediction of the heat transfer characteristics for the lotus-type porous copper heat sink shows a good agreement with the experimental data. In addition, the predicted heat transfer coefficient of non-uniform pore model also shows a good agreement with the uniform pore models. Thus, it is clarified that the heat transfer characteristic of the lotus-type porous copper heat sink can be predicted by the uniform pore model.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Capacity of Lotus-type Porous Copper Heat Sink for Air Cooling

Chiba

Ogushi

Nakajima

2010

JTST

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“…Copper is the most popular material for lotus-type structure with some beneficial properties like high thermal conductivity and high strength, which make it favorable and promising for filtration and thermal industry [7,8,19,24]. However, this metal has relatively lower hardness and is prone to adhesive and abrasive wear when used for filtration and separation purpose.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of lotus-type porous copper by aluminization

Cui

Wang

et al. 2018

SN Appl. Sci.

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This paper explores the feasibility to aluminize lotus-type porous copper to prolong the service life of lotus-type porous copper in applications. To achieve this goal, smaller particles of α-Al 2 O 3 , Al and NH 4 Cl were employed for aluminization process considering the difficulty arising from shielding effect by pore walls. The structure of the aluminized coating including thickness, elements profile and phase composition was characterized. It is found that the deposition of aluminized coating on pore walls of the lotus-type porous copper is feasible. It is indicated that the pore size has to be more than 300 µm in order to obtain a decent aluminized coating on pore walls of the lotus-type porous copper under the present experimental conditions. The coating is consisted of an alloy layer (first α-Cu, then a mixture of Cu 3 Al and Cu 9 Al 4 ) and a re-solidified layer (α-Al 2 O 3 particles incorporated in Al substrate). Furthermore, Vickers hardness, sliding property and wear resistance were evaluated. The hardness is enhanced by a factor of three, which is distributed from 105 to 302 HV 0.01 from copper substrate to the coating surface. It is also proved that the aluminized coating can significantly reduce the wear rate of the lotus-type porous copper by shifting the wear mechanism from adhesive mode to plowing mode by the improved hardness.

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“…The experimental data showed good agreement with the analytical results. Chiba et al [12][13][14] measured heat transfer coefficient and pressure drop of lotus-type copper porous heat sinks in which three fins were stacked in a row with constant fin spacing for air cooling and water cooling. However, only the heat transfer inside pores was discussed although the jets emerging from pores must exist in that configuration.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Pressure Drop of Lotus-Type Porous Metals

Muramatsu

Ide²,

Nakajima

et al. 2013

Journal of Heat Transfer

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Metal foams are of interest for heat transfer applications because of their high surfaceto-volume ratio and high convective heat transfer coefficients. However, conventional open-cell foams have high pressure drop and low net thermal conductivity in the direction normal to a heated surface due to the fully random structure. This paper examines heat transfer elements made by stacking thin layers of lotus metal which have many small pores aligned in the flow direction. The reduction in randomness reduces the pressure drop and increases the thermal conduction compared to conventional metal foams. Experimental results are presented for the heat transfer performance of two types of lotus metal flns, one with a deterministic pattern of machined holes and one with a random hole pattern made by a continuous casting technique. The layer spacing, the hole diameter, the porosity, and the flow Reynolds number were all varied. The measurements show that spacing between fin layers and the relative alignment of pores in successive fins can have a substantial effect on the heat transfer performance.

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Heat Transfer Capacity of Lotus-Type Porous Copper Heat Sink

Cited by 29 publications

References 10 publications

Heat Transfer Capacity of Lotus-type Porous Copper Heat Sink for Air Cooling

Heat Transfer Capacity of Lotus-type Porous Copper Heat Sink for Air Cooling

Surface modification of lotus-type porous copper by aluminization

Heat Transfer and Pressure Drop of Lotus-Type Porous Metals

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