Experimental Investigation of Natural Convection From Porous Blocks in a Cavity

Doğan, Ayla; Ozbalci, Oguzhan; Atmaca, İbrahim

doi:10.1615/jpormedia.v19.i12.10

Cited by 3 publications

(4 citation statements)

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“…During the experiments, it was seen that experimental conditions achieve a steady-state condition after about 3-5 h. After reaching the steady condition, differences in temperatures between two intervals became negligible (T< 0.1 0C) and all measured temperature values were recorded. The test procedure and measurements are similar to the experimental method that Dogan et al [12]. Q conv is the amount of heat transferred by convection from foam heat sinks to air and calculated as follows:…”

Section: Methodsmentioning

confidence: 99%

“…Dogan et al [12] experimentally conducted natural convection from aluminum foam blocks placed in a volume. The aluminum foams having different pore densities (10, 20 and 40 PPI) were used in experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Flow and heat transfer properties were analyzed according to Rayleigh number (Ra), aspect ratio (A) and Prandtl number (Pr). Dogan et al [12] experimentally conducted natural convection from aluminum foam blocks placed in a volume. The aluminum foams having different pore densities (10, 20 and 40 PPI) were used in experiments.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel

Doğan¹,

Ozbalci²

2018

Cumhuriyet Science Journal

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In this present study, free convection from an in-line 5x1 array of aluminum foam heat sinks which were placed on the bottom wall of the inclined rectangular channel was investigated. Aluminum foam heat sinks were made of Al-6101 alloy. All heat sinks mounted on a bottom wall of the channel was discrete form and exposed to uniform heat flux. Aluminum foam materials with three different pore densities (10, 20 and 40 PPI) were used in experiments. Air was used as coolant fluid (Pr =0.7). The experiments were made for Rayleigh Number range from 2.03 x10 7 to 1.33 x10 8 and the channel inclination angles were varied from 0° to 90°. Moreover, the heat transfer results from the aluminum foam heat sinks were also compared to the results obtained for foam-free (without foam) surfaces. The results showed that both the channel inclination angle and the usage of foam heat sinks are significant influences on heat transfer results.Özet. Bu çalışmada, eğimli dikdörtgen bir kanalda, 5x1diziliminde alüminyumdan yapılmış köpük ısı alıcılarından doğal taşınımla ısı transferi incelenmiştir. Alüminyum köpük ısı alıcılar Al-6101 alaşımında yapılmıştır. Kanalın alt duvarına monte edilen bütün ısı alıcılar ayrık formda yerleştirilmiş ve sabit ısı akısına maruz bırakılmıştır. Deneylerde farklı gözenek yoğunluğuna sahip (10, 20 ve 40 PPI) metal köpük malzemeler kullanılmıştır. Soğutma akışkanı olarak hava (Pr =0.7) kullanılmıştır. Deneyler Rayleigh sayısının 2.03 x10 7 ila 1.33 x10 8 arasındaki değerleri ve kanal eğim açısı 0° ila 90° arasında değişen değerleri için yapılmıştır. Ayrıca, alüminyum köpük ısı alıcılardan elde edilen ısı transferi sonuçları düz yüzeyler (köpük olmayan) için elde edilen sonuçlarla karşılaştırılmıştır. Elde edilen sonuçlar, hem kanal eğim açısının ve hem de köpük ısı alıcıların kullanılmasının, ısı transfer sonuçları üzerinde önemli etkileri olduğunu göstermiştir.Anahtar Kelimeler: Serbest taşınım, köpük ısı alıcı, elektronik soğutma, eğimli kanal.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel

Doğan¹,

Ozbalci²

2018

Cumhuriyet Science Journal

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“…The effect of 10 PPI, 20 PPI and 40 PPI aluminum metal foam heat sinks placed in a 3 × 3 arrangement in a partially open cavity on natural and forced convection heat transfer was experimentally investigated [16,17]. In both studies, the most heated elements were determined, and solutions were offered for the appropriate cooling process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Thermal and Pressure Performance of Porous Heat Sink Subjected to Al2O3-H2O Nanofluid

Ozbalci

Doğan²,

Asiltürk³

2022

Electronics

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With the developing technology, the dimensions of electronic systems are becoming smaller, and their performance and the amount of energy they need increases. This situation causes the electronic components to heat up more and the existing cooling systems to become inadequate. In this study, instead of the fins used in existing systems, 10 PPI and 40 PPI PHS were placed inside a water block, and the Al2O3-H2O nanofluid at a mass fraction of 0.1% was used as the cooling fluid. Experiments were carried out under constant heat flux of 454.54 W/m2 and 1818.18 W/m2, with volumetric flow rates varying between 100 mL/min and 800 mL/min. The heat transfer results were compared with the results obtained from the base fluid and the empty surface. The results showed that the nanofluid reduced the surface temperatures compared to the base fluid. Especially when PHSs were used together with the nanofluid, a significant increase in heat transfer occurred compared to the empty surface. The highest heat transfer was observed when both the nanofluid and 40 PPI PHS were used together. In addition, the highest thermal performance value was determined as 1.25 times compared to the empty surface when the nanofluid and 10 PPI PHS were used together.

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Performance of discretely mounted metal foam heat sinks in a channel with nanofluid

Ozbalci

Doğan

Asiltürk

2023

Applied Thermal Engineering

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Experimental Investigation of Natural Convection From Porous Blocks in a Cavity

Cited by 3 publications

References 0 publications

Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel

Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel

Experimental Study of Thermal and Pressure Performance of Porous Heat Sink Subjected to Al2O3-H2O Nanofluid

Performance of discretely mounted metal foam heat sinks in a channel with nanofluid

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