Numerical Investigation of Cross-Connected Alternating Converging-Diverging Channels

Kanargi, Omer Bugra; Law, Matthew; Yap, Cheng‐Hon; Lee, Poh Seng

doi:10.1016/j.egypro.2015.07.687

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Nevertheless, despite the lack of sufficient knowledge about thermo-fluid physics in LA-PFHSs, their overall thermal performances should be identified in order to determine the capability of LA-PFHSs as the potentially efficient thermal management solutions compared with SFHSs. This is performed using correlations provided by Eqs (14), (15), and (16). To calculate η , first, R HS,SFHS is correlated from the raw experimental data as a function of pumping power, then this function is applied to compute the equivalent R HS,SFHS at the pumping power associated with each LA-PFHS.…”

Section: Resultsmentioning

confidence: 99%

“…Since the boundary layer acts as a stationary insulating layer, interrupting the boundary layer in order to avoid its growth over the surface potentially improves the thermal characteristics of the air-cooled system. There are different techniques to interrupt the boundary layer, including wavy fins [3,4], louvered fins [5,6], offset strip fins [7,8], vortex generators [9,10], grooved channels [11,12], pin fins [13,14], converging-diverging channels [15,16], and perforated fins. However, since perforated fins result in lighter devices because of perforations, they are particularly attractive in weight sensitive applications.…”

Section: Introductionmentioning

confidence: 99%

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Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Shaeri

Bonner

2017

Applied Thermal Engineering

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Thermal and hydraulic performance of laterally perforated-finned heat sinks (LA-PFHSs) operating in the laminar flow regime were experimentally investigated and compared to that of the solid-finned heat sink (SFHS). Square cross sectional perforations at three different sizes were distributed equidistantly along the length of the LA-PFHSs. For each perforation size, five different porosities were tested. Locally measured thermal resistances at various locations along the heat sink were acquired. The results signify the key roles of geometrical parameters, mainly the fin pitches, on thermal-fluid characteristics of LA-PFHSs. The effects of both perforation size and porosity on overall pressure drops were also measured and presented. LA-PFHSs increased the pressure drops due to cavities formed over the perforations. The pressure drag was found to be the dominant pressure drop when compared with friction drag. However, the pressure drops became independent of the porosity beyond a threshold perforation size. Overall, LA-PFHSs are promising thermal management solutions to decrease thermal resistance and improve temperature uniformity across the heat sink base at a given pumping power, if the optimum range of porosity is obtained for a given perforation size. The results indicate that weight sensitive applications would be the most promising use for LA-PFHS. A new parameter as the mass-based thermal resistance was defined, and for the cases studied in this paper, over 45% reduction in the mass-based thermal resistance of the SFHS was achieved using LA-PFHSs with the maximum porosity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Shaeri

Bonner

2017

Applied Thermal Engineering

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“…Kanargi vd. [20] düz ve açılı (30° ve 45°) ısı dağıtıcının termo hidrolik performansını sayısal olarak analiz ederek deneysel doğrulamasını icra etmişleridir. 30°'lik kanatlara sahip ısı dağıtıcı daha güçlü ikincil hava akış hızlarıyla 45°'lik modele göre daha iyi performans göstermiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Plaka Kanatlı Isı Dağıtıcı Termal Performansının Deneysel Olarak Zorlanmış Konveksiyonda İncelenmesi

ÇORUMLU,

ABUŞKA

2023

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Bu çalışmada, plaka kanatlara (PID) sahip ısı dağıtıcının karşılaştırmalı olarak kanatsız düz ısı dağıtıcı (DID) ile termal performansı 30 ℃ ortam sıcaklığında, 33-66-99 W ısıl güçlerinde ve 2000-16000 Reynolds sayısı aralıklarında deneysel olarak incelenmiştir. Güç ortalaması dikkate alınarak plaka model düze göre yüzey sıcaklıklarında 57 ℃ ve eklem sıcaklıklarında 30.5 ℃’lik avantaj sağlamıştır. Nu sayısında plakalı model düze göre güçler için sırasıyla %79, %35 ve %38 daha yüksek olup buradan bariz olarak 33 W’ta oldukça iyi bir ısı transfer performansı sergilemiştir. Termal dirençte plakalı model düze göre güçler için sırasıyla 0.61, 0.50 ve 0.39 K/W daha düşük değerlere sahip olup güç artışıyla azalan bir eğilim göstermiştir. Plakalı modelin basınç kaybı düze göre güçler için sırasıyla 0.88, 0.75 ve 1.13 Pa yüksek gerçekleşmiştir. Basınç kaybındaki bu küçük farkların, plakalı modelin akışa paralel kanatlara sahip olmasının payı büyüktür. THP’de ise plakalı model düze göre güçler için sırasıyla %40, %10 ve %10 avantaj sağlamış ve özellikle 33 W için bariz yüksek bir performans sergilemiştir. Güç artışıyla THP’deki plakalı modelin avantajı azalmıştır.

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Numerical Investigation of Cross-Connected Alternating Converging-Diverging Channels

Cited by 2 publications

References 5 publications

Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Laminar forced convection heat transfer from laterally perforated-finned heat sinks

Plaka Kanatlı Isı Dağıtıcı Termal Performansının Deneysel Olarak Zorlanmış Konveksiyonda İncelenmesi

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