Research Article
Year 2018,
, 756 - 765, 30.09.2018
Abstract
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 x107 ila 1.33 x108 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.
References
- [1]. Xu, Z. G., Qu, Z.G. and Zhao, C.Y., Experimental Study of Natural Convection in Horizontally-Positioned Open-Celled Metal Foams, Materials for Renewable Energy& Environment (ICMREE), International Conference, Shanghai.,(2011) 923-928.
- [2]. Hotta, T. K., and Venkateshan, S. P., Natural and Mixed Convection Heat Transfer Cooling of Discrete Heat Sources Placed Near the Bottom on a PCB, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering., vol.6, (2012) 1446-1453.
- [3]. Habib M. A., Said, S. A. M., and Ayinde T., Characteristics of Natural Convection Heat Transfer in an Array of Discrete Heat Sources, Experimental Heat Transfer, vol.27, (2014) 91–111.
- [4]. Durgam S., Venkateshan S.P., and Sundararajan T., Experimental and Numerical Investigations on Optimal Distribution of Heat Source Array Under Natural and Forced Convection in a Horizontal Channel, International Journal of Thermal Sciences, vol.115, (2017) 125-138.
- [5]. Buonomo B., Manca O., Nardini S., Diana A., Experimental and Numerical Investigation on Natural Convection in Horizontal Channels Partially Filled with Aluminum Foam and Heated from Below, Proceedings of the ASME 2016 Heat Transfer Summer Conference HT2016, Washington, DC, USA,(2016) 1-8.
- [6]. Qu Z., Wang T., Tao W., and Lu T., Experimental study of air natural convection on metallic foam-sintered plate, International Journal of Heat and Fluid Flow, vol:38, (2012) 126–132.
- [7]. Deng, Q.-H., Tang, G.-F., and Li, Y. Ha, M. Y., Interaction between discrete heat sources in horizontal natural convection enclosures, International Journal of Heat and Mass Transfer, 45-26, (2002), 5117-5132.
- [8]. Awasarmol, U. and Pise A. T., Experimental Study of Effect of Angle of Inclination of Fins on Natural Convection Heat Transfer through Permeable Fins, International Conference on Thermal Energy and Environment (2011) 1-6.
- [9]. Kiwan, S.,and Khodier, M., Natural Convection Heat Transfer in an Open-Ended Inclined Channel-Partially Filled with Porous Media, Heat Transfer Engineering, 29-1, (2008), 67–75.
- [10]. Oztop H. F., Natural convection in partially cooled and inclined porous rectangular enclosures, International Journal of Thermal Sciences, 46-2, (2007), 149–156.
- [11]. Saravanan,S., Nayaki Senthil, V. P. M.,and Kandaswamy, P., Natural Convection in a Rectangular Enclosure with an Array of Discrete Heat Sources, Heat Transfer Research,48-5,(2017) 391–399.
- [12]. Dogan, A., Ozbalci O., and Atmaca İ., Experimental Investigation of Natural convection from Porous Blocks in a Cavity, Journal of Porous Media, 19-12, (2016), 1023–1032.
- [13]. De Schampheleire, S., De Jaeger, P., Reynders, R., De Kerpel, K., Ameel, B., T’Joen, C., Huisseune, H., Lecompte, S., De Paepe, M., Experimental study of buoyancy-driven flow in open-cell aluminum foam heat sinks, Appl. Therm. Eng.,59-1-2,(2013), 30–40.
- [14]. Kim, S. Y., Paek, J. W., and Kang, B. H., Thermal performance of aluminum-foam heat sinks by forced air cooling, IEEE Trans. Components PackagingTechnol.,vol.26, (2003), 262–267.
- [15]. Holman, J. P., Analysis of Experimental Data, Experimental Methods for Engineers, 6th ed., McGraw-Hill, Inc, New York, (1994), 49-56.
Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel
Abstract
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
x107 to 1.33 x108 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.
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
x107 to 1.33 x108 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.
References
- [1]. Xu, Z. G., Qu, Z.G. and Zhao, C.Y., Experimental Study of Natural Convection in Horizontally-Positioned Open-Celled Metal Foams, Materials for Renewable Energy& Environment (ICMREE), International Conference, Shanghai.,(2011) 923-928.
- [2]. Hotta, T. K., and Venkateshan, S. P., Natural and Mixed Convection Heat Transfer Cooling of Discrete Heat Sources Placed Near the Bottom on a PCB, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering., vol.6, (2012) 1446-1453.
- [3]. Habib M. A., Said, S. A. M., and Ayinde T., Characteristics of Natural Convection Heat Transfer in an Array of Discrete Heat Sources, Experimental Heat Transfer, vol.27, (2014) 91–111.
- [4]. Durgam S., Venkateshan S.P., and Sundararajan T., Experimental and Numerical Investigations on Optimal Distribution of Heat Source Array Under Natural and Forced Convection in a Horizontal Channel, International Journal of Thermal Sciences, vol.115, (2017) 125-138.
- [5]. Buonomo B., Manca O., Nardini S., Diana A., Experimental and Numerical Investigation on Natural Convection in Horizontal Channels Partially Filled with Aluminum Foam and Heated from Below, Proceedings of the ASME 2016 Heat Transfer Summer Conference HT2016, Washington, DC, USA,(2016) 1-8.
- [6]. Qu Z., Wang T., Tao W., and Lu T., Experimental study of air natural convection on metallic foam-sintered plate, International Journal of Heat and Fluid Flow, vol:38, (2012) 126–132.
- [7]. Deng, Q.-H., Tang, G.-F., and Li, Y. Ha, M. Y., Interaction between discrete heat sources in horizontal natural convection enclosures, International Journal of Heat and Mass Transfer, 45-26, (2002), 5117-5132.
- [8]. Awasarmol, U. and Pise A. T., Experimental Study of Effect of Angle of Inclination of Fins on Natural Convection Heat Transfer through Permeable Fins, International Conference on Thermal Energy and Environment (2011) 1-6.
- [9]. Kiwan, S.,and Khodier, M., Natural Convection Heat Transfer in an Open-Ended Inclined Channel-Partially Filled with Porous Media, Heat Transfer Engineering, 29-1, (2008), 67–75.
- [10]. Oztop H. F., Natural convection in partially cooled and inclined porous rectangular enclosures, International Journal of Thermal Sciences, 46-2, (2007), 149–156.
- [11]. Saravanan,S., Nayaki Senthil, V. P. M.,and Kandaswamy, P., Natural Convection in a Rectangular Enclosure with an Array of Discrete Heat Sources, Heat Transfer Research,48-5,(2017) 391–399.
- [12]. Dogan, A., Ozbalci O., and Atmaca İ., Experimental Investigation of Natural convection from Porous Blocks in a Cavity, Journal of Porous Media, 19-12, (2016), 1023–1032.
- [13]. De Schampheleire, S., De Jaeger, P., Reynders, R., De Kerpel, K., Ameel, B., T’Joen, C., Huisseune, H., Lecompte, S., De Paepe, M., Experimental study of buoyancy-driven flow in open-cell aluminum foam heat sinks, Appl. Therm. Eng.,59-1-2,(2013), 30–40.
- [14]. Kim, S. Y., Paek, J. W., and Kang, B. H., Thermal performance of aluminum-foam heat sinks by forced air cooling, IEEE Trans. Components PackagingTechnol.,vol.26, (2003), 262–267.
- [15]. Holman, J. P., Analysis of Experimental Data, Experimental Methods for Engineers, 6th ed., McGraw-Hill, Inc, New York, (1994), 49-56.
There are 15 citations in total.
Details
| Primary Language | English |
|---|---|
| Journal Section | Engineering Sciences |
| Authors | |
| Publication Date | September 30, 2018 |
| Submission Date | April 26, 2018 |
| Acceptance Date | August 2, 2018 |
| Published in Issue | Year 2018 |