Natural convection from perforated vertical fins with different hole diameters

Year 2018, Volume: 5 Issue: 4, 174 - 180, 31.12.2018

Mohammed Salam Taha Taha Ali Ateş Aziz Hakan Altun Eyüb Canlı

https://doi.org/10.31593/ijeat.505116

Abstract

Natural convection is a physical mechanism that is mostly benefited in cooling of electronics. Due to the variety of the geometrical and operational parameters, industrial and scientific studies are continuing for better performance. One of the focuses is on perforations of heat sink fins as a passive flow control technique. This work experimentally investigates a sinusoidal wavy fin heat sink after fins were perforated with two different hole diameters. Heat sink was heated by using an electrical resistance for six different heating powers. The temperature at the heater-heat sink interface was measured with the aid of four thermocouples. Transient and steady temperature values were measured and then recorded by means of a data-logger. The details of the experimental setup are given alongside of visuals. It is desired to state some assessment and evaluations about the experimental setup. Related literature studies are also summarized in the introduction section. Heat transfer, Rayleigh and Nusselt numbers were calculated and compared with each other and parameters by means of 2D plot graphics. The time for reaching steady state is changing between 1.5 to 2 hours. Average wall temperature changes linearly with heating power. Average wall temperature values are between 300 and 350 Kelvin. Nusselt number decreases with increasing Rayleigh number. While Rayleigh number changes between 500,000 to 2,000,000, Nusselt number decreases from 425 to 250. It is concluded that increasing perforation hole diameter slightly increases convection heat transfer. Some remarks for the future work is given in conclusion section.

An Erratum to this article was published on 31 December 2020 https://dergipark.org.tr/en/pub/ijeat/issue/57873/850296 

Keywords

Heat sink, Heat transfer, Natural convection, Perforated fin, Sinusoidal wavy fin

References

• Harahap F., McManus Jr.-H.N., 1967, “Natural convection heat transfer from horizontal rectangular fin arrays”, J. Heat Transfer, 89(1), 32–38.
• Liang, C.Y., Yang, W.J., 1975, "Heat transfer and friction loss performance of perforated heat exchanger surfaces", Journal of Heat Transfer, 97(1), 9-15.
• Patankar, S.V., and Prakash., C., 1981, "An analysis of the effect of plate thickness on laminar flow and heat transfer in interrupted plate passage", International Journal of Heat and Mass Transfer, 24(11), 1801-1810.
• Jasim, R.R., Ibrahim, T.K., Mhamuad, A.M., 2008, “Determination of the temperature distribution the perforated fins under natural convection”, Tikrit Journal of Engineering Sciences, 15(2), 62-77.
• Shaeri, M.R., Yaghoubi, M., Jafarpur, K., 2009, “Heat transfer analysis of lateral perforated fin heat sinks”, Applied Energy, 86(10), 2019-2029.
• Masao, F., Yu, S., Goro, Y., 1988, “Heat transfer and pressure drop of perforated surface heat exchanger with passage enlargement and contraction” International Journal of Heat and Mass Transfer, 31(1), 135-142.
• Kumbhar, D.G., Sane, D.N., Chavan, S.T., 2009, “Finite element analysis and experimental study of convective heat transfer augmentation from horizontal rectangular fin by triangular perforations” In Proc. of the International conference on Advances in Mechanical Engineering, 376-380.
• Qiu, Y., Tian, M., Guo, Z., 2013, “Natural convection and radiation heat transfer of an externally-finned tube vertically placed in a chamber”, Heat and Mass Transfer, 49(3), 405-412.
• AlEssa, A.H., Al-Odat, M.Q., 2009, “Enhancement of natural convection heat transfer from a fin by triangular perforations of bases parallel and toward its base”, The Arbian Journal for Science and Engineering, 34(2).
• Kim, D. K., 2012, “Thermal optimization of plate-fin heat sinks with fins of variable thickness under natural convection”, International Journal of Heat and Mass Transfer, 55(4), 752-761.
• Altun, A.H., Ziylan, O., 2018, “Düz plakali yüzeylerde dalgali kanatçiklarin doğal taşinimla isi transferi etkilerinin deneysel incelenmesi (Experimental investigation of heat transfer effects with natural convection of wavy fins on flat plate surfaces)”, International Green Capitals Congress, 940-948, 8-11 May 2018, Konya, Turkey. (in Turkish with English abstract)