Abstract
Heat transfer and friction factor characteristics in a circular tube fitted with core rod and honeycomb network inserts at high temperature have been investigated experimentally. In the experiments, ambient air with Reynolds numbers ranging from 6000 to 20,000 is passed through a circular tube with uniform wall temperature. Convection and radiation heat transfer phenomena are studied. The experimental results show that at uniform wall temperatures of 373, 473, 553, and 633 K, the average shares of the radiation heat transfer coefficient to the total heat transfer coefficient are 13.9%, 18.3%, 24.7%, and 28.7% for core rod and 11.5%, 13.1%, 15.3%, and 17.8% for honeycomb network insert, respectively. In addition, the heat transfer coefficient increased by 227%, 299%, 327%, and 369% for core rod and 409%, 529%, 614%, and 679% for honeycomb network insert compared with the plain tube under the aforementioned temperatures.
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Recommended by Associate Editor Ji Hwan Jeong
M. R. Alijani is currently a Ph.D student of Energy Engineering in the Science and Research Branch of Islamic Azad University, Tehran, Iran. Mr. Alijani’s research interests include radiation and heat transfer in tube and heat transfer enhancement techniques.
Ali A. Hamidi is a Professor at the Chemical Engineering Department of Tehran University, Iran. He received his Ph.D from Department of Chemical Engineering and Fuel Technology of Sheffield University, England in 1986. Ever since returning to Iran he has been working at Tehran University teaching heat transfer and combustion and fuel related courses. His main research interests are heat transfer phenomena and enhancement, heat exchangers design and performance and recently the application of nanofluids in cooling systems. He has co-authored over seventy papers published in national and international journals and conferences and is also very active in translating and writing books (in Persian) on chemical engineering subjects specially on heat transfer.
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Alijani, M.R., Hamidi, A.A. Convection and radiation heat transfer in a tube with core rod and honeycomb network inserts at high temperature. J Mech Sci Technol 27, 3487–3493 (2013). https://doi.org/10.1007/s12206-013-0874-4
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DOI: https://doi.org/10.1007/s12206-013-0874-4