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Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime

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2022
Authors
Brzić, Danica
Pešić, Radojica
Arsenijević, Zorana
Đuriš, Mihal
Bošković-Vragolović, Nevenka
Kaluđerović-Radoičić, Tatjana
article (publishedVersion)
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Abstract
The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat t...ransfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.

Keywords:
heat transfer / turbulent flow regime / Geldart D particles
Source:
Particulate Science and Technology, 2022
Publisher:
  • Taylor & Francis Online
Funding / projects:
  • info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172022/RS// (RS-172022)
  • info:eu-repo/grantAgreement/MESTD/inst-2020/200026/RS// (RS-200026)

DOI: https://doi.org/10.1080/02726351.2022.2053015

ISSN: 0272-6351

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URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5052
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  • Radovi istraživača / Researchers’ publications (TMF)
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Tehnološko-metalurški fakultet

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