Effect of Fluidized Bed Particle Size on Heat Transfer Coefficient at Different Operating Conditions
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The aim of this study is to investigate the effect of gas flow velocity, size of sand particles, and the distance between tubes immersed in a fluidized bed on heat transfer coefficient. Experimental tests were conducted on a bundle of copper tubes of (12.5 mm) diameter and (320 mm) length arranged in a matrix (17×9) and immersed in a fluidized bed inside a plastic container. One of the tubes was used as a hot tube with a capacity of (122 W). (25 kg) of sand with three different diameters of sand particles (0.15, 0.3 and 0.6 mm) was used in these tests at ten speeds for gas flow (from 0.16 m/s to 0.516 m/s). The results showed a significant inverse effect of fluidized bed particles diameter on the heat transfer coefficient. Accordingly, the heat transfer coefficient for (0.15mm) diameter sand was found to be higher than that of (0.3 mm) and (0.6 mm) sand by about (3.124) and (6.868) times respectively, in all tests. The results showed good agreement with results from other studies conducted under the same conditions but with different sand particle size.
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References
Van Ommen JO, Ellis N. JMBC/OSPT course particle technology. 2010.
Basu P. Combustion and gasification in fluidized beds. CRC press; 2006. DOI: https://doi.org/10.1201/9781420005158
Wu R, Lim C, Grace J, Brereton C. Instantaneous local heat transfer and hydrodynamics in a circulating fluidized bed. International journal of heat and mass transfer 1991; 34 (8): 2019-2027. DOI: https://doi.org/10.1016/0017-9310(91)90213-X
Masoumifard N., Mostoufi N, Hamidi A-A, Sotudeh-Gharebagh R. Investigation of heat transfer between a horizontal tube and gas–solid fluidized bed. International Journal of Heat and Fluid Flow, 2008; 29 (5):1504-1511. DOI: https://doi.org/10.1016/j.ijheatfluidflow.2008.06.004
Stefanova A, Bi H, Lim C, Grace J. Heat transfer from immersed vertical tube in a fluidized bed of group A particles near the transition to the turbulent fluidization flow regime. International Journal of Heat and Mass Transfer 2008; 51 (7-8): 2020-2028. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2007.06.005
Habeeb L, Al-Turaihi R. Simulation and experiment study of gas-solid flow behavior in the standpipe of a fluidized bed. International Conference on Engineering and Information Technology. September 2012: pp. 17-19.
Yassir Makkawi, "Particle to gas heat transfer in a circulating fluidized bed riser.10th International Conference on Circulating Fluidized Beds and Fluidization Technology-CFB-10. T. Knowlton, PSRI Eds, ECI Symposium Series, (2013).
Chourasia S, Alappat BJ. Experimental study on the attrition and size distribution of bed material in a recirculating fluidized bed. Chemical Engineering Communications 2017; 204: 1174-1186. DOI: https://doi.org/10.1080/00986445.2017.1353498
Holman JP. Heat transfer. 10th ed., New York; The McGraw Hill Companies: 2010.
Moawed MA, Berbish NS, Allam AA, El-Shamy AR, M. El-Shazly K. Heat transfer between fluidized bed and horizontal bundle of tubes in a vertical channel. International Journal of Chemical Reactor Engineering 2010; 8 :1-28. DOI: https://doi.org/10.2202/1542-6580.2123
Al-Mola YS. Experimental investigation of heat transfer from finned tube bundle immersed in shallow gas fluidized bed. MSc. Thesis: Mosul University; Mosul, Iraq: 2008
Tahseen. TA. Optimal geometric arrangement of unfinned and finned flat tube heat exchanger under laminer forced convection. PhD Thesis: Universiti Malaysia Pahang; Pahang, Malasyia: 2014.
Al-Dabbagh MS. The influence of air distributor on heat transfer coefficient in fluidized bed of heat pipe heat exchanger. Al-Taqani Journal 2005; 19 (2): 135-149.