Experimental investigation of various turbulator inserts in gas-heated channels |
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Authors: | Dmitri Neshumayev Arvo Ots Jaan Laid Toomas Tiikma |
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Institution: | Thermal Engineering Department, Tallinn University of Technology, Kopli 116, 11712, Tallinn, Estonia |
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Abstract: | This experimental research was focused on the investigation of the heat transfer augmentation by various turbulator inserts in gas-heated channels. The work was conducted directly in a convective part of a two fire-tube boiler. The flue ducts were positioned vertically and horizontally for various design applications. Twisted-tape insert (with the twist ratio y=4.12), the straight-tape insert, and the combined turbulator insert (the internal twisted tape with the twist ratio of 180° y=2.16 and an external tape, which spirally winded on an internal tape, with longitudinal pitch H360°=110 mm and the relative height of a tape (rib) e/D0=0.098;0.2) were investigated. The working fluids were the combustion products of light oil fuel and wood pellets. In addition, the experiments were conducted in the two fire-tube boiler without any inserts. Despite of relatively large data scattering obtained in these experiments some qualitative and quantitative conclusions were drawn. |
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Keywords: | Heat transfer augmentation Twisted and straight tapes Combined turbulator |
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