Experimental investigation of heat transfer between a fluidized bed and a cylindrical surface

Berg, B. V.; Baskakov, A. P.

doi:10.1007/bf00829925

“…There have been many studies of heat transfer to immersed surfaces in fluidized beds, from workers such as Berg and Baskakov (1966), Botterill and Desai (1972) and Grewal and Saxena (1980). The bulk of these however, were intended for the power generation industry and the correlations that were developed are only applicable to large diameter tubes, such as the boiler tubes used in power generation.…”

Section: Discussionmentioning

confidence: 99%

“…Masoumifard et al (2008) constructed a more complex model, that is capable of predicting the heat transfer rates over a wider range of applications, but it is highly dependent on the cluster and immersed surface contact time, τ , which will change as soon as the immersed surface undergoes any sort of motion. Berg and Baskakov (1966) showed this dependence on movement of the immersed surface clearly, even though their study looked at rotating motion, not horizontal. From these previous studies it can be seen that when there is motion of the immersed surface, there will be some influence on heat transfer rates.…”

Section: Literature Reviewmentioning

confidence: 96%

“…This section will detail the contributions made by previous workers that have shaped the field into what it is today. Berg and Baskakov (1966) conducted one of the earliest studies of small diameter cylinders in a gas fluidized bed. Their work focused on vertical immersed cylinders of 3, 6, 10, 19.7 and 19.8 mm rotating about their axis.…”

Section: Literature Reviewmentioning

confidence: 99%

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Heat transfer to a moving wire immersed in a gas fluidized bed furnace

Tannas¹

2023

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In order to replace hazardous molten lead baths in the heat treatment of carbon steel wire with environmentally friendly fluidized bed furnaces a better understanding is needed of their heat transfer rates. There has been considerable work done in examining heat transfer rates to large cylinders immersed in fluidized beds, and some on wire sized ones as well, but all previous studies have been conducted on static cylinders. In order to gain a deeper understanding of heat transfer rates to a moving wire immersed in a fluidized bed furnace an apparatus has been constructed to move a wire through a fluidized bed. The heat transfer rates were calculated using the difference in inlet and outlet temperatures, wire speed and the bed temperature. As predicted, correlations for static wire were found to under-predict heat transfer rates at higher wire speeds, so a new correlation was developed by modifying an existing one.

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“…Masoumifard et al (2008) constructed a more complex model, that is capable of predicting the heat transfer rates over a wider range of applications, but it is highly dependent on the cluster and immersed surface contact time, τ , which will change as soon as the immersed surface undergoes any sort of motion. Berg and Baskakov (1966) showed this dependence on movement of the immersed surface clearly, even though their study looked at rotating motion, not horizontal. From these previous studies it can be seen that when there is motion of the immersed surface, there will be some influence on heat transfer rates.…”

Section: Literature Reviewmentioning

confidence: 96%

“…This section will detail the contributions made by previous workers that have shaped the field into what it is today. Berg and Baskakov (1966) conducted one of the earliest studies of small diameter cylinders in a gas fluidized bed. Their work focused on vertical immersed cylinders of 3, 6, 10, 19.7 and 19.8 mm rotating about their axis.…”

Section: Literature Reviewmentioning

confidence: 99%

Heat transfer to a moving wire immersed in a gas fluidized bed furnace

Tannas¹

2023

Preprint

0

View full text Add to dashboard Cite

In order to replace hazardous molten lead baths in the heat treatment of carbon steel wire with environmentally friendly fluidized bed furnaces a better understanding is needed of their heat transfer rates. There has been considerable work done in examining heat transfer rates to large cylinders immersed in fluidized beds, and some on wire sized ones as well, but all previous studies have been conducted on static cylinders. In order to gain a deeper understanding of heat transfer rates to a moving wire immersed in a fluidized bed furnace an apparatus has been constructed to move a wire through a fluidized bed. The heat transfer rates were calculated using the difference in inlet and outlet temperatures, wire speed and the bed temperature. As predicted, correlations for static wire were found to under-predict heat transfer rates at higher wire speeds, so a new correlation was developed by modifying an existing one.

show abstract