Multiple effects of operating variables on heat transfer in three-phase slurry bubble columns

Shin, Ik Sang; Son, Sung Mo; Lím, D.; Kang, Yong; Jung, Heon; Lee, Ho Tae

doi:10.1007/s11814-010-0155-1

Cited by 4 publications

(2 citation statements)

References 18 publications

(28 reference statements)

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“…stainless steel tubing. Wall heat transfer coefficients in a bubble column can be measured by employing a heat source, and then measuring the energy input and temperature difference between the surface of the heat source and the column dispersion [11,16,17]. The heat transfer coefficient can be calculated from:…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Wall Heat Transfer Coefficient in a Molten Salt Bubble Column: Testing the Experimental Setup

Skosana¹,

Heydenrych

2014

AMR

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One of the advantages of bubble columns is high heat transfer rates. High heat transfer is important in reactors when high thermal duties are required. An appropriate measurement of heat transfer coefficient is of primary importance for designing reactors that are highly exothermic or endothermic. This paper presents the design and operation of experimental setup used for measurement of the heat transfer coefficient in molten salt media. The experimental setup was operated with tap water, heat transfer oil 32, LiCl–KCl eutectic and argon gas. Tap water was operated at the temperature of 40oC and heat transfer oil was operated at the temperature of 75oC, 103oC and 170oC. There were some challenges when operating the bubble column with molten salt due to leakages on the welds and aggressive corrosion on the column. All the experiments were run at superficial gas velocities of 0.01–0.05 m/s. Three heating tapes, each connected to a corresponding variable AC voltage controller, were used to heat the column media. Heat transfer coefficients were measured by inducing a known heat flux through the column wall and measurement of the temperature difference between the wall and the contents. In order to balance the system, heat was removed by the cooling water flowing through a copper tube on the inside of the column. Temperature differences between the column wall and the liquid were measured at five axial locations. It was found that the heat transfer coefficient increases with superficial gas velocity. The values of heat transfer coefficient for argon–water system were higher than those of argon–heat transfer oil system. Heat transfer coefficient was also found to increase with an increase in temperature.

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Section: Experimental Setup and Methodsmentioning

confidence: 99%

Wall Heat Transfer Coefficient in a Molten Salt Bubble Column: Testing the Experimental Setup

Skosana¹,

Heydenrych

2014

AMR

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“…The temperature-time signals, which were converted by voltage-time signals, were sampled at a rate of 500 Hz with a sampling time of 60 s and stored in the data acquisition system. The sample length comprised 30,000 data points, which were enough to detect the full spectrum of signals in the system (Shin et al, 2010;Cho et al, 2001aCho et al, , 2001b.…”

Section: Methodsmentioning

confidence: 99%

Heat transfer in three-phase (G/L/S) circulating fluidized beds with low surface tension media

Lím¹,

Jang²,

Jin³

et al. 2011

Chemical Engineering Science

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Effects of Liquid Surface Tension on the Heat Transfer Coefficient in a Three-Phase Slurry Bubble Column

Lim¹,

Lím²,

Jin³

et al. 2012

Korean Chemical Engineering Research

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Characteristics of overall heat transfer were investigated in a three-phase slurry bubble column with relatively low surface tension media, which has been frequently encountered in the fields of industry. The heat transfer phenomena was examined in the system which was composed of a coaxial vertical heater and a proper of bubble column. The heat transfer coefficient was estimated from the measured mean value of temperature difference between the heater surface and the column proper at the steady state condition. Effects of gas velocity (U G), solid fraction in the slurry phase (C S) and surface tension (σ L) of continuous liquid media on the overall heat transfer coefficient (h) in the bubble column were determined. The mean value of temperature difference was estimated from the data of temperature difference fluctuations with a variation of time. The amplitude and mean value of temperature difference fluctuations with respect to the elasped time appeared to decrease with decreasing the surface tension of liquid phase. The overall heat transfer coefficient between the immersed heated and the bubble column increased with an increase in the gas velocity or solid fraction in the slurry phase, but it decreased with an increase in the surface tension of continuous liquid media. The overall heat coefficient in the slurry bubble column with relatively low surface tension media was well correlated in term of operating variables and dimensionless groups within this experimental conditions.

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Multiple effects of operating variables on heat transfer in three-phase slurry bubble columns

Cited by 4 publications

References 18 publications

Wall Heat Transfer Coefficient in a Molten Salt Bubble Column: Testing the Experimental Setup

Wall Heat Transfer Coefficient in a Molten Salt Bubble Column: Testing the Experimental Setup

Heat transfer in three-phase (G/L/S) circulating fluidized beds with low surface tension media

Effects of Liquid Surface Tension on the Heat Transfer Coefficient in a Three-Phase Slurry Bubble Column

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