The local heat transfer at the wall of a large vessel agitated by turbine impellers

Akse, H.; Beek, W.J.; Berkel, F.C.A.A. van; Graauw, J. de

doi:10.1016/0009-2509(67)80006-x

Cited by 16 publications

(27 citation statements)

References 3 publications

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“…in the pipe and Reynolds number according to (5). The mean temperature of the liquid was maintained within a range of 20.5 ± 1.5…”

Section: Validation Of the Method: Impinging Jet Flowmentioning

confidence: 99%

“…4d) started at the distance approximately L = 80d from the inlet, therefore, we assumed a fully developed velocity profile there. The volumetric flow rate was measured by the induction flow meter (Krohne IFC010D) and it was used in the calculation of the mean velocity u in the pipe and consequently the Reynolds number according to (5). The experimental setup is in Figure 4.…”

Section: Validation Of the Methodmentioning

confidence: 99%

“…They also presented axial dependencies of local heat transfer coefficients in an air-water agitated system. The heat transfer in a jacketed vessel agitated by the standard Rushton turbine was described by Akse et al [5]. Edwards and Wilkinson [6] also presented a review of the heat transfer in agitated vessels with various types of agitators and heat transfer surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers can be found about heat transfer in the whole vessel (Wichterle [16], Mohan et al [17], Akse et al [5], Karcz [7]) but only a few deal with local heat transfer coefficients at the bottom of the agitated vessel or at the vessel wall (Karcz and Cudak [18], Engeskaug et al [19], Mohan et al [17] and Akse et al [5]). …”

Section: Introductionmentioning

confidence: 99%

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Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

et al. 2018

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Abstract. The Temperature Oscillation Infra-Red Thermography (TOIRT) was used to measure convective heat transfer coefficients at the inner vertical wall of an agitated and baffled vessel. Two impellers were used: an axial six-blade impeller with pitched blades and the Rushton turbine. The TOIRT method represents an indirect method based on measuring the phase shift between the oscillating heat flux applied to one side of the heat transfer surface and the wall temperature response monitored by a contactless infra-red camera at the same side. On the basis of this phase shift, the TOIRT method can indirectly evaluate the heat transfer coefficient on the other side of the heat transfer surface. Two forms of experimental results are presented in this paper. The first one describes graphical dependencies of the local Nusselt number on the dimensionless distance from the vessel bottom for various Reynolds numbers. The second form describes the mean Nusselt number along the wall as a function of the Reynolds number.

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“…in the pipe and Reynolds number according to (5). The mean temperature of the liquid was maintained within a range of 20.5 ± 1.5…”

Section: Validation Of the Method: Impinging Jet Flowmentioning

confidence: 99%

Section: Validation Of the Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

et al. 2018

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“…The use of the empirical correlations is restricted because they depend on the process from which they were obtained. Other studies in jacketed stirred tanks have focused on evaluating the influence of baffles and the impeller type and size on the heat transfer coefficient using different working fluids.…”

Section: Introductionmentioning

confidence: 99%

Nusselt number correlation for a jacketed stirred tank using computational fluid dynamics

et al. 2018

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The heat exchange in stirred tanks occurs mainly due to the impeller rotation and overall circulation of the fluid that promotes a more effective heat transfer between fluid and heat transfer surfaces. The type of impeller used and the size of the vessel (that affects the relation heat transfer area and volume of the vessel) have significant effects on the heat transfer. The heat transfer coefficient is very much dependent on the impeller and the speed of rotation. Empirical correlations are usually used to estimate the process side heat transfer coefficient. However, its dependence on the geometrical parameters restricts the use of those correlations to specific tank configurations. In this respect, the use of computational fluid dynamics (CFD) has recently emerged as an alternative to experimental studies. The procedure proved to be faster and lower cost, and the results proved to be accurate. In this study, CFD was applied to obtain a Nusselt number correlation for a jacketed stirred tank equipped with a six‐blade Rushton turbine impeller. The Nusselt number correlation obtained from the simulated model agrees with experimental data providing a reliable representation of the heat transfer in the tank.

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Transport phenomena under unsteady conditions in an agitated vessel

Rajan

Picot

1970

Can J Chem Eng

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An experimental study of transport phenomena at the wall of an agitated vessel with a propeller impeller under unsteady conditions is reported. The transient in heat transfer at the wall is caused by a step change in the speed of agitation from an initial static condition. The results are expressed in terms of a rise in modified "j-factor" above the initial free convection value and the number of revolutions taken by the impeller from the start of agitation. Abo, an attempt has been made to find an analogy beween heat and momentum transfer. Results are given for the power in terms of Euler number plotted against the impeller Reynolds number. An empirical expression is also given for the transient heat transfer considering the system as a pure first order one with time delay. A "timefactor" constant which gives the number of impeller revolutions for 63.270 of the ehange from the initial to a final steady state is expressed as a function of impeller Reynolds nsmber (10

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The local heat transfer at the wall of a large vessel agitated by turbine impellers

Cited by 16 publications

References 3 publications

Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

Nusselt number correlation for a jacketed stirred tank using computational fluid dynamics

Transport phenomena under unsteady conditions in an agitated vessel

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