Heat Transfer at the Bottom of a Cylindrical Vessel Impinged by a Swirling Flow from an Impeller in a Draft Tube

Petera, Karel

doi:10.15255/cabeq.2016.1057

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…In general, such similarities can be found only in regions where the flow is aligned with the vessel wall. Such regions are larger in configurations with an impeller placed in a draft tube [25], or in cases with axial-flow impellers and larger H/D ratio.…”

Section: Mmentioning

confidence: 99%

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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Section: Mmentioning

confidence: 99%

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

et al. 2018

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“…Many empirical correlations were presented for power consumption (Nagata, 1975;Stręk, 1981), heat transfer (Kuncewicz, 2012;Stręk, 1981) and mass transfer (Harnby et al, 1997), as well as for multiphase systems (Kamieński, 2004;Tatterson, 1991). Recently, experimental studies have been developed on momentum transfer (Cudak et al, 2016), power consumption (Major-Godlewska and Karcz, 2018), heat transfer (Petera et al, 2017;Rosa et al, 2020), multi-phase system production (Cudak, 2016, Cudak et al, 2019Kiełbus-Rąpała et al, 2019), gas hold-up (Busciglio et al, 2017;Cudak, 2020;Lee and Dudukovic, 2014) and mass transfer (Kracik et al, 2020;Petricek et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Chemical and Process Engineering

Karcz,

Szoplik,

Major-Godlewska

et al. 2021

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In memory of Professor Jerzy BałdygaEfficiency of agitation was considered for different physical systems on the basis of our own experimental studies on homogenisation, heat and mass transfer as well as gas hold-up. Measurements were performed for different physical systems: Newtonian liquids of low and higher viscosity, pseudoplastic liquid, gas-liquid and gas-solid-liquid systems agitated in vessels of the working volume from 0.02 m 3 to 0.2 m 3 . Agitated vessels of different design were equipped with a high-speed impeller (10 impellers were tested). Comparative analysis of the experimental results proved that energy inputs (power consumption) should be taken into account as a very important factor when agitation efficiency is evaluated in order to select a proper type of equipment. When this factor is neglected in the analysis, intensification of the process can be estimated only.

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“…The stronger the mass transfer of the ions, the higher are the measured values of the current [5]. This method for measuring local values of the heat transfer coefficient was used, for example, by Petera et al [6] in the measurement of the local heat transfer coefficients at the bottom of the agitated vessel on which the jet of water was falling. The impinging jet was formed by an agitator that was placed in the draft tube.…”

Section: Introductionmentioning

confidence: 99%

Heat Flux Jump Method as a Possibility of Contactless Measurement of Local Heat Transfer Coefficients

Solnař

Dostál

2019

Acta Polytech

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This article deals with the derivation of the temperature response of the finite thickness wall, which is heated by heat flow, as a possibility to measure the local values of the heat transfer coefficient with a very high spatial resolution. In addition to its own experimental measurement technique, it is also possible to use this derivation to describe the gradual heating of the wall while using the temperature oscillation (TOIRT) method for the heat transfer measurement. The system of the partial differential equations and the boundary and initial conditions is solved by a transformation into Laplace’s space, where the task is easier to solve. At the end of the article, the results of the analytical solution are compared with a numerical solution of this problem.

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Heat Transfer at the Bottom of a Cylindrical Vessel Impinged by a Swirling Flow from an Impeller in a Draft Tube

Cited by 6 publications

References 13 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

Chemical and Process Engineering

Heat Flux Jump Method as a Possibility of Contactless Measurement of Local Heat Transfer Coefficients

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