External Coefficient of Heat Transfer by Convection in Mixed Vessels Using Vertical Tube Baffles

Rosa, Vitor da Silva; Pinto, Thiago César de Souza; Santos, Aldo Ramos; Moino, Carlos Alberto Amaral; Tamião, Karina; Lia, Luiz Renato Bastos; Tambourgi, Elias Basile; Lopes, Marcilio Dias; Toneli, Juliana Tófano de Campos Leite; Júnior, Deovaldo de Mores

doi:10.1021/ie301841q

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…The principles of the heat transfer process in agitated vessels and basic correlations which enable calculation of the heat transfer coefficient for different physical systems agitated in vessels of different geometrical configurations have been discussed in monographs ,, and papers. , Over the last 25 years the development of research in this field concerned mainly such problems as mathematical modeling of the mean , and local heat transfer coefficients; optimization of the agitated vessel geometry for heat transfer process; ,,,,,,,, measurements of the mean heat transfer coefficient for viscous ,,,,, and non-Newtonian fluids, ,,, immiscible liquid mixtures, and nanosuspensions; measurements of local heat transfer coefficient for liquid ,, and gas–liquid systems; ,,,,, testing of different types of the heating/cooling heat transfer surfaces in agitated vessels, i.e. jackets, ,,,, helical coils, ,,, vertical tubular coils; ,, CFD modeling of heat transfer process in agitated vessels. ,,,, …”

Section: Introductionmentioning

confidence: 99%

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Local Heat Transfer Process for a Gas–Liquid System in a Wall Region of an Agitated Vessel Equipped with the System of CD6-RT Impellers

Bielka

Cudak

Karcz

2014

Ind. Eng. Chem. Res.

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The results of the experimental studies of local heat process for a gas–liquid system in the region of the cylindrical wall of an agitated vessel equipped with the system of CD 6–RT impellers are presented. A lower CD 6 impeller (Smith turbine) and upper RT impeller (Rushton turbine) were located on the common shaft in a baffled agitated vessel of inner diameter equal to 0.3 m. Liquid height in the agitated vessel was equal to 0.6 m. Newtonian liquids of different physical properties were used as a continuous phase. Air was dispersed in the liquid. Local heat transfer coefficients were measured using both thermal and electrochemical methods. In total, 2280 experimental points were obtained. Distributions of the heat transfer coefficients were described by means of eqs 12–17 and 18–23 as a function of the Re and Pr numbers, dimensionless axial coordinate z/H, and modified Fr g number, separately, for turbulent and transitional ranges of the fluid flow in the agitated vessel. Equations 12–17 and 18–23, concerning both coalescing and noncoalescing gas–liquid systems, have no equivalent in the open literature.

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Section: Introductionmentioning

confidence: 99%

“…measurements of the mean heat transfer coefficient for viscous ,,,,, and non-Newtonian fluids, ,,, immiscible liquid mixtures, and nanosuspensions;…”

Section: Introductionmentioning

confidence: 99%

Local Heat Transfer Process for a Gas–Liquid System in a Wall Region of an Agitated Vessel Equipped with the System of CD6-RT Impellers

Bielka

Cudak

Karcz

2014

Ind. Eng. Chem. Res.

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“…Heat exchangers are chemical and biochemical reactors and in tanks with mechanical impellers are the jackets, the helical coils, the spiral coils and the vertical tube baffles [22]. The vertical tube baffles in addition to exchanging heat with the stirring fluid avoid the formation of vortices that can be harmful to the quality efficiency of the mixture [23].…”

Section: Heat Transfer 41 Calculation Of the Thermal Exchange Areamentioning

confidence: 99%

Review Heat Transfer of Non-Newtonian Fluids in Agitated Tanks

Rosa¹,

Júnior²

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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The heating and cooling of non-Newtonian liquids in tanks with mechanical impellers are operations commonly employed as chemical reactors, heat exchangers, distillers, extractors, thinners and decanters. In particular, the design of heat exchangers (jackets, helical coils, spiral coils and vertical tubular baffles) in tanks requires the prior knowledge of the rheology of the liquid for the calculation of the convection coefficients and the Reynolds number, in order to obtain the area thermal exchange. This chapter aimed to present the basic concepts of tanks with agitation, non-Newtonian liquids, hydrodynamics, heat transfer and, finally, with a practical design example for engineers and undergraduate students.

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“…The measurements were carried out for the standard agitated vessel with Rushton turbine, but the results were not described mathematically. Heat transfer process in the agitated vessel equipped with vertical tubular coil was experimentally studied by Karcz and Major (2001a, b) for non-Newtonian liquid, as well as by Rosa et al (2013, 2017) for Newtonian liquid.…”

Section: Introductionmentioning

confidence: 99%

An effect of the tubular baffles configuration in an agitated vessel with a high-speed impeller on the power consumption

Major-Godlewska

Karcz

2018

Chem. Pap.

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The results of the power consumption for an agitated vessel equipped with vertical tubular baffles and high-speed impeller are presented in the paper. Aqueous solutions of CMC were agitated within transitional range of the non-Newtonian liquid flow in the agitated vessel of inner diameter equal to 0.6 m. Eight different types of the impellers were tested: Rushton or Smith turbines, turbine with straight blades, pitched blade turbines and propeller. The J tubular baffles of outer diameter B were located in the position e from the vessel wall. Different configurations of baffles, arranged around the vessel circumference singularly or blocked in the modules, were considered in the study. In total, 180 different tubular baffles–impeller systems were tested. The measurements of the torque were conducted by means of the strain gauges method. Based on the power characteristics obtained for each impeller type, the effect of the geometrical parameters of the vertical tubular baffles on the power number was determined and discussed. The results show that geometry of the tubular baffles mostly affects the power number for the system with radial flow Rushton turbine. Moreover, power numbers decrease with the increase of the clearance between baffle and vessel wall for the systems, in which the radially axial circulation of the liquid is promoted. The dependences of the power number on the geometrical parameters of the vertical tubular baffles arranged singularly around the vessel circumference were described by means of the Eqs. (5)–(16). These equations can be useful in the project computations.

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External Coefficient of Heat Transfer by Convection in Mixed Vessels Using Vertical Tube Baffles

Cited by 8 publications

References 10 publications

Local Heat Transfer Process for a Gas–Liquid System in a Wall Region of an Agitated Vessel Equipped with the System of CD6-RT Impellers

Local Heat Transfer Process for a Gas–Liquid System in a Wall Region of an Agitated Vessel Equipped with the System of CD6-RT Impellers

Review Heat Transfer of Non-Newtonian Fluids in Agitated Tanks

An effect of the tubular baffles configuration in an agitated vessel with a high-speed impeller on the power consumption

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