The effect of Dixon rings on direct contact heat transfer performance: Comparison of counter and co-current evaporation

Jin, Yanchao; Hu, Runzhi; Cui, Yong; Liu, Yun; Huang, Qunwu

doi:10.1016/j.applthermaleng.2017.02.054

Cited by 14 publications

(8 citation statements)

References 39 publications

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“…Luo et al [8] designed a new type of helical tube reactor and applied it to the experimental study of liquid-liquid dispersion. Jin et al [9] applied Dixon rings in DCHT and found that the Dixon rings can have a positive effect through a series of experiments, and the heat transfer coefficient has almost doubled or even more. Li et al [10] studied the falling film evaporation heat transfer of R134a-entrained 0.5% to 5.1% POE-type lubricating oil on the horizontal pipe.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Enhanced Heat Transfer and Flow Characteristics in Direct-Contact Heat Exchanger: A Novel Kenics Static Mixer

Zhao

Zhang

Wang

et al. 2023

International Journal of Energy Research

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In this paper, a novel Kenics static mixer applied in a direct-contact heat exchanger (DCHE) was proposed in order to enhance the heat transfer efficiency. The computational fluid dynamics (CFD) simulation method was adopted to investigate the effect of the continuous phase and dispersed phase on direct-contact heat transfer (DCHT) in the Kenics static mixer. The perforation index (PI) was introduced to depict the performance of the Kenics static mixer, and the effect of different numbers of openings at three initial heat transfer temperature differences (at the inlet of the continuous and dispersed phases) was studied. The simulation results showed that under the same working conditions, a larger initial temperature difference would result in greater differences in the fluid uniformity index (UI), turbulence intensity, and time evolution of a gaseous working substance. The increase of hole numbers and decrease of hole diameters can optimize the DCHT. Under three initial temperature differences, the heat transfer efficiency for the 6-hole and 9-hole Kenics DCHEs was about 20% higher than the Kenics DCHE without holes.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Enhanced Heat Transfer and Flow Characteristics in Direct-Contact Heat Exchanger: A Novel Kenics Static Mixer

Zhao

Zhang

Wang

et al. 2023

International Journal of Energy Research

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“…Interfacial physical processes play a key role in the transfer of energy from the continuous phase to the dispersed phase, thus being linked to the performance of a DCHE. It is a common practice to improve the DCHE performance through increasing the interfacial area, e.g., using a sparger to inject the dispersed phase (Baqir A. M., 2016), or using Dixon rings (Jiang, 2015) (Jin, 2017) to break bubbles. Surface tension, the physical parameter driving phase change and immiscibility, is expected to strongly influence overall performance of a DCHE.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

Delchini¹,

Rao²,

Ahmad³

et al. 2021

Preprint

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“…In this publication, azeotropic distillation, single-effect evaporation, co-current multiple-effect evaporation and counter-current multiple-effect evaporation were compared as possible processes for the recovery of diluted sulfuric acid. However, numbers of simulation based description of evaporation systems has been published recently [13][14][15][16], only one work included sulfuric acid recovery [17]. This further emphasizes the urgent need for improvements in modelling of spent acid regeneration via separation technologies.…”

Section: Introductionmentioning

confidence: 99%

Prospective Evaluation of Spent Sulfuric Acid Recovery by Process Simulation

Várnai¹,

Petri²,

Nagy³

2020

Period. Polytech. Chem. Eng.

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This study presents the steady-state simulation and optimization with regard to the recovery of spent sulfuric acid. Our purpose was to prove the utility of process simulation in terms of designing with special materials using energy-efficient methods. Process simulation is used in order to compare technological variants, analyze technological problems that occur as well as optimize the process. In this investigation three concentration processes are compared: azeotropic distillation and multiple-effect evaporation both in co-current and counter-current modes. The main aspects of the comparison are energy consumption and heat efficiency. Process simulation is an adequate tool for analyzing the thermal decomposition of sulfuric acid, the presence of sulfuric acid in the vapor fraction, and the costs of applying a third agent. Here, three models and a simulation-based prospective evaluation of energy consumption and the economy are presented. It is shown that the process of azeotropic distillation consumes an extremely large amount of thermal energy which seems to be more than that consumed by single-effect evaporation, while triple-effect evaporation in the counter-current mode was found to be the most thermally efficacious.

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The effect of Dixon rings on direct contact heat transfer performance: Comparison of counter and co-current evaporation

Cited by 14 publications

References 39 publications

Numerical Simulation on Enhanced Heat Transfer and Flow Characteristics in Direct-Contact Heat Exchanger: A Novel Kenics Static Mixer

Numerical Simulation on Enhanced Heat Transfer and Flow Characteristics in Direct-Contact Heat Exchanger: A Novel Kenics Static Mixer

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

Prospective Evaluation of Spent Sulfuric Acid Recovery by Process Simulation

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