Assessment of Periodic Open Cellular Structures for Enhanced Heat Conduction in Catalytic Fixed‐Bed Reactors

Bianchi, Enrico; Schwieger, Wilhelm; Freund, Hannsjörg

doi:10.1002/adem.201500356

Cited by 57 publications

(37 citation statements)

References 23 publications

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“…Later, these structures were characterized with respect to their liquid holdup and the two‐phase pressure drop and thus their potential for process intensification . Similar to Busse et al 2016, Bianchi et al 2018 looked at the advantages of using POCS for increased and intensified heat transfer in fixed‐bed catalytic reactors , . The structures made of highly heat‐conductive materials can be used to enhance process safety and reaction control for exo‐ or endothermic reactions.…”

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucsupporting

confidence: 83%

“…In process engineering, the new capabilities of additive manufacturing have been already investigated in former studies. Especially, periodic open‐cell structures (POCS), which are a subtype class of additively manufactured lattice structures (AMLS) that in contrast can also be designed aperiodically or fractally, are the object of various research . In the following, a literature survey will be given, stating also the advantage of the used geometry design in this work considering past research in this field.…”

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

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SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

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In chemical process engineering, fast gas‐liquid reactions often suffer from an inefficient distribution of gas and therefore mixing and mass transfer performance. This study deals with the possibility of influencing the local gas holdup and bubble size distribution in a gas‐liquid process using additively manufactured lattice structures (AMLS). The used measuring technique to study bubble size, velocity, and the local gas holdup is a photo‐optical needle probe. By using AMLS, a significant radial homogenization of the local gas holdup and the mean bubble size is achieved. Furthermore, it can be demonstrated that the bubble size can be tailored by the geometry of the inserted structure. It is illustrated that the mean bubble velocities are lowered within the lattice resulting in a higher residence time of the dispersed phase with an impact on the mass transfer performance within the AMLS.

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Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucsupporting

confidence: 83%

Section: State‐of‐the‐art: Influence Of Additively Manufactured Strucmentioning

confidence: 99%

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

et al. 2020

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show abstract

“…Specifically in energy related applications, emissivity measurements are challenging. [104][105][106][107][108][109] Thermal conductivity based on phonon vibrations in dense materials is affected by grain size, grain boundaries, porosity, impurities, whiskers, and domain structures. The thermal conductivity is given in Equation 7.…”

Section: Thermal Characterizationmentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

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Reticulated ceramic foams are used in a wide range of applications such as filters, catalyst supports, lightweight materials, energy absorptions materials, or as scaffolds for tissue engineering as the most common ones. Based on gaseous foaming processes of polymers, a stochastic distribution of closed pores is obtained. By reticulation processing thin foam windows are removed between cells turning a closed cell into an open cell structure. These foams are used as template for porous ceramics manufacturing: With different processing approaches, for example, with dip coating of a ceramic slurry and a subsequent (multistep) thermal treatment ceramic reticulate foams are obtained. A variety of material properties strongly depend on the cell and strut size, as well on material composition. Functionalization of ceramic foam surfaces (outer surface functionalization), for example, with zeolites or nanosized aggregates lead to an increase of the specific surface area or provides catalytic or heat storage functionality. Filling of struts (inner surface functionalization) may lead to improved mechanical stability or may provide functionalities such as electric conductivity. The present work summarizes the processing steps from the template foam to the final cellular ceramic, functionalization strategies, and the most common characterization techniques.

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“…Although open cell foams are more suited to non‐structural applications, scientific papers often use structural performance indicators (e.g., the compressive strength) to evaluate the products of new processing technologies. On the other hand, when open‐cell metal foams are considered for catalytic applications, geometrical properties (e.g., the morphology and the size of pores and cells) are of greater importance, since they influence the thermal and mass transport properties of the support …”

Section: Introductionmentioning

confidence: 99%

Cost‐Efficient Aluminum Open‐Cell Foams: Manufacture, Characterization, and Heat Transfer Measurements

Monno

Negri²,

Mussi³

et al. 2018

Adv Eng Mater

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Metal foams may have applications in the field of catalytic supports, but the available manufacturing processes are too expensive for industrial use. The goal of the paper is to investigate and compare alternative cost-efficient manufacturing methods, aimed at producing open-cell aluminum foams for low-temperature catalytic applications. The explored process chains are 1) solid state bonding of stacked thin slices of closed cell foams; 2) the conventional method of sintering and dissolution of aluminum powders with space holder; 3) sintering and dissolution of recycled aluminum turning chips with space holder. The process chains and their main parameters are described in detail. The morphological properties of the produced open-cell foam samples, relevant to catalytic applications (cell size, hydraulic porosity, total porosity, surface to volume ratio), are measured and compared. Finally, their heat transfer properties are experimentally compared. The foams produced by the sintering and dissolution process exhibit the most favorable compromise among the goals of reducing the manufacturing cost, increasing the heat transfer coefficients, controlling the cell morphology.

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Assessment of Periodic Open Cellular Structures for Enhanced Heat Conduction in Catalytic Fixed‐Bed Reactors

Cited by 57 publications

References 23 publications

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

SMART‐Reactors: Tailoring Gas Holdup Distribution by Additively Manufactured Lattice Structures

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

Cost‐Efficient Aluminum Open‐Cell Foams: Manufacture, Characterization, and Heat Transfer Measurements

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