Ceramic block packing of Honeycomb type for absorption processes and direct heat transfer

Darakchiev, Rumen; Darakchiev, Simeon; Dzhonova-Atanasova, Daniela; Nakov, Svetoslav

doi:10.1016/j.ces.2016.07.028

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…The fact that the ceramic block presents a more compact and smoother surface can hinder the water transportation since the fluid is more restricted in a saturated pore system (Ren et al, 2019;Hatungimana et al, 2019). This characteristic may result in a more porous interface of the mortar and, consequently, reduce the mechanical strength of the structure (Darakchiev et al, 2016;Hála et al, 2018).…”

Section: Figure 3 Strength Relationship Between Ceramic Prisms and Blocksmentioning

confidence: 99%

The influence of mortar strength on the mechanical behavior of ceramic and concrete structural masonry blocks

Bruschi

Gaio

Soares

2020

RCT

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This paper analyses the influence of mortar strength on the mechanical behavior of ceramic and concrete structural masonry blocks. Experimental tests of uniaxial compression were carried out on blocks as well as prisms, with mortar strengths lower, higher and within the limits of the Brazilian standard recommendation. The characteristic resistance of prisms (fpk) was lower than the blocks (fbk) in all combinations. The lowest decreases in strength occurred for both materials in the prisms with mortar strength within the limits indicated by the Brazilian standard. In addition, the ceramic materials were more sensitive to the variation on the mortar strength when compared to the concrete blocks.

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Section: Figure 3 Strength Relationship Between Ceramic Prisms and Blocksmentioning

confidence: 99%

The influence of mortar strength on the mechanical behavior of ceramic and concrete structural masonry blocks

Bruschi

Gaio

Soares

2020

RCT

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“…The extrusion process of ceramic pastes is commonly used for the production of high-value products, e.g., catalyst pellets for the chemical reactor (Devyatkov et al, 2016), honeycomb catalyst for purifying gas exhausted from an automobile (Govender and Friedrich, 2017), and ceramic packings for adsorption and direct heat transfer (Darakchiev et al, 2016). Recently, extrusion-based 3D printing was successfully applied for manufacturing of ceramic superconductors, zeolite monoliths, and porous scaffolds (Chen et al, 2019;Coucke et al, 2018;Vaezi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Modeling and Numerical Study of Ceramic Paste Extrusion

2021

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The extrusion processes of ceramic pastes, including 3D printing, are used for the production of high-value products. Ceramic paste extrusion is a complex process which depends on the paste rheological properties, die and extruder geometries, and operational parameters. Modeling and quantitative analysis of paste molding are important to design proper extrusion process for the production of high-value extrudates of desired strength, shape, and morphology. In this paper, the mathematical model of ram extrusion of ceramic materials is established, and the paste continuity and momentum equations for non-Newtonian fluid based on the modified Herschel-Bulkley viscous model were solved numerically. The effects of die geometry and paste feed rate on the distributions of paste velocity and pressure in the extruder and die were investigated numerically. As a result, the steeper radial profile of longitudinal velocity and higher value of longitudinal velocity were obtained in the narrow die. The pressure significantly increases in the die at a high feed rate, and the pressure profile is almost flat in the barrel. The rate of increase of the maximum pressure decreases with an increase of paste feed rate. The pressure steeply increases in the die of small diameter. The maximum pressure linearly increases with the ratio of die length to diameter.

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“…External variables affecting heat and mass transfer in influencing flow relies on mass flow rate, kind and state of the gas and on the figure, size and position of the nozzles relative to each other and to the solid area (Fan et al, 2018). The aim of this evaluation paper is to summarize the significant published articles on the increase of the forced convection heat transfer (Darakchiev et al, 2016). This article describes a general survey accentuating the engineering requests and experimental equations, offered for the prediction of heat and mass transfer coefficients within a great and technologically essential range of inconstants (Schaefer et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Measurement of Gas-Phase Mass Transfer Coefficients in a Humidification Column through Random Packing

Khorasani¹,

Zivdar²,

Tabrizi³

et al. 2019

American Journal of Engineering and Applied Sciences

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Packed columns are an important part of the broad selection of mass and heat transfer equipment. Nowadays, the use of packed columns is increasing, which is because of its lower pressure drop, higher capacity and higher mass transfer in comparison to tray columns. The experiential tests and the hypothetical analysis display that the chemical dehumidification of air by hygroscopic salt solutions confirms the stable reduction in humidity ratio, which is appropriate for uses to air conditioning or drying processes The mass transfer factors in the pulse were found to correspond nearly to the factors that would be achieved in the distributed bubble flow regime In the present study, parameters that affect column performance, such as, fluid retention and gas-phase mass transfer coefficient in a humidification column using random packing in towers with 0.1 m and 0.2 m diameters and 1m height, were measured Air velocity was 1.32 to 3.92 m 3 per hour and liquid velocity was 10 to 70 m 3 per hour. In this research, the Nakajima model was used to calculate the effective area. Thereafter, experimental values for gas-phase mass transfer coefficients were compared to Zech, Shi, Grouff, Shulman, Billet and Ondamodels The mean relative errors of these models with the present study's experimental findings were 7%, 15%, 29%, 21%, 45% and 195%. Findings showed that by decreasing the column diameter, the gas-phase mass transfer coefficient (K g .ae) also increases Further, the obtained retention values showed that retention in the column with a 0.1 m diameter was higher than the column with a 0.2 m column.

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Ceramic block packing of Honeycomb type for absorption processes and direct heat transfer

Cited by 12 publications

References 21 publications

The influence of mortar strength on the mechanical behavior of ceramic and concrete structural masonry blocks

The influence of mortar strength on the mechanical behavior of ceramic and concrete structural masonry blocks

Modeling and Numerical Study of Ceramic Paste Extrusion

Measurement of Gas-Phase Mass Transfer Coefficients in a Humidification Column through Random Packing

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