Experimental investigation of green brick shrinkage behavior with Bigot’s curves

Mançuhan, Ebru; Özen, Selin; Sayan, Perviz; Titiz‐Sargut, Sibel

doi:10.1080/07373937.2015.1135340

Cited by 27 publications

(16 citation statements)

References 20 publications

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“…Below the critical MR , the volumetric change of poria cubes was minor and no longer proportional to the volume of moisture evaporation, and the cracking and breaking were also minor. At this stage, the VD should be switched to other rapid drying methods to reduce the overall drying time [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Vacuum and Infrared-Assisted Hot Air Impingement Drying for Improving the Processing Performance and Quality of Poria cocos (Schw.) Wolf Cubes

Zhang

Chen

Pan

et al. 2021

Foods

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The objective of this study was to develop an efficient drying technology for poria cubes in order to improve product quality. Poria cubes were dried using different methods, including air impingement drying, infrared-assisted air impingement drying, vacuum drying, two-stage vacuum drying, and infrared-assisted air impingement drying. The results were compared with those from hot air drying. For the two-stage drying, the tested conditions were the first stage of vacuum drying with temperatures between 65–85 °C and a switching moisture ratio of 70–90%. The second stage infrared-assisted air impingement drying also had temperatures 65–85 °C. The drying kinetics (effective moisture diffusivity (Deff), Biot number (Bi), and mass transfer coefficient (k) were studied via the product qualities (broken ratio, firmness, microstructure, and water-soluble polysaccharide content) and specific energy consumption (SEC) of the drying processes. The results showed that two-stage drying led to the lowest drying time and energy consumption, and also obtained the best qualities. Box–Behnken experimental design with response surface methodology (RSM) was used to optimize the two-stage operating conditions as 82 °C under vacuum drying until a moisture content of 81% and a temperature of 69 °C with infrared-assisted air impingement drying was achieved. These findings suggested that two-stage vacuum and infrared-assisted air impingement drying is a promising method for producing high quality and energy efficient dried poria cubes.

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Section: Resultsmentioning

confidence: 99%

Vacuum and Infrared-Assisted Hot Air Impingement Drying for Improving the Processing Performance and Quality of Poria cocos (Schw.) Wolf Cubes

Zhang

Chen

Pan

et al. 2021

Foods

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“…The literature on drying divide this process into an initial, constant shrinking rate stage, and a final declining rate stage with only minor shrinkage (see, eg, Refs. ). These two drying stages become evident in a plot of drying shrinkage versus moisture content.…”

Section: Introductionmentioning

confidence: 97%

“…The water in clays creates ceramic masses that can be molded with ease. This property, called plasticity, is characteristics of clay minerals . The water in clays can be either interstitial or free water, also known as plasticity water.…”

Section: Introductionmentioning

confidence: 99%

“…The shrinkage of ceramic bodies upon drying depends on dry air parameters, including temperature, stream velocity and humidity, and also on the red ceramic properties, as initial moisture content, clay percentage, and product geometry . The literature on drying divide this process into an initial, constant shrinking rate stage, and a final declining rate stage with only minor shrinkage (see, eg, Refs.…”

Section: Introductionmentioning

confidence: 99%

“…These two drying stages become evident in a plot of drying shrinkage versus moisture content. This plot, also known as drying curve or Bigot's plot, allows to determine the critical point which separates the initial constant drying rate period from the final drying stage . The Bigot's curve is a useful graphical tool used to optimize the drying process, with consequent gains in energy consumption and reduction of the number of defective ceramic parts …”

Section: Introductionmentioning

confidence: 99%

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A heuristic approach to the automated analysis of drying curves

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In the context of ceramics production, the purpose of drying is to remove water from a ceramic body after forming. Drying should be performed at an appropriate rate, at an acceptable cost, and in such a way as not to damage the ceramic body. Although the determination of the best drying conditions is critical to ceramics production, the experimental determination of drying parameters, particularly of the critical moisture content, use to be very subjective. In this work, we propose an empirical mathematical expression, based on the generalized logistic model, which is capable of describing the complete drying curve. The critical moisture is thus unambiguously obtained as the intersection point of two straight lines derived from the mathematical modeling of the full drying curve. The heuristic proposed in this work may find particular application in automated procedures, data acquisition, and analysis of drying curves of ceramic masses.

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Ceramic technology. How to reconstruct the firing process

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Experimental investigation of green brick shrinkage behavior with Bigot’s curves

Cited by 27 publications

References 20 publications

Vacuum and Infrared-Assisted Hot Air Impingement Drying for Improving the Processing Performance and Quality of Poria cocos (Schw.) Wolf Cubes

Vacuum and Infrared-Assisted Hot Air Impingement Drying for Improving the Processing Performance and Quality of Poria cocos (Schw.) Wolf Cubes

A heuristic approach to the automated analysis of drying curves

Ceramic technology. How to reconstruct the firing process

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