The Effect of Porosity on The Temperature Spectrum Area and Heat Transfer in Chamber with Porous Media Under the Saturated Vapour Flow

Siswanto, Eko; Rifan, A. Zainur; Purnami,; Widhiyanuriyawan, Denny; Darmadi, Djarot B.

doi:10.1088/1757-899x/494/1/012071

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…So that the catalyst responsive to the energy received from the surrounding heat and converts it into electrical energy. The existence of pores decelerates the temperature gradient formation on the surface [44]. However, the heat that concentrated on smaller surface area may energize the pottery clay ionic edges.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

The analysis of Si/Al ratio on CGA decomposition in Indonesian traditional Kreweng pottery coffee roaster to maximize coffee acidity

Qiram

Hamidi

Yuliati

et al. 2022

EEJET

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The use of pottery pans lowers the roasting temperature and gives the product a more favorable taste. This study uncovers the role of pottery particle on chlorogenic acid (CGA) decomposition during roasting process. This study aims to design pottery pans and the roasting process that optimize the CGA content and quality of the coffee using Indonesian traditional ceramics from Banyuwangi, East java named Kreweng. The pottery was ground to between 74–1000 µm before activation. The elemental, phase, and morphology characterization performs on the coffee bean. The morphology characteristic of the pottery observed further using digital imaging technique to unravel the pores and boundaries. The impact of the pottery usage for coffee roasting also tested through coffee product pH measurement. The pottery morphology determines coffee product acidity. The smaller the pottery catalyst particle size results in more acid coffee. The pore and grain boundary concentration increases as the particle size decreases. At the same time, the Si/Al ratio was higher at the smaller catalyst particle size with higher porosity, grain boundaries, and absorption. The porosity and defects reveal the negatively charged faces of the pottery crystal edges. The charged faces revealed due to the pottery crystal vibration in response to heat during roasting process. The effectiveness of surface contact is greater due to the distribution of negative charges around the pores that attract OH- side of CGA. This interaction traps hydrogen proton on catalyst conductive surface. As a result, the CGA decomposes into several groups of atoms and molecules including H2 and CO2. The interaction with the catalyst transforms the macronutrient into aliphatic acid. Therefore, roasting media with a higher Si/Al ratio at smaller particle sizes with high micropores will increase the rate of decomposition and the acidity of coffee products.

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

The analysis of Si/Al ratio on CGA decomposition in Indonesian traditional Kreweng pottery coffee roaster to maximize coffee acidity

Qiram

Hamidi

Yuliati

et al. 2022

EEJET

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show abstract

“…To minimize the occurrence of condensation, the porous media are used. The greater the ability of the media to absorb water, the less condensate will stick to the surface walls [5]. This mechanism occurs because of the Van Der Walls force that is the attractive force between molecules, atoms or ions [6].…”

Section: Introductionmentioning

confidence: 99%

Heat Flux Condensation on Coconut Shell Activated Charcoal Porous Media

Praswanto¹,

Asroni²,

Priyasmanu³

et al. 2020

JSAE

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One way to keep the air humidity is by increasing the heat transfer with the porous media model. Increasing heat transfer depends on the value of the heat flux on the porous media. The heat flux value can be determined by inserting the porous media into the test section and then flow the vapor. The amount of heat absorbed is influenced by the large diameter of the porous on the media used. Therefore, this study aimed to optimize coconut shell charcoal by activating the charcoal. The purpose of activating coconut shell charcoal is to enlarge the pores so that it absorbs heat better than charcoal that has not been activated. The research method used is an experimental method and compares the results of research with previous studies. The porous media was vaporized for 60 minutes with a vapor temperature of 30 °C, while the vapor speed was varied, namely 1 m/s, 2m/s and 3 m/s. From the research results, that by using coconut shell activated charcoal, the heat flux value was higher than using coconut shell charcoal media. This is because the pore size in activated charcoal is larger and more numerous than charcoal that has not been activated so that it absorbs more heat. In addition, the greater the vapor speed, the higher the heat flux, because in the test section more vapor enters than vapor that comes out so that the porous media has a long time to absorb heat in the vapor. The heat transfer that occurs in porous media includes forced convection heat transfer because it has a value of Gr/Re2 < 1.

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The Effect of Porosity on The Temperature Spectrum Area and Heat Transfer in Chamber with Porous Media Under the Saturated Vapour Flow

Cited by 2 publications

References 2 publications

The analysis of Si/Al ratio on CGA decomposition in Indonesian traditional Kreweng pottery coffee roaster to maximize coffee acidity

The analysis of Si/Al ratio on CGA decomposition in Indonesian traditional Kreweng pottery coffee roaster to maximize coffee acidity

Heat Flux Condensation on Coconut Shell Activated Charcoal Porous Media

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