Analysis of Position and Rotation Direction of Double Stirrer on Chaotic Advection Behavior

Susilo, Sugeng Hadi; Asrori, Asrori

doi:10.21303/2461-4262.2021.001707

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…But in this case, what is meant by landfill is the land from former urban waste piles that is no longer used to accommodate waste. As a result of the activity of microorganisms, waste will undergo a decomposition process aerobically or anaerobically [9,10].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Sudjianto

Halim

Gembiranto

et al. 2021

EEJET

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The paper discusses the comparison of fly ash with Lapindo mud as a land stabilizer for a landfill in Pasuruan, Indonesia. Land for landfills has a low level of stability due to the condition of garbage that has accumulated and undergoes a process of decay. This land condition is less favorable to support the construction of the building above it if one day the location is used for construction. Therefore, it is necessary to stabilize the soil first. The purpose of this study was to determine the effect of adding a mixture of TPA soil with fly ash and Lapindo mud. The method used by sieve testing and compaction of the specimens for each treatment consisted of a mixture of TPA soil with fly ash and TPA soil with Lapindo mud, while the percentages of fly ash and Lapindo mud to the dry weight of the original soil were respectively 0 %, 10 %, 15 %, and 20 %. The results showed that stabilization of the landfill with fly ash reduced the silt content while stabilization with Lapindo mud increased the levels of silt in the landfill so that fly ash was better than Lapindo mud for stabilization of the landfill. The specific gravity values for both stabilization mixtures increased equally. Based on the results of the standard compaction test for the addition of a mixture of fly ash, the OMC value decreases and the greater the value of dmaxs indicates that fly ash is good for landfill stabilization, while the addition of a mixture of Lapindo mud increases the OMC the smaller the value of dmaxs. For the direct shear test of the two mixed soils, the value of the internal friction angle (Æ) increased. The percentage value of the optimum mixture of mixed soil+fly ash is 14 % with an internal shear angle (Æ) of 38°, while the stabilization of landfill with Lapindo mud obtained the optimum mixture percentage value of 11 % with an internal shear angle (Æ) of 31°

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Sudjianto

Halim

Gembiranto

et al. 2021

EEJET

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“…The stirring process in laminar flow with low Reynolds numbers can produce a very complex flow pattern [3]. The complexity of the flow pattern consists of many particles (microstructures) whose changes are influenced by fluid flow [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of stirrer and container rotation direction on mixing index (Ip)

Susilo

Asrori

Gumono

2021

EEJET

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The paper discusses the effect of the stirrer and container rotation direction on the mixing index (Ip). The chaos theory is the result of an in-depth study of various problems that cannot be answered by the two previous major theories, namely quantum mechanics and the theory of relativity. Effective mixing of the flow area does not depend on rapid stirring. This study uses a container with a double stirrer, camera, programmable logic controller, tachometer, 6 A adapter, and a computer. DC electric motor (25 V) for turning stirrers and housings. The diameter of the primary and secondary stirrers is Dp=38 mm and Ds=17 mm. The diameter of the container made of transparent plastic is Dw=160 mm and height is 170 mm. Primary stirrer rotation (np)=10 rpm, secondary stirrer rotation (ns)=22.3 rpm, and container rotation (nw)=13 rpm, the angular velocity of the container is Ww=360° while the angular speed of the primary stirrer is Wp=180°. The liquid consists of a mixture of water and paint (white). For dye, a mixture of water and paint (red) is used. For testing the Brookfield viscometer, the viscosity of the liquid and dye is used. The results showed that turning the stirrer in the opposite direction to the container, there will be stretching, bending, and folding around the stirrer, and the smallest mixing index was P2V-b (0.94). In addition, based on the mixing index value above, the highest mixing effectiveness level is obtained, namely: P2V-b, P2S-b, P2B-b, P2V-a, P2B-a, and finally P2S-a. The mixing index is inversely related to the effectiveness level. So the highest effectiveness level is given by the following treatment: 1. Variation rotation (between opposite rotating mixers), 2. Opposite rotation (stirrer rotation opposite direction to the container), 3. Unidirectional rotation (stirrer rotation in the direction of the container)

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“…The use of carburizing packs using charcoal as a carbon producer can increase the corrosion resistance of SUS 304L [8,9]. At the same time, [10] using CO/CO 2 gas on heating 500-700 °C and holding time 30-500 hours can form a uniform material and a surface that is not crusted on SUS 304.…”

Section: Introductionmentioning

confidence: 99%

The comparison pack carburizing-nitriding SUS 316 with gas type Welding Grade and Ultra High Purity

et al. 2021

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The paper discusses the comparison of pack carburizing-nitriding SUS 316 with gas Nitrogen. The purpose of this study was to increase the hardness and corrosion resistance of SUS 316. The research used a pack carburizing-nitriding method with gas type Welding Grade (WG) and Ultra High Purity (UHP). The pack carburizing process uses teak wood activated carbon and barium carbonate as a bio-photo catalyst. The specimens were put into a Sealed Steel Container containing teak wood activated carbon, with a depth of 1 cm below the activated carbon's surface. The test material is then heated until it reaches 850 °C and is held for 1 hour in a heating furnace. Furthermore, the nitriding process, the specimen is put into a tightly closed nitrogen tube, then nitrogen gas flows until the pressure reaches 41 bar and is held for 24 hours. They are using Welding Grade (WG) and Ultra High Purity (UHP) gas types. Furthermore, microVickers hardness testing, optical microscope, and Scan Electron Microscope (SEM) were carried out. The results of the study include a. There was an increase in violence by 41.7 % for UHP and WG (17.3 %). b. The formation of nitride compounds and carbon dissipation on the specimen surface in the UHP carburizing-nitriding pack treatment is more than WG. The formation of a nitride layer is indicated by its fine and dense morphology and film bonding to the substrate. The chemical composition affects the diffusivity of nitrogen atoms in modifying the surface layer of the substrate. The higher the nitride compound formed, the smoother the substrate surface. Also, with UHP treatment, the lower the elemental content of Cr makes SUS 316 more resistant to corrosion. So that SUS 316 UHP can be recommended for use as an implant material

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Analysis of Position and Rotation Direction of Double Stirrer on Chaotic Advection Behavior

Cited by 7 publications

References 12 publications

Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Analysis of the effect of stirrer and container rotation direction on mixing index (Ip)

The comparison pack carburizing-nitriding SUS 316 with gas type Welding Grade and Ultra High Purity

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