The Effect of Velocity Ratio Study on Microchannel Hydrodynamics Focused of Mixing Glycerol Nitration Reaction

Susilo, Sugeng Hadi; Suparman, Sudjito; Mardiana, Diah; Hamidi, Nurkholis

doi:10.3311/ppme.8894

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…Diffusion that occurs during chaotic motion is the main object of mixing [13]. Diffusion occurs when a drop of colour is stretched into thin lines, then separated.…”

Section: Engineeringmentioning

confidence: 99%

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

Susilo

Asrori

2021

Eureka: PE

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Turbulent mixing can damage the material molecules because of turbulence. Whereas laminar mixing raises a problem when mixing is carried out on viscous liquids. The mixing mechanism using chaotic flow affects the mixing quality. The aim of the experiment was to determine the position and direction of the double stirrer chaotic mixer. The installation of a chaotic mixer uses a cylindrical tub and two different mixers consisting of a primary mixer (Pp) and a secondary mixer (Ps). Periodically rotate the container and stirrer. The center of the vessel and primary mixer are placed at the same coordinates. For ε=4 cm (Pp to Ps distance), there are three experiments, namely: vessel rotation and directional stirrer (P2S-a), vessel rotation and opposite stirrer (P2B-a), and vessel rotation, both primary and secondary stirrers are directional variations. (P2V-a). Eccentricity 7 cm, there are also three treatments as above: one direction (P2S-b), reverse direction (P2B-b), and variation of direction (P2V-b). The video camera recordings are processed digitally. Qualitative data show a pattern of behavior during mixing. Meanwhile, quantitative data is used to determine the level of mixing effectiveness. The results showed that the direction of rotation of the two cylinders had no effect on the effectiveness of chaotic mixing. Based on the number of initial droplets of dye, the treatment that experienced the fastest chaos was P2B-b, at n=2 and r=3.5303. The difference in the number of color droplets does not affect chaotic behavior. The highest mixing efficiency was generated by the lowest P2V-b mixing index value of 0.94. Simultaneously, the direction between the mixer and the container will provide maximum mixing efficiency. Isolated mixing areas (island) and areas of poor mixing occur because of one-way rotation and low eccentricity

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“…Diffusion that occurs during chaotic motion is the main object of mixing [13]. Diffusion occurs when a drop of colour is stretched into thin lines, then separated.…”

Section: Engineeringmentioning

confidence: 99%

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

Susilo

Asrori

2021

Eureka: PE

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“…This protective material must have a high conductance. Currently, the protective material uses a metal coating material, which is used as EMI protection [8,9]. However, the metal shields have disadvantages related to poor mechanical flexibility, weight, corrosion, whereas polymers have the advantage to overcome metal weaknesses [10].…”

Section: The Aim and Objectives Of The Studymentioning

confidence: 99%

An analysis of effect of water hyacinth carbonization temperature on fabrication and EMI shielding radar

Imammuddin

Suparman

Suprapto

et al. 2021

EEJET

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The need to increase the ability of water hyacinth composites as EMI radar protection is related to the carbonization process of organic materials. This research aimed to determine the effect of water hyacinth carbonization temperature on the effectiveness of fabrication and EMI shielding radar. The research method includes the preparations such as cutting, washing, and drying the water hyacinth. The drying process is carried out using an oven with a temperature of 70 °C for 4 days. Then the water hyacinth is mashed until it reaches the 80 mesh size. Then the carbonization process is carried out, with variations in carbonization temperature ranging from 500 °C, 600 °C, 700 °C, 800 °C, 900 °C and 1,000 °C, with a heat increase speed of 3 °C/minutes. After reaching the specified temperature, a holding time is then carried out for 1 hour. Furthermore, the composite composition of 30 % water hyacinth activated carbon powder and 70 % phenol-formaldehyde (PF) resin was molded using a hot press with a pressure of 300 kg/cm2 at 180 °C for 10 minutes. The results showed that the water hyacinth composite could be used as an EMI protection material at the X-Band frequency (8–12.5 GHz). Where the electrical conductivity and EMI SE increases with increasing carbonization temperature. Water hyacinth composites at a carbonization temperature of 1,000 °C showed the highest electrical conductivity and the highest EMI SE, respectively 4.64∙10-2 S/cm and 41.15 dB (attenuation 99.99 %) at a frequency of 8 GHz. The high absorption contribution is associated with the synergy combination of KCl and the pore structure of the goitre. KCl contributes to the magnetic properties and pore structure with high electrical conductivity values

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“…To improve surface hardness, wear resistance uses diffusion and thermochemical surface treatment techniques, such as carburizing [5], nitriding [6], nitro-carburizing [7], and ion implantation [8]. In all heat treatment processes, the temperature is kept below 500 °C.…”

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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The Effect of Velocity Ratio Study on Microchannel Hydrodynamics Focused of Mixing Glycerol Nitration Reaction

Cited by 9 publications

References 14 publications

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

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

An analysis of effect of water hyacinth carbonization temperature on fabrication and EMI shielding radar

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

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