Development of CFD model for the analysis of a cryogenics twin-screw hydrogen extruder system

Verma, Shashi Kant; Gupta, Vishal; Mukherjee, Sayantan; Gangradey, Ranjana; Srinivasan, R.

doi:10.1016/j.cryogenics.2020.103232

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…The above description is just one of the main foaming and devolatilization paths in the extruder. Because of the complexity of the shear flow field and the existence of local backmixing [ 18,32 ] in the melt, there might be other explanations of the bubble behavior that need to be further verified by experiments.…”

Section: Resultsmentioning

confidence: 99%

Effects of shear stress on the behavior of volatile bubbles in the high‐density polyethylene melt

Huang

et al. 2022

Polymer Engineering & Sci

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A novel visualization system, in which polymer melt is sheared by a sliding plate, was established to simulate different pressure shear zones of the screw extruder. In this work, the nucleation, growth, coalescence, and breakup of n‐hexane bubbles in the high‐density polyethylene (HDPE) melt under shear stress were observed through a high‐speed camera. It was found that the nucleation rate of bubbles in the HDPE melt increased with the shear rate. Moreover, the bubble diameter at high‐pressure shear zones decreased with time until bubbles disappeared but increased with time at low‐pressure shear zones. A modified prediction model of bubble coalescence time at high‐pressure shear zones was established, and the relative deviation was less than 1%. Three bubble breakup modes, that is, tensile breakup, erosive breakup, and breakup at the gas–liquid interface, were observed under shear. Finally, a new mechanism of foam devolatilization in the screw extruder was proposed.

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Section: Resultsmentioning

confidence: 99%

Effects of shear stress on the behavior of volatile bubbles in the high‐density polyethylene melt

Huang

et al. 2022

Polymer Engineering & Sci

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“…The overall acceptance marginally increased with an increase in screw speed (X 2 ). Heat dissipation occurs because of the mechanical movement of the internal screw during the operation of the extruder (Verma et al, 2021). Therefore, the mechanical rotational energy of the motor is supplied, and part of it is converted into heat energy.…”

Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

Optimization of extrusion cooking conditions for seasoning base production from sea mustard (Undaria pinnatifida)

Lee¹,

Shin²,

Ahn³

et al. 2022

Fish Aquat Sci

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Sea mustard (Undaria pinnatifida), an important edible seaweed belonging to the brown algal family of Alariaceae, contains copious physiologically active substances. It has long been popular in Korea as a food and is frequently consumed in the form of soup. It is also commercially available as a home meal replacement. In this study, we developed a seasoning key base with a high degree of sensory preference from sea mustard using the extrusion cooking process. Extrusion cooking conditions were optimized through response surface methodology. Barrel temperature (X 1 , 140℃-160℃) and screw speed (X 2 , 158-315 rpm) were set as independent variables, and overall preference was determined as the dependent variable (Y, points). An optimal condition was obtained at X 1 = 148.5℃ and X 2 = 315 rpm, and the dependent variable (Y, overall acceptance) was 7.95 points, similar to the experimental value of 7.81. Umami taste had a relationship with the overall acceptance of sea mustard seasoning. In the electronic nose and tongue, increased sourness and umami intensities were associated with the highest sensory score. The samples were separated well by each characteristic via principal component analysis. Collectively, our study provides imperative preliminary data for the development of various seasonings using sea mustard.

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“…This is called reactive extrusion polymerization [ 10 ]. Sobhani, H. and Verma, S. K. et al [ 11 , 12 ] combined the virtual domain method with the finite element method to study the flow characteristics of polymer melt in the conveying zone of an intermeshing rotating twin-screw extruder under isothermal conditions. With the development of computational methods, more and more researchers are using numerical simulation to study the non-isothermal flow mechanism in TSEs [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Simulation and Safety Analysis of Twin-Screw Extrusion Process for Synthetizing Glycidyl Azide Polymer-Based Energetic Thermoplastic Elastomer

Yuan,

Liu,

Wang

et al. 2023

Polymers

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In order to study the temperature variation and flow characteristics in the twin-screw reactive extrusion process of synthetizing glycidyl azide polymer-based energetic thermoplastic elastomer (GAP-ETPE), a non-isothermal simulation and a safety analysis were carried out. Firstly, based on the synthesis principle of GAP-ETPE, a mechanical sensitivity test, viscosity test and differential scanning calorimetry (DSC) of GAP-ETPE were carried out. Secondly, a three-dimensional physical model of the intermeshing co-rotating conveying element was established by Gambit. A three-dimensional non-isothermal numerical simulation of the conveying and kneading elements was carried out using FLUENT 19.0 software. The temperature, pressure and shear stress field of conveying and kneading elements with different staggered angles were analyzed and compared. The results show that the maximum temperature of the kneading element is always slightly higher than that of the conveying element at the same rotational speed, but the average temperature in the flow channel is always slightly higher than that of the kneading element. The inlet and outlet pressure difference of the kneading elements with a 90° offset angle is the smallest and the safety is the highest. The shear stress in the flow channel of the conveying element is higher than that of the kneading element as a whole, but the shear stress near the outlet of the 90° kneading element is higher than that in the flow channel of the conveying element. Among the kneading elements, the 90° kneading element has the strongest dispersing and mixing ability, followed by the 60° and 45° kneading elements. According to the thermal and physical parameters of the material, the ignition response time is approximately 6 s, which provides a theoretical guide for the safety design of the GAP-ETPE twin-screw extruder.

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Development of CFD model for the analysis of a cryogenics twin-screw hydrogen extruder system

Cited by 5 publications

References 8 publications

Effects of shear stress on the behavior of volatile bubbles in the high‐density polyethylene melt

Effects of shear stress on the behavior of volatile bubbles in the high‐density polyethylene melt

Optimization of extrusion cooking conditions for seasoning base production from sea mustard (Undaria pinnatifida)

Non-Isothermal Simulation and Safety Analysis of Twin-Screw Extrusion Process for Synthetizing Glycidyl Azide Polymer-Based Energetic Thermoplastic Elastomer

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