Top 7 Engrxiv Papers Today


2.015 Mikeys
#1. A Stochastically Homogenized Peridynamic Model for Intraply Fracture in Fiber-Reinforced Composites
Javad Mehrmashhadi, Ziguang Chen, Jiangming Zhao, Florin Bobaru
The quasi-static transverse fracture behavior in unidirectional fiber-reinforced composites (FRCs) is investigated using a new intermediately-homogenized peridynamic (IH-PD) model and a fully homogenized peridynamic (FH-PD) model. The novelty in the IH-PD model here is accounting for the topology of the fiber-phase in the transverse sample loading via a calibration to the Halpin-Tsai model. Both models can capture well the measured load-displacement behavior observed experimentally for intraply fracture, without the need for an explicit representation of microstructure geometry of the FRC. The IH-PD model, however, is more accurate and produces crack path tortuosity as well as a non-monotonic load-crack-opening softening curve, similar to what is observed experimentally. These benefits come from the preservation of some micro-scale heterogeneity, stochastically generated in the IH-PD model to match the composite’s fiber volume fraction, while its computational cost is equivalent to that of an FH-PD model. We also present a...
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engrXiv: "A Stochastically Homogenized Peridynamic Model for Intraply Fracture in Fiber-Reinforced Composites" - https://t.co/g4EZV6YljE #engineering
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Authors: 4
Total Words: 11878
Unqiue Words: 2978

2.012 Mikeys
#2. Improving the validation of turbulent jet breakup models
Ben Trettel
Understanding the physics of the breakup of turbulent liquid jets is important for a variety of applications including engine sprays, fire suppression systems, and water jet cutting. Models of turbulent jet breakup allow predictions of quantities of interest like the droplet size distribution and breakup length of the jet. These models are compared against experimental data in a process called validation. If the model predictions are within the experimental uncertainty, then the model is "validated" and believed to be accurate, and possibly can explain the physics. Uncertainty quantification is necessary for model validation. While unfortunately relatively few experimental studies quantify uncertainty, that is not the most pressing validation issue in turbulent jet breakup. I detail 3 additional problems that can make the apparent validation of a model actually an illusion, regardless of how well the model appears to match the data. These problems include: 1. important variables being omitted or guessed in experiments and models,...
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engrXiv: "Improving the validation of turbulent jet breakup models" - https://t.co/FmJ8Ck9Zlf #engineering
AbambresM: RT @engrXiv: "Improving the validation of turbulent jet breakup models" - https://t.co/FmJ8Ck9Zlf #engineering
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Authors: 1
Total Words: 12371
Unqiue Words: 3466

2.012 Mikeys
#3. Turbulent theory of velocity-profile-induced jet breakup
Ben Trettel
Velocity profile relaxation is commonly believed to be a cause of jet breakup. This claim is critically reevaluated in this work. Contrary to common belief, laminar liquid jets with parabolic velocity profiles are actually more stable than laminar jets with flatter velocity profiles. This is shown using prior theory and experiments. For turbulent jets, the influence of the velocity profile is more difficult to determine. Previous experimentalists claimed to show that the velocity profile has an effect by varying the nozzle length. The claim is that the boundary layer thickness grows with nozzle length, and that the larger the boundary layer, the less stable the jet. In this work, nozzle length is shown to be a poor proxy for velocity profile effects because the turbulence intensity also increases as the nozzle length increases. Studies with this confounding were ignored in this work. Thinner boundary layers have greater shear, yet experiments have shown that if the boundary layer were made thinner (all else constant), the jet...
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engrXiv: "Turbulent theory of velocity-profile-induced jet breakup" - https://t.co/AHQfSnSwiK #engineering
AbambresM: RT @engrXiv: "Turbulent theory of velocity-profile-induced jet breakup" - https://t.co/AHQfSnSwiK #engineering
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2.002 Mikeys
#4. Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)
Dung Van Nguyen, Pinthep Sethapokin, Harifara Rabemanolontsoa, Eiji Minami, Haruo Kawamoto, Shiro Saka, Edgar Davids
To valorize the underutilized nipa sap composed mainly of sucrose, glucose and fructose, acetic acid fermentation by Moorella thermoacetica was explored. Given that M. thermoacetica cannot directly metabolize sucrose, we evaluated various catalysts for the hydrolysis of this material. Oxalic acid and invertase exhibited high levels of activity towards the hydrolysis of the sucrose in nipa sap to glucose and fructose. Although these two methods consumed similar levels of energy for the hydrolysis of sucrose, oxalic acid was found to be more cost-effective. Nipa saps hydrolyzed by these two catalysts were also fermented by M. thermoacetica. The results revealed that the two hydrolyzed sap mixtures gave 10.0 g/L of acetic acid from the 10.2 g/L of substrate sugars in nipa sap. Notably, the results showed that the oxalic acid catalyst was also fermented to acetic acid, which avoided the need to remove the catalyst from the product stream. Taken together, these results show that oxalic acid hydrolysis is superior to enzymatic...
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engrXiv: "Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)" - https://t.co/HPlWtFSR4F #engineering
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Authors: 7
Total Words: 7827
Unqiue Words: 2467

2.002 Mikeys
#5. PULSE JET INTERNAL COMBUSTION ENGINE
Tim Walshaw
This article describes using the pulse jet to create circular motion. Such an engine would be highly efficient, simple and cheap to build, light weight, and could use a wide variety of liquid fuels. Such a pulse jet engine would be a very efficient substitute for the piston engine.
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engrXiv: "PULSE JET INTERNAL COMBUSTION ENGINE" - https://t.co/B2c8pHjzVk #engineering
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Authors: 1
Total Words: 4949
Unqiue Words: 1329

1.998 Mikeys
#6. Estimation of component-wise drag coefficient and Planform Visualization of CG for Various Sub Components
Anhad Singh Bajaj
The aim of this report, is to present an application of the preliminary design procedure followed in the course entitled “Airplane design(Aerodynamic)”. A 150 seater jet airplane cruising at M = 0.8, at 11 km altitude and having a gross still air range(GSAR) of 4000 km is considered.
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engrXiv: "Estimation of component-wise drag coefficient and Planform Visualization of CG for Various Sub Components" - https://t.co/mUCtcPOY93 #engineering
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Authors: 1
Total Words: 1580
Unqiue Words: 776

1.998 Mikeys
#7. Development of Flight Envelope of a Twin Turboprop Aircraft (ATR-72)
Anhad Singh Bajaj
The ATR 72 is a twin-engine turboprop, short-haul regional airliner developed and produced in France and Italy by aircraft manufacturer ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.). The number "72" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which could seat 72–78 passengers in a single-class arrangement.
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engrXiv: "Development of Flight Envelope of a Twin Turboprop Aircraft (ATR-72)" - https://t.co/HoeJcZJfnp #engineering
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Authors: 1
Total Words: 733
Unqiue Words: 395

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