Selection of convective rolls in a thin evaporating-fluid layer in an air flow

2008 ◽  
Vol 43 (1) ◽  
pp. 49-58
Author(s):  
V. P. Reutov ◽  
G. V. Rybushkina
Keyword(s):  
Fluid Layer ◽  
Air Flow ◽  
Convective Rolls ◽  
Selection Of

Selection of convective rolls in a thin evaporating-fluid layer in an air flow

2008 ◽  
Vol 43 (1) ◽  
pp. 49-58 ◽  
Author(s):  
V. P. Reutov ◽  
G. V. Rybushkina
Keyword(s):  
Fluid Layer ◽  
Air Flow ◽  
Convective Rolls ◽  
Selection Of

PATTERNS, DEFECTS, AND EVOLUTION OF BÉNARD–MARANGONI CELLS

1996 ◽  
Vol 06 (09) ◽  
pp. 1665-1671 ◽  
Author(s):  
J. BRAGARD ◽  
J. PONTES ◽  
M.G. VELARDE
Keyword(s):  
Fluid Layer ◽  
Ambient Air ◽  
Finite Geometry ◽  
Amplitude Equations ◽  
Ginzburg Landau ◽  
Weakly Nonlinear ◽  
Numerical Exploration ◽  
Ginzburg Landau Equations ◽  
Rigid Plane ◽  
Selection Of

We consider a thin fluid layer of infinite horizontal extent, confined below by a rigid plane and open above to the ambient air, with surface tension linearly depending on the temperature. The fluid is heated from below. First we obtain the weakly nonlinear amplitude equations in specific spatial directions. The procedure yields a set of generalized Ginzburg–Landau equations. Then we proceed to the numerical exploration of the solutions of these equations in finite geometry, hence to the selection of cells as a result of competition between the possible different modes of convection.

scholarly journals Impact Analysis and Selection of Spray Drying Parameters for Dawn and Feather Protein Hydrolysates

2019 ◽  
Vol 49 (3) ◽  
pp. 390-396
Author(s):  
Анастасия Пискаева ◽  
Anastasiya Piskaeva ◽  
Ольга Бабич ◽  
Olga Babich ◽  
Йонг Янг ◽  
...  
Keyword(s):  
Amino Acids ◽  
Spray Drying ◽  
Flow Rate ◽  
Mass Fraction ◽  
Air Flow ◽  
Feed Additives ◽  
Waste Products ◽  
Drying Temperature ◽  
Promising Source ◽  
Selection Of

Down and feather waste represents a promising source of feed protein. The main component of feather is protein, predominantly β-keratine. Keratin is a mechanically durable and chemically unreactive protein with cistein, glutamine, and protein as dominating amino acids in its structure. According to the chemical composition (amino acid content, balance of micro-and macronutrients), the feather raw material is a valuable source of nutrients as a component of feed additives. The aim of this work was to analyze the efficiency and selection of parameters of spray drying of hydrolysate of feather and down waste products. Dry feed additives obtained by spray drying have a lot of advantages, such as dosing accuracy, compactness, storage time, and a possibility of targeted use in dissolved form. In addition, they are easy to package and transport. The most important quality indicators of feed additives include the mass fraction of moisture and the yield of the finished product. The main parameters of spray drying that affect the mass fraction of moisture and the yield of the final product are the drying temperature, aspiration (air flow rate), and the rate of solution feeding to the installation. According to the experiment conducted, the spray drying temperature of 70.0 ± 5.0°C caused no loss of essential amino acids. In addition, no undesirable substances were formed, unlike in other technologies that use hightemperature treatment (90–120 ± 5.0°C) and hydrolysis, which reduces the biological value of the feed product. This temperature was found optimal for keratin hydrolysates during drying. The optimal value of the parameter of the solution flow rate was 6.5 ± 0.5 ml/min. The optimal range of air flow rates during spray drying of hydrolysates of feather raw materials was 20.0 ± 5.0 m3/h. This temperature provides the maximum yield of the finished product and the minimum mass fraction of moisture.

Design, calibration and calculation for flow-through respirometry systems

2001 ◽  
Vol 49 (4) ◽  
pp. 445 ◽  
Author(s):  
P. C. Withers
Keyword(s):  
Air Flow ◽  
Carbon Dioxide Production ◽  
Gas Composition ◽  
Evaporative Water ◽  
Standard Values ◽  
Flow Through ◽  
Gas Flame ◽  
Measure Oxygen Consumption ◽  
Composition I ◽  
Selection Of

Flow-through respirometry systems that measure oxygen consumption (VO2), carbon dioxide production (VCO2) and evaporative water loss (EWL) require the accurate calibration of the flow meter and three separate analysers (O2, CO2 and H2O vapour). Correct measurement of VO2, VCO2 and EWL depends on the incurrent air flow (VI) and its condition (e.g. dry, CO2-free), and the excurrent air flow (VE) and its condition (e.g. dry, CO2-free), which can differ in different parts of the excurrent circuit. Usually either VI or VE is measured and the other is calculated from the gas composition. I describe here a procedure for precise calibration of CO2 and H2O analysers in a flow-through respirometry system by reference to a calibrated O2 analyser, using a small gas flame. Generic equations are derived for calculation of VO2, VO2 and EWL with a variety of configurations for a flow-through respirometry system. Procedures for selection of data from continuous records of VO2, VCO2 and EWL for calculation of minimal (basal or standard) values are briefly described. Finally, the importance of the correct order of data treatment prior to calculation is described.

scholarly journals DESIGN OF WORK SLOW WIND-WHEEL POWER PLANT WITH PADDLES OF PERMANENT TYPE AFTER ITS RADIUS

2014 ◽  
pp. 78-86
Author(s):  
Roman Zinko ◽  
Taras Kruts ◽  
Ihor Lozovyj
Keyword(s):  
Power Plant ◽  
Air Flow ◽  
Power Installation ◽  
Low Speed ◽  
Axis Of Rotation ◽  
Method Of Determination ◽  
Optimal Profile ◽  
Nominal Capacity ◽  
Slow Wind ◽  
Selection Of

The task of optimizing velocity rotation of low-speed wind-wheel and optimal profile of its paddles according to criterion at most possible selection of power from weak air flow is set and worked out in the article. The method of determination the necessary angles of own turn of paddles and axis of rotation of wide-wheel shaft with higher speed of air flow with the aim of support nominal capacity of wide-power installation is suggested.

scholarly journals The Role of Modelling and Simulation in the Preparations for Flight Trials Aboard the Queen Elizabeth Class Aircraft Carriers

2018 ◽  
Author(s):  
M F Kelly ◽  
N A Watson ◽  
S J Hodge ◽  
M D White ◽  
I Owen
Keyword(s):  
Planning Process ◽  
Computer Modelling ◽  
Air Flow ◽  
Research Programme ◽  
Modelling And Simulation ◽  
Flight Simulator ◽  
Small Scale ◽  
High Fidelity ◽  
The University ◽  
Selection Of

This paper provides a brief overview of how modelling and simulation has been used to inform preparations for First of Class Flight Trials (FOCFT) aboard HMS Queen Elizabeth, the first of the United Kingdom’s two new Queen Elizabeth Class aircraft carriers, from the perspective of a collaborative research programme undertaken by industry and academia to develop high-fidelity simulations of the carrier’s ‘airwake’.  Computer modelling of the unsteady air flow over the carrier, and of the aircraft flight dynamics, have been integrated into high-fidelity flight simulators at BAE Systems Warton, and at the University of Liverpool.  The Queen Elizabeth Class (QEC) carriers have primarily been designed to operate the Short Take-Off and Vertical Landing (STOVL) variant of the Lockheed Martin F-35 Lightning II multirole fighter aircraft and will also operate a range of rotary-wing assets.  Computational Fluid Dynamics (CFD) has been used to compute the time-varying air flow over and around the 280m long ship, along the F-35B landing approach path and up to 400m astern of the ship.  The paper shows a selection of results from the full-scale CFD analysis, and the results from a small-scale experiment that was conducted to provide confidence in the validity of the computed airwakes.  The QEC airwakes have been employed by BAE Systems in its fixed-wing flight simulator at Warton, where test pilots have conducted simulated deck landings for a variety of wind over deck conditions, so providing experience for F-35B test pilots and the ship’s Flying Control (FLYCO) crew ahead of FOCFT, which will be conducted later this year.  Airwakes have also been implemented in the HELIFLIGHT-R flight simulator at the University of Liverpool, where helicopter landings to the QEC have been simulated using a generic medium-weight maritime-helicopter model. A selection of results from the helicopter flight simulator trials is presented in terms of the workload ratings reported by test pilots, and these are related to the characteristics of the computed airwake at the landing spots tested.  The paper demonstrates how modelling and simulation can be used to reduce both the risk and cost of flight trials, by informing the FOCFT planning process, and by highlighting, in advance of the trials, which wind speed and azimuth combinations may require more focus. 

scholarly journals AIR FLOW MEASUREMENTS IN A SCALE MODEL OF A ROOM AND METHOD SELECTION OF SEEDING WITH TRACER PARTICLES

2013 ◽  
Vol 78 (690) ◽  
pp. 631-638 ◽  
Author(s):  
Shin-ichi AKABAYASHI ◽  
Takuya OSHIMA ◽  
Yuki ARINAMI ◽  
Hajime OKUBO ◽  
Xiaoyun YANG ◽  
...  
Keyword(s):  
Air Flow ◽  
Scale Model ◽  
Flow Measurements ◽  
Method Selection ◽  
Tracer Particles ◽  
Selection Of

scholarly journals VALIDATION OF FILTRATION EQUIPMENT FOR AIR DEDUSTING IN SUBWAYS

2021 ◽  
Vol 2 (4) ◽  
pp. 14-21
Author(s):  
Timofey S. Oshchepkov ◽  
Lavrenty A. Kiyanitsa ◽  
Ivan V. Lugin
Keyword(s):  
Air Flow ◽  
Air Filters ◽  
Piston Effect ◽  
Geometry Design ◽  
Flow Parameters ◽  
Filtration Equipment ◽  
Subway Stations ◽  
And Performance ◽  
Selection Of

Subways, as the places where a large number of people are present, are put under under stringent standards of high microlimate and air quality, namely, the content of air-borne dust. In order to maintain dust concentration within the permissible limits, it is suggested to install air filters at ventilation connections at subway stations, which are affected by the piston effect. Using the earlier experimental results, the nonstationary air flow parameters under the piston effect and the structure of air flow at the ventilation connections at subway stations are determined in two-dimensional layout, which allows selection of filtration equipment for removal of dust from subway air, and enables determination of the equipment location at ventilation connections. In order to validate the filtration equipment selection, the review and analysis of the geometry, design and performance of the available facilities are carried out. The most suitable filtration equipment for air dedusting is suggested.

Cognitive gadgets and cognitive priors

2019 ◽  
Vol 42 ◽  
Author(s):  
Gian Domenico Iannetti ◽  
Giorgio Vallortigara
Keyword(s):  
Cognitive Neuroscience ◽  
Selection Of

Abstract Some of the foundations of Heyes’ radical reasoning seem to be based on a fractional selection of available evidence. Using an ethological perspective, we argue against Heyes’ rapid dismissal of innate cognitive instincts. Heyes’ use of fMRI studies of literacy to claim that culture assembles pieces of mental technology seems an example of incorrect reverse inferences and overlap theories pervasive in cognitive neuroscience.

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