scholarly journals Impact of Holder Materials on the Heating and Explosive Breakup of Two-Component Droplets

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3307 ◽  
Author(s):  
Dmitry Antonov ◽  
Jérôme Bellettre ◽  
Dominique Tarlet ◽  
Patrizio Massoli ◽  
Olga Vysokomornaya ◽  
...  
Keyword(s):  
Heating Time ◽  
Droplet Breakup ◽  
Flue Gases ◽  
Boiling Temperature ◽  
Temperature Minimum ◽  
Heating Chamber ◽  
Nichrome Wire ◽  
Two Component ◽  
Integral Characteristics ◽  
Heat Carriers

The heating of two-component droplets and the following explosive breakup of those droplets have been extensively studied over the most recent years. These processes are of high interest, since they can significantly improve the performance of many technologies in fuel ignition, thermal and flame liquid treatment, heat carriers based on flue gases, vapors and water droplets, etc. Research throughout the world involves various schemes of droplet heating and supply (or, less frequently, injection) to heating chambers. The most popular scheme features the introduction of a two-component or multi-component droplet onto a holder into the heating chamber. In this research, we study how holder materials affect the conditions and integral characteristics of droplet heating and explosive breakup: heating time until boiling temperature; minimum temperature sufficient for droplet breakup; number and size of fragments in the resulting droplet aerosol, etc. Experiments involve droplets that are produced from flammable (oil) and non-flammable (water) components with significantly different thermophysical and optical properties, as well as boiling temperature and heat of vaporization. The most popular elements with the scientific community, such as ceramic, steel, aluminum, copper, and phosphorus rods, as well as a nichrome wire, serve as holders. We establish the roles of energy inflow from a holder to a droplet, and energy outflow in the opposite direction. We compare the holder results with a supporting thermocouple, recording the drop temperature under a heat transfer provided at 350°C. Finally, we forecast the conditions that are required for a significant improvement in the performance of thermal and flame water treatment through the explosive breakup of two-component droplets.

scholarly journals Explosive disintegration of two-component droplets in a gas flow at its turbulization

2019 ◽  
Vol 23 (5 Part B) ◽  
pp. 2983-2993
Author(s):  
Dmitrii Antonov ◽  
Pavel Strizhak
Keyword(s):  
Reynolds Number ◽  
Laminar Flow ◽  
Gas Flow ◽  
Combustion Products ◽  
Heating Time ◽  
Flue Gases ◽  
Relative Area ◽  
Heated Air ◽  
Two Component ◽  
Explosive Disintegration

The experimental results shown that the mode of droplet disintegration dominates in the laminar flow, and the intensive fragmentation is prevalent in the turbulent flow during almost the entire time of heating. Typical dependences of the time of droplet heatup before disintegration or fragmentation on the temperature, flow rate, structure and regime (laminar and turbulent) are established. The studies are conducted with heated air and flue gases to ensure the application of the research results in the technology of thermal and flame cleaning of liquids from irregular impurities. It is shown that in the flow of combustion products the droplet disintegration occurs 15-20% faster than in the air-flow. In this case, the explosive puffing is more often realized. At high-temperatures (more than 400?C) the characteristics of the explosive droplet disintegration in the studied flows are almost identical (differences in disintegration times do not exceed 5% at different flow turbulization). At lower temperatures, the disintegration times differ 3-4 times for the range Re = 2200-3400. In this case, the more Reynolds number is, the more intense is the fragmentation of two-component droplets throughout the heating time. Due to explosive disintegration of intensely evaporating two-component droplets the growth of the relative area of evaporation was 10-25 times.

How to calculate and estimate integral characteristics of ideal two-component stages with arbitrary enrichments per step

1973 ◽  
Vol 34 (4) ◽  
pp. 329-333 ◽  
Author(s):  
N. A. Kolokol'tsov ◽  
N. I. Laguntsov ◽  
G. A. Sulaberidze
Keyword(s):  
Two Component ◽  
Integral Characteristics

scholarly journals Suffix morphemes in the attributes of two-component attributive constructions as style distinctive markers of official discourse

2019 ◽  
Vol 12 (21) ◽  
pp. 224-233
Author(s):  
Ludmila Shapa ◽  
◽  
Olena Lebedieva ◽  
Olga Gvozd ◽  
◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Official Discourse ◽  
Two Component ◽  
Integral Characteristics

The article presents the comparative analysis results of differential and integral characteristics of suffix morphemes in the attributes of two-component attributive constructions which was carried out with the goal to identify attributes with suffixes as stylistic markers of official discourse.

scholarly journals Микровзрывная фрагментация группы неоднородных капель топлив

2020 ◽  
Vol 46 (10) ◽  
pp. 14
Author(s):  
Д.В. Антонов ◽  
П.А. Стрижак ◽  
Р.М. Федоренко
Keyword(s):  
High Temperature ◽  
Experimental Studies ◽  
Mutual Arrangement ◽  
Muffle Furnace ◽  
Delay Times ◽  
Two Component ◽  
Integral Characteristics ◽  
Explosive Fragmentation ◽  
Explosion Delay ◽  
Single Droplets

The results of experimental studies of the processes of micro-explosive fragmentation of two-component (diesel fuel – water) droplets upon heating in a high-temperature medium are presented. The experiments were carried out with a group of 10-30 falling drops in a tubular muffle furnace. Micro-explosion delay times are studied. It was shown that the mutual arrangement of the droplet group significantly affects the integral characteristics of the investigated process. Limit distances (from 8 to 10 radii) between the droplets are established at which the characteristics of the micro-explosion are similar to those recorded in experiments with single droplets.

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

A technique for protecting delicate specimens during processing

1989 ◽  
Vol 47 ◽  
pp. 982-983
Author(s):  
R.J. Mount ◽  
R.V. Harrison
Keyword(s):  
Basilar Membrane ◽  
Low Cost ◽  
Organ Of Corti ◽  
Region Of Interest ◽  
Sensory Epithelium ◽  
Physical Damage ◽  
Air Drying ◽  
Specimen Handling ◽  
Two Component

The sensory end organ of the ear, the organ of Corti, rests on a thin basilar membrane which lies between the bone of the central modiolus and the bony wall of the cochlea. In vivo, the organ of Corti is protected by the bony wall which totally surrounds it. In order to examine the sensory epithelium by scanning electron microscopy it is necessary to dissect away the protective bone and expose the region of interest (Fig. 1). This leaves the fragile organ of Corti susceptible to physical damage during subsequent handling. In our laboratory cochlear specimens, after dissection, are routinely prepared by the O-T- O-T-O technique, critical point dried and then lightly sputter coated with gold. This processing involves considerable specimen handling including several hours on a rotator during which the organ of Corti is at risk of being physically damaged. The following procedure uses low cost, readily available materials to hold the specimen during processing ,preventing physical damage while allowing an unhindered exchange of fluids.Following fixation, the cochlea is dehydrated to 70% ethanol then dissected under ethanol to prevent air drying. The holder is prepared by punching a hole in the flexible snap cap of a Wheaton vial with a paper hole punch. A small amount of two component epoxy putty is well mixed then pushed through the hole in the cap. The putty on the inner cap is formed into a “cup” to hold the specimen (Fig. 2), the putty on the outside is smoothed into a “button” to give good attachment even when the cap is flexed during handling (Fig. 3). The cap is submerged in the 70% ethanol, the bone at the base of the cochlea is seated into the cup and the sides of the cup squeezed with forceps to grip it (Fig.4). Several types of epoxy putty have been tried, most are either soluble in ethanol to some degree or do not set in ethanol. The only putty we find successful is “DUROtm MASTERMENDtm Epoxy Extra Strength Ribbon” (Loctite Corp., Cleveland, Ohio), this is a blue and yellow ribbon which is kneaded to form a green putty, it is available at many hardware stores.

The First Experience with new Small-Sized Commercial Tem (TEM -100) and Biological Specimens

1990 ◽  
Vol 48 (1) ◽  
pp. 611-611
Author(s):  
Jovan Vukovié
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Liquid Nitrogen ◽  
Boiling Temperature ◽  
Resolution Power ◽  
Application Fields ◽  
Working Liquid

Conventional electron microscope TEM -100 (Made by “ELECTRON”, Sumy, USSR; Fig. 1) was presented at the XI Int. Congress on Electron Microscopy (Kyoto) by I.S. Lyalko et al. (1,2). The purpose of the microscope constructors were to design a small-sized general conventional TEM for various application fields. The microscope have mini lenses, which winding is placed in closed casing and soaked in working liquid (low boiling temperature) but upper part of the casing being water cooled.In this communication we gave our first experience and impression as a customer, beginning from the montage, the instruction and the testing of the microscope to our application in the field of biological specimens. Just after montage of the microscope on the second floor, the test of the point resolution power was performed by Ir specimen. It was achieved 0.5 nm (Fig. 2 and 3) on the roll film (ORWO 22 DIN) with 300 OOOx magnification and anticontamination device. The ultimate vacuum (about 10exp-6 mm Hg, ion discharge pump) also achieved using large trap cooled by liquid nitrogen.

Fifth virial coefficient of a two-component mixture of hard discs

1997 ◽  
Vol 90 (4) ◽  
pp. 679-681
Author(s):  
F. SAIJA ◽  
G. FIUMARA ◽  
P.V. GIAQUINTA
Keyword(s):  
Virial Coefficient ◽  
Component Mixture ◽  
Two Component
Sign in / Sign up

Export Citation Format

Share Document