scholarly journals Measurement of Surface Tension for Molten Silver by Oscillating Droplet Method Using Electromagnetic Levitation Furnace

2008 ◽  
Vol 72 (9) ◽  
pp. 708-713 ◽  
Author(s):  
Keisuke Morohoshi ◽  
Shumpei Ozawa ◽  
Toshio Tagawa ◽  
Taketoshi Hibiya
Keyword(s):  
Surface Tension ◽  
Electromagnetic Levitation ◽  
Droplet Method

scholarly journals Surface Tension and Density of Liquid Hot Work Tool Steel W360 by voestalpine BÖHLER Edelstahl GmbH & Co KG Measured with an Electromagnetic Levitation Apparatus

2020 ◽  
Vol 42 (2) ◽  
Author(s):  
Thomas Leitner ◽  
Anna Werkovits ◽  
Siegfried Kleber ◽  
Gernot Pottlacher
Keyword(s):  
Surface Tension ◽  
Temperature Dependence ◽  
Linear Model ◽  
Tool Steel ◽  
Pure Iron ◽  
Electromagnetic Levitation ◽  
Liquid Density ◽  
Hot Work Tool Steel ◽  
Significant Difference ◽  
Main Component

AbstractW360 is a hot work tool steel produced by voestalpine BÖHLER Edelstahl GmbH & Co KG, a special steel producer located in Styria, Austria. Surface tension and density of liquid W360 were studied as a function of temperature in a non-contact, containerless fashion using the oscillating drop method inside an electromagnetic levitation setup. For both, surface tension and density, a linear model was adapted to present the temperature dependence of these measures, including values for the uncertainties of the fit parameters found. The data obtained are compared to pure iron (with 91 wt% the main component of W360), showing an overlap for the liquid density while there is a significant difference in surface tension (− 5.8 % at the melting temperature of pure iron of 1811 K).

scholarly journals Effect of Pesticide Addition Sequence on the Preparation of Phytosanitary Spray Solutions

2019 ◽  
Vol 37 ◽  
Author(s):  
M.F.T. RAMOS ◽  
R.T.S. SANTOS ◽  
D.P. ALMEIDA ◽  
J.F.D. VECHIA ◽  
M.C. FERREIRA
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Propionic Acid ◽  
Biological Effect ◽  
Surface Coverage ◽  
Mineral Oil ◽  
Application Rate ◽  
Physicochemical Interactions ◽  
Effect Of Treatment ◽  
Droplet Method

ABSTRACT: The addition of adjuvants to herbicide solutions is aimed at preserving or enhancing the biological effect of treatment. However, it is commonly performed without knowledge of the physicochemical interactions between products. This study aimed to assess the effects of different addition sequences of the herbicide aminopyralid + fluroxypyr and adjuvants in the preparation of phytosanitary spray solutions on the surface tension and contact angle. Two experiments were carried out with herbicide doses of 1 and 2 L ha-1 associated with the adjuvants mineral oil (MO), silicone-polyether copolymer (SIL), and a mixture of phosphatidylcholine (lectin) and propionic acid (LEC), all at a proportion of 0.3% v v-1. The application rate was 150 L ha-1. Surface tension was measured by the pendant droplet method. Contact angle was measured on the adaxial and abaxial surfaces of leaves of the pasture weed Senna obtusifolia and parafilm. Preparation sequence did not change the contact angle on any of the analyzed surfaces at a dose of 1 L ha-1 of herbicide. For the dose of 2 L ha-1, the adjuvants SIL and LEC showed a higher spreading when previously added to the herbicide. MO resulted in a higher spreading when added after the herbicide, with higher surface coverage. Therefore, the preparation sequence influences the dispersion of phytosanitary spray solutions on targets.

scholarly journals Effect of Droplet Distortion on Surface Tension in Electromagnetic Levitation Method

2000 ◽  
Vol 40 (Suppl) ◽  
pp. S144-S147
Author(s):  
K. Nogi ◽  
T. Nakano ◽  
T. Matsumoto ◽  
H. Fujii
Keyword(s):  
Surface Tension ◽  
Electromagnetic Levitation

Comparison of surface tension measurements using the levitated droplet method

1986 ◽  
Vol 17 (1) ◽  
pp. 159-162 ◽  
Author(s):  
B. J. Keene ◽  
K. C. Mills ◽  
A. Kasama ◽  
A. McLean ◽  
W. A. Miller
Keyword(s):  
Surface Tension ◽  
Levitated Droplet ◽  
Droplet Method

scholarly journals Surface tension of liquid nickel: Re-evaluated and revised data

2020 ◽  
Vol 49 (1-2) ◽  
pp. 107-124 ◽  
Author(s):  
ANNA WERKOVITS ◽  
THOMAS LEITNER ◽  
GERNOT POTTLACHER
Keyword(s):  
Surface Tension ◽  
Vertical Direction ◽  
Electromagnetic Levitation ◽  
Extensive Literature ◽  
Liquid Nickel ◽  
Surface Tension Data ◽  
University Of Technology ◽  
Wide Range ◽  
First Results ◽  
Elevated Surface

Nickel is an important component in many alloys, so reliable surface tension data in the liquid phase are essential for simulation processes in the metal industry. First results for surface tension of liquid nickel from our working group by Aziz et al. [1], which led to the first publication on the topic of our Electromagnetic Levitation (EML) setup, delivered unusual high values compared to the literature, which itself covers a wide range. To find the reason for this behaviour the aim of this work was to investigate the surface tension of nickel samples from different suppliers at similar purity grades by the Oscillating Drop (OD) technique using the EML setup of the Thermophysics and Metalphysics Group at Graz University of Technology. Since no significant deviations between samples from different suppliers have been found, an extensive literature research according to various experimental and evaluation parameters has been performed. In the course of this investigation, the earlier obtained experimental data of Aziz et al. were re-evaluated. Due to gained awareness in evaluating the translational frequency in vertical direction, the mystery of these elevated surface tension results could be solved, so that in the end the originally obtained results of Aziz have been drastically decreased through re-evaluation.

Surface Tension Measurements of Industrial Alloys

2006 ◽  
Vol 508 ◽  
pp. 573-578 ◽  
Author(s):  
Frank Schmidt-Hohagen ◽  
Ivan Egry
Keyword(s):  
Surface Tension ◽  
High Speed ◽  
Vacuum Chamber ◽  
Equilibrium Shape ◽  
High Vacuum ◽  
Electromagnetic Levitation ◽  
Video Sequences ◽  
Rayleigh Law ◽  
Component Systems ◽  
Drop Technique

Industrial alloys are generally multi-component systems with volatile and highly reactive components. Consequently, their processing in the liquid state requires special precautions. Therefore, an existing electromagnetic-levitation device with a high-vacuum chamber, designed for surface tension measurements, was modified and improved. For the measurements of the surface tensions with the help of the oscillating drop technique the temperatures and the video sequences of the levitated, molten alloy were recorded without contact by pyrometer and by high-speed camera, respectively. This method yields the frequencies of the surface oscillations of the sample around the equilibrium shape and - using the modified Rayleigh law - eventually the values of the surface tension. With the help of this method two commercial industrial steels were processed in the new EML-apparatus for ESA`s Thermolab project [1]. The results of these measurements are presented and discussed

Measurement of dynamic surface tension by the oscillating droplet method

1993 ◽  
Vol 15-15 (4-5) ◽  
pp. 332-340 ◽  
Author(s):  
B. Stückrad ◽  
W. J. Hiller ◽  
T. A. Kowalewski
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Droplet Method
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