Density measurements on levitated liquid metal droplets

被引：23

作者：

Gorges, E ^{[1
]}

Racz, LM ^{[1
]}

Schillings, A ^{[1
]}

Egry, I ^{[1
]}

机构：

[1] TUFTS UNIV,DEPT MECH ENGN,MEDFORD,MA 02155

来源：

INTERNATIONAL JOURNAL OF THERMOPHYSICS | 1996年 / 17卷 / 05期

关键词：

density; image processing; levitation; liquid metals; nickel; undercooled melt;

D O I：

10.1007/BF01442003

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Electromagnetic levitation is a useful tool for measuring thermophysical properties of high-temperature melts such as liquid metals. Due to its noncontact nature, the undercooled regime is also accessible. Density and thermal expansion of a levitated drop can be derived from volume measurements, if its mass is known. Assuming cylindrical symmetry, the volume of a drop can be determined from its cross section. Using photography, such measurements on liquid metals have been performed in the past. Here we present an improvement of this method, which replaces the photographic camera with a CCD videocamera and subsequent digital image processing. This reduces the time effect required to obtain the results and allows one to average over disturbing surface oscillations. The specific problems of digital image processing, namely resolution and edge detection, are addressed and results on nickel are presented.

引用

页码：1163 / 1172

页数：10

共 4 条

[1] Brandes E.A., 1983, SMITHELLS METALS REF
[2] CONTAINERLESS PROCESSING IN THE STUDY OF METALLIC MELTS AND THEIR SOLIDIFICATION
HERLACH, DM
COCHRANE, RF
EGRY, I
FECHT, HJ
GREER, AL
[J]. INTERNATIONAL MATERIALS REVIEWS, 1993, 38 (06) : 273 - 347
[3] ADVANCES IN THE MEASUREMENT OF DENSITY AND THERMAL-EXPANSION OF UNDERCOOLED LIQUID-METALS
RACZ, LM
EGRY, I
[J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1995, 66 (08) : 4254 - 4258
[4] Shiriashi SY., 1964, Can. Met. Quat, V3, P117, DOI [10.1179/cmq.1964.3.1.117, DOI 10.1179/CMQ.1964.3.1.117]

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