Advancing contact angle of iron ores as a function of their hematite and goethite content: implications for pelletising and sintering

2004 ◽  
Vol 74 (1-4) ◽  
pp. 281-287 ◽  
Author(s):  
S.M. Iveson ◽  
S. Holt ◽  
S. Biggs
Keyword(s):  
Contact Angle ◽  
Iron Ores ◽  
Advancing Contact Angle

scholarly journals Contact angle of water on iron ore fines: Measurement and analysis

2015 ◽  
Vol 51 (1) ◽  
pp. 33-40 ◽  
Author(s):  
X.B. Huang ◽  
X X.W. ◽  
J.J. Song ◽  
C.G. Bai ◽  
R.D. Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Iron Ore ◽  
Contact Angles ◽  
Physical Parameters ◽  
Iron Ores ◽  
New Model ◽  
Pressure Method ◽  
Measurement And Analysis ◽  
Iron Ore Fines ◽  
Good Agreement

The relative contact angle (?RCA) for seven iron ore fines was measured by using Washburn Osmotic Pressure method under laboratory conditions. By choosing cyclohexane as the reference that can perfectly wet iron ore particles, the relative contact angles were measured and varied from 57? to 73?. With the volume % of goethite (?G) as the variable, a new model for relative contact angle was developed. The expected relative contact angle for pure goethite is about 56?, while that for goethite free samples is about 77?. Physical properties, such as surface morphology (SMI) and pore volume (Vpore) can influence the relative contact angle. The ?G can be expressed as a function of SMI and VPore. Thus, we inferred that the relative contact angle is a function of ?G for the iron ores used. The measured relative contact angles were found to be in good agreement (Radj 2 >0.97) with the calculated ones based on the research from Iveson, et al. (2004). Comparing with the model developed by Iveson et al.(2004), the new model for contact angle proposed in this paper is similar, but more detailed with two meaningful physical parameters. The modification of physicochemical properties on iron ores would be another topic in the further study on granulation.

Urine Advancing Contact Angle on Several Surfaces

2009 ◽  
Vol 23 (15) ◽  
pp. 1917-1923 ◽  
Author(s):  
Evan A. Thomas ◽  
Darwin H. Poritz ◽  
Dean L. Muirhead
Keyword(s):  
Contact Angle ◽  
Advancing Contact Angle

Spontaneous Spreading of a Droplet: The Role of Solid Continuity and Advancing Contact Angle

Langmuir ◽  
2018 ◽  
Vol 34 (17) ◽  
pp. 4945-4951 ◽  
Author(s):  
Youhua Jiang ◽  
Yujin Sun ◽  
Jaroslaw W. Drelich ◽  
Chang-Hwan Choi
Keyword(s):  
Contact Angle ◽  
Advancing Contact Angle

scholarly journals Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

2012 ◽  
Vol 9 (73) ◽  
pp. 1965-1974 ◽  
Author(s):  
A. Roth-Nebelsick ◽  
M. Ebner ◽  
T. Miranda ◽  
V. Gottschalk ◽  
D. Voigt ◽  
...  
Keyword(s):  
Contact Angle ◽  
Leaf Surface ◽  
Contact Angle Hysteresis ◽  
Maximum Size ◽  
Large Degree ◽  
Namib Desert ◽  
Fog Water ◽  
Water Conduction ◽  
Key Factor ◽  
Advancing Contact Angle

The Namib grass Stipagrostis sabulicola relies, to a large degree, upon fog for its water supply and is able to guide collected water towards the plant base. This directed irrigation of the plant base allows an efficient and rapid uptake of the fog water by the shallow roots. In this contribution, the mechanisms for this directed water flow are analysed. Stipagrostis sabulicola has a highly irregular surface. Advancing contact angle is 98° ± 5° and the receding angle is 56° ± 9°, with a mean of both values of approximately 77°. The surface is thus not hydrophobic, shows a substantial contact angle hysteresis and therefore, allows the development of pinned drops of a substantial size. The key factor for the water conduction is the presence of grooves within the leaf surface that run parallel to the long axis of the plant. These grooves provide a guided downslide of drops that have exceeded the maximum size for attachment. It also leads to a minimum of inefficient drop scattering around the plant. The combination of these surface traits together with the tall and upright stature of S. sabulicola contributes to a highly efficient natural fog-collecting system that enables this species to thrive in a hyperarid environment.

scholarly journals Transient analysis of advancing contact angle measurements on polished rock surfaces

2018 ◽  
Vol 119 ◽  
pp. 142-149 ◽  
Author(s):  
C.H. Gates ◽  
E. Perfect ◽  
B.S. Lokitz ◽  
J.W. Brabazon ◽  
L.D. McKay ◽  
...  
Keyword(s):  
Contact Angle ◽  
Transient Analysis ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Advancing Contact Angle
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