Liquid Materials and Flow Processes in Reduced Gravity

1981 ◽  
Vol 9 ◽  
Author(s):  
L. E. Scriven
Keyword(s):  
Viscous Flow ◽  
Convective Transport ◽  
Fluid Interfaces ◽  
Research Needs ◽  
Reduced Gravity ◽  
Effective Gravity ◽  
Capillary Phenomena ◽  
Flow Processes

ABSTRACTFluid states are central to melt and vapor processing. Fluids flow. As they do they convect heat, solutes, and inclusions. Liquid/gas interfaces have tension. Their importance rises when scale is small or effective gravity low.The forces that move fluids and mold fluid interfaces are recounted here. Fundamentals of viscous flow, convective transport, and capillary phenomena are summarized with special attention to the roles of gravity in liquid processing. Research needs are highlighted.

IMPACT OF ALIGN MAGNETIC FIELD ON VISCOUS FLOW WITH COMBINED CONVECTIVE TRANSPORT

2021 ◽  
Vol 23 (1) ◽  
pp. 127-137
Author(s):  
Siti Farah Haryatie Mohd Kanafiah ◽  
Hussein Ali Mohammed Al-Sharifi
Keyword(s):  
Magnetic Field ◽  
Viscous Flow ◽  
Convective Transport

Flow Analysis for a Flow Channel Instrument to Evaluate Viscosities of Non-Newtonian Viscoelastic Liquid Foods

2017 ◽  
Vol 13 (9) ◽  
Author(s):  
Masanori Yoshida ◽  
Hitoshi Igarashi ◽  
Kento Iwasaki ◽  
Sayaka Fuse ◽  
Yuko Tsuruta ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Viscous Flow ◽  
Flow Analysis ◽  
Relative Magnitude ◽  
Flow Channel ◽  
Viscoelastic Liquid ◽  
Flow Measurements ◽  
Flow Processes ◽  
Liquid Foods

AbstractTo develop a structurally simple and easy-to-use viscometer for liquid foods, flow measurements and analyses were done in a flow channel instrument. Newtonian and non-Newtonian test liquids respectively employed in the experiments show viscosity and viscoelasticity. Changes of the modified friction coefficient during the flow processes characterized viscous flow in the instrument. The elasticity was found to be dominant in the early process, reducing the flow as a function of the relative magnitude of liquid viscoelasticity.

scholarly journals Fluid interfaces with very sharp tips in viscous flow

2020 ◽  
Vol 117 (51) ◽  
pp. 32238-32243
Author(s):  
Sylvain Courrech du Pont ◽  
Jens Eggers
Keyword(s):  
Viscous Flow ◽  
Electric Fields ◽  
External Flow ◽  
Opening Angle ◽  
Radius Of Curvature ◽  
Logarithmic Scale ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Nonlocal Coupling ◽  
Analytical Technique

When a fluid interface is subjected to a strong viscous flow, it tends to develop near-conical ends with pointed tips so sharp that their radius of curvature is undetectable. In microfluidic applications, tips can be made to eject fine jets, from which micrometer-sized drops can be produced. Here we show theoretically that the opening angle of the conical interface varies on a logarithmic scale as a function of the distance from the tip, owing to nonlocal coupling between the tip and the external flow. Using this insight we are able to show that the tip curvature grows like the exponential of the square of the strength of the external flow and to calculate the universal shape of the interface near the tip. Our experiments confirm the scaling of the tip curvature as well as of the interface’s universal shape. Our analytical technique, based on an integral over the surface, may also have far wider applications, for example treating problems with electric fields, such as electrosprays.

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