Abstract
An extended meniscus of a ferrofluid solution on a silicon surface is subjected to axisymmetric, non-uniform magnetic field resulting in significant forward movement of the thin liquid film. Image analyzing interferometry is used for accurate measurement of the film thickness profile, which in turn, is used to determine the instantaneous slope and the curvature of the moving film. The recorded video, depicting the motion of the film in the Lagrangian frame of reference, is analyzed frame by frame, eliciting accurate information about the velocity and acceleration of the film at any instant of time. The application of the magnetic field has resulted in unique changes of the film profile in terms of significant non-uniform increase in the local film curvature. This was further analyzed by developing a model, taking into account the effect of changes in the magnetic and shape-dependent interfacial force fields.
Highlights
Process intensification in the micro-scale domain has been garnering attention due to their inherent abilities and advantages to control the transport phenomena with a minimal expense of resources[1,2]
Equilibrium dynamics of thin liquid films have been reviewed and reported by Starov[43], whereas the wetting and spreading near the three phase contact line has been investigated by Bonn et al.[44]
The net differential magnetic force experienced at any point in the permeable medium is obtained from the general Maxwell stress equation[47] in the tensorial notation as in, f=
Summary
Process intensification in the micro-scale domain has been garnering attention due to their inherent abilities and advantages to control the transport phenomena with a minimal expense of resources[1,2]. Chakraborty et al.[45] investigated the effect of introducing negatively charged nano particles to the thin liquid film (TLF) and studied the associated dynamics by subjecting the thin film to DC electric field They observed that the addition of nano particles enhanced the thermal conductivity of the motive liquid and increased the net forward motion of the liquid meniscus. These studies on the dynamics of thin liquid films underscore the effectiveness and ease of applying electrical mode of actuation to the thin liquid film and the potentiality of direct application to microscale processes. The application of magnetic field to droplets and studying their dynamics[33,46] have shed light on the alternative options available for fluid manipulation and corresponding applications
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