Mimicking wettability alterations using temperature gradients for water nanodroplets

Chirodeep Bakli; Sree Hari P. D.; Suman Chakraborty

doi:10.1039/c7nr03320f

Mimicking wettability alterations using temperature gradients for water nanodroplets

Nanoscale ◽

10.1039/c7nr03320f ◽

2017 ◽

Vol 9 (34) ◽

pp. 12509-12515 ◽

Cited By ~ 11

Author(s):

Chirodeep Bakli ◽

Sree Hari P. D. ◽

Suman Chakraborty

Keyword(s):

Water Droplet ◽

Marangoni Effect ◽

Temperature Gradients ◽

Hydrophobic Substrate

A sessile water droplet moves from colder to warmer regions on a hydrophobic substrate, guided by the coupled effects of wettability and evaporation, demonstrating ‘reverse-Marangoni effect’.

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Marangoni-effect velocity distribution due to time-oscillatory temperature gradients in zero-gravity environment

Acta Mechanica ◽

10.1007/bf01176772 ◽

1983 ◽

Vol 46 (1-4) ◽

pp. 167-187 ◽

Cited By ~ 8

Author(s):

H. F. Bauer

Keyword(s):

Velocity Distribution ◽

Marangoni Effect ◽

Temperature Gradients ◽

Zero Gravity ◽

Oscillatory Temperature

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Size Effect on Micro-Droplet Movement Due to Marangoni Effect

Heat Transfer: Volume 2 ◽

10.1115/ht2003-47163 ◽

2003 ◽

Author(s):

Yuan-Tai Tseng ◽

Fan-Gang Tseng ◽

Ching-Chang Chieng

Keyword(s):

Driving Force ◽

Marangoni Effect ◽

Contact Angles ◽

Temperature Gradients ◽

Two Dimensional ◽

Fundamental Physics ◽

Droplet Movement ◽

Recirculation Zones ◽

Comparison With Experiments ◽

Moving Speed

Fundamental physics are studied on the movement of droplets for sizes ranging from 0.1 μl to 1.0 μl on a solid surface subjected to temperature gradients using numerical computations and the comparison with experiments. The receding/advancing contact angles relating to the droplet size and shape are the key parameters of droplet moving and the differences subjected to the temperature gradients induce unbalanced recirculation zones inside the moving droplet, thus induces driving force to drag the droplet. It is found that droplet of smaller size moves faster with smoothly changing speed and the droplet of larger size moves with fluctuating speed and the average moving speed is roughly the same magnitude as that with two-dimensional heating.

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