Capillary effect might be observed in narrow tube or micro-channel due to various properties (surface tension of fluid, contact angle, hydrophobicity or phillicity of structures, etc). 

I hope to know how much is the magnitude of the force in the micro-niche. Many reserarchers reported capillary driven flow based micro device, however I couldn't find a reports discussing the magnitude of force yet. Since the magnitude will be changed according to aforementioned conditions, just let me know the range of the force or order(pN, nN.. etc).

Or, if you know an example concering capillary driven flow based microdevice including force analysis, inform to me about that. (e.g. 10x10um channel, fluids: water, structure material: PDMS, capillary force(or pressure)= 10 pN.)

References which I found are as follows;

Harry J. Barraza, et al., Advancing Contact Angles of Newtonian Fluids During “High” Velocity, Transient, Capillary-Driven Flow in a Parallel Plate Geometry, J. Phys. Chem. B, 2002, 106, 4979-4987.

Hyeran Noh and Scott T. Phillips, Metering the Capillary-Driven Flow of Fluids in Paper-Based Microfluidic Devices, Anal. Chem. 2010, 82, 4181-4187.

Yongkang Chen, et al. Capillary driven flow in micro scale surface structures, Microelectronic Engineering, 86, 2009, 1317-1320.

Yu Chang Kim, et el. Plasma extraction in a capillary-driven microfluidic device using surfactant-added poly(dimethylsiloxane), Sensors and Acutators B, 145, 2010, 861-868

Thanks.

Dongkyu Lee