Capillary driven flow

Figure 2-17. A series of photographs of the time-dependent breakup of a drop hy the capillary-driven flow mechanism that is known as end-pinching. The drop is initially stretched in a flow, and then the flow is stopped, allowing the drop shape to evolve toward breakup. The viscosity of the drop relative to the suspending fluid is 1.2.

Methods available to control non-Newtonian flows are the same as for Newtonian flows, including pressure-driven flows via syringe pumps, capillary-driven flows, and electrokinetic flows. These methods and others are covered in more detail in other entries. In many cases the behavior of polymer solutions subject to a driving force is similar to that of the corresponding Newtonian solvent as long as the characteristic strain rate remains below the coil-stretch transition or De <2- Above this critical value, shear thinning and elasticity are important. 

Betelh S.I. and Diez J.A. (1999). A two-dimensional similarity solution for capillary driven flows. Physica D, 126,136-140. 

Role of Capillary Driven Flow in Composite Manufacturing... 

Yongkang Chen, L. S. Melvin, S. Rodriguez, D. Bell and M.M. Weislogel, Capillary driven flow in micro scale surface structures. Microelec. Eng. 86, 1317-1320 (2009). 

Stange M, Dreyet M, Rath J. (2003) Capillary driven flow in circular cylindrical tubes. Phys Fluids 15 2587-2601. 

Atypical drying curve of a foodstuff can be subdivided into phases. The first period is one of constant diy ing rate per unit of surface area During this period, the surface is kept wet by the constant capillary-driven flow of water from within the particle. The factors that determine and limit the rate of drying in the so-called constant rate period. It describes the state of the air, temperature and relative humidity as well as air velocity. 

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