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Shear‐rate‐dependent rheology effects on mass transport and surface reactions in biomicrofluidic devices
Author(s) -
Sadeghi Arman,
Amini Younes,
Saidi Mohammad Hassan,
Yavari Hadi
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14781
Subject(s) - rheology , electrokinetic phenomena , mechanics , damköhler numbers , shear rate , power law fluid , pressure gradient , chemistry , shear thinning , newtonian fluid , thermodynamics , materials science , physics , turbulence
Consideration is given to shear‐rate‐dependent rheology effects on mass transport in a heterogeneous microreactor of rectangular cross section, utilizing both numerical and analytical approaches. The carrier liquid obeys the power‐law viscosity model and is actuated primarily by an electrokinetic pumping mechanism. It is discovered that, considering the shear‐thinning biofluids to be Newtonian fluids gives rise to an overestimation of the saturation time. The degree of overestimation is higher in the presence of large Damkohler numbers and electric double layer thicknesses. It is also increased by the application of a favorable pressure gradient, whereas the opposite is true when an opposed pressure gradient is applied. In addition, a channel of square cross section corresponds to the maximum fluid rheology effects. Finally, the numerical results indicate the existence of a concentration wave when using long channels. This is confirmed by analytical solutions, providing a closed form solution for wave propagation speed. © 2015 American Institute of Chemical Engineers AIChE J , 61: 1912–1924, 2015