Abstract
Abstract In this article, we investigate the time-periodic pulse electroosmotic flow (EOF) of Jeffreys fluids through a microannulus. By using the Laplace transform method, the velocity expression of the pulse EOF is derived. The effect of some variables on the time it takes for the fluid to go from a static state to a flowing state is analyzed. We find that increasing the relaxation time λ ¯ 1 {\bar{\lambda }}_{\text{1}} and decreasing the inner and outer radius ratio α \alpha will result in longer time for the fluid to reach the flowing state, but the retardation time λ ¯ 2 {\bar{\lambda }}_{\text{2}} and the inner and outer zeta potential ratio β \beta have little effect on it. The impact of some related parameters on the pulse EOF velocity for different inner and outer radius ratios ( α \alpha ) is discussed in detail. The results show that for a smaller inner and outer radius ratio α \alpha , the velocity amplitude increases with the relaxation time λ ¯ 1 {\bar{\lambda }}_{\text{1}} and decreases with the retardation time λ ¯ 2 {\bar{\lambda }}_{\text{2}} . As the inner and outer radius ratio α \alpha increases, the effect of relaxation time λ ¯ 1 {\bar{\lambda }}_{\text{1}} on velocity amplitude gradually weakens or even becomes insignificant, and the effect of the retardation time λ ¯ 2 {\bar{\lambda }}_{\text{2}} on the velocity amplitude remains unchanged. Moreover, the velocity amplitude will decrease with the increase in the inner and outer radius ratio α \alpha and its change range will expand from the electric double layer near the annular wall to the entire flow region.
Highlights
In this article, we investigate the time-periodic pulse electroosmotic flow (EOF) of Jeffreys fluids through a microannulus
Taking into account the wide application of pulse current (PC) in materials engineering in recent years [31,32], combined with the remarkable advantages of the annular channel, the main purpose of this article is to study the time-periodic pulse EOF of Jeffreys fluids through a microannulus
Pulse electroosmotic flow of Jeffreys fluids through a microannulus 869
Summary
Abstract: In this article, we investigate the time-periodic pulse electroosmotic flow (EOF) of Jeffreys fluids through a microannulus. The Jeffreys fluid model, as a typical non-Newtonian fluid model, has received special attraction from researchers due to its wide application in biology, industry, and other fields. In this fluid model, the two parameters λ1 and λ2 describe the behavior of the relaxation and retardation times, respectively [20]. Taking into account the wide application of pulse current (PC) in materials engineering in recent years [31,32], combined with the remarkable advantages of the annular channel (for instance, compact structure, large heat transfer area, good fluidity, and high heat transfer coefficient), the main purpose of this article is to study the time-periodic pulse EOF of Jeffreys fluids through a microannulus. The semi-analytical expression of velocity is obtained and the influence of some parameters on it is discussed
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