Visualization of Flow Boiling in an Annular Heat Exchanger Under Microgravity Conditions

Westheimer, David; Peterson, G. P.

doi:10.2514/2.6612

Cited by 16 publications

(1 citation statement)

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“…Microannulus is a widely applicable form of microchannels used in the design and fabrication process of many practical micro technologies such as micro-heat pipes, -heat exchangers, -mixers, and micro-reactors (Nouri-Borujerdi and Layeghi 2005;Westheimer and "Bud" Peterson 2001;Scampavia et al 1995;Kuznetsov et al 2009). In practice, EOF in a capillary annulus is encountered in applications such as electrophoretic separation of proteins and chemical remediation of contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nonlinear Electrokinetic and Rheological Behaviors of Typical Non-Newtonian Biofluids through Annular Microchannels

Hamedi¹,

Shamshiri

Charmiyan³

et al. 2016

JAFM

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Electroosmosis is the predominant mechanism for flow generation in lab-on-chip devices. Since most biofluids encountered in these devices reveal non-Newtonian behavior, a special understanding of the fundamental physics of the relevant transport phenomena seems vital for an accurate design of such miniaturized devices. In this study, a numerical analysis is presented to explore transport characteristics of typical non-Newtonian biofluids through annular microchannels under combined action of pressure and electrokinetic forces. The flow is considered steady and hydrodynamically fully developed. A finite difference method is used to solve the Poisson-Boltzmann and Cauchy momentum equations, while the classical boundary condition of no velocity-slip for the flow field is applied. The Poisson-Boltzmann equation is solved in the exact form without using the Debye-Hückel approximation. After numerically solving the governing equations, role of the key parameters in hydrodynamic behavior of the flow is analyzed and discussed. Keywords

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Section: Introductionmentioning

confidence: 99%