...F. Talay Akyildiz; Dennis A. Siginer; M'hamed Boutaous Unsteady laminar nonlinear slip flow of power law fluids in a microchannel is investigated. The nonlinear partial differential equation resulting from the momentum balance is solved with linear as well as nonlinear boundary conditions...

...Mohamed S. El-Genk; Mahyar Pourghasemi Analytical and computational fluid dynamics (CFD) analyses confirmed the presence of apparent slip for water flow in microchannels with equivalent hydraulic diameter, D h < 10 3 μ m, markedly decreasing the friction number, fRe in . The determined values...

... compared to the residence time. In this work we demonstrate the merits of the combination of flow pulsation and geometrical characteristics in enhancing mixing efficiency in microchannels. Mixing was studied by introducing a mixing index based on the gray level observed in a heterogeneous flow of pure...

... of the electroosmotic flow induced within a microchannel with a complex-wavy surface by a time-varying periodic electric field. The effects of the Strouhal number of the periodic electric potential, the amplitude of the periodic electric potential, the amplitude of the complex-wavy surface, and the waveform geometry...

... in microfluidic devices including two-phase microfluidic systems. Fluorescent tracers have been used to study mixing in the liquid phase of a segmented gas-liquid flow in straight and meandering microchannels, where mixing is considered complete when the concentration of the dye is uniform within the liquid slug...

... used as ultrasound contrast agents. In this paper we use a low-cost flow focusing microchannel fabrication method for preparing microbubble contrast agents by using some surface active agents and a viscosity enhancing material to obtain appropriate microbubbles with desired lifetime and stability...

... heating may pinch the microchannel flow due to the air layer invading into the liquid layer. superhydrophobic surfaces microchannel thermal effects pinching friction Experimental setup of pressure measurement test A resistive heating pad was placed directly underneath...

...E. Galvis; S. Yarusevych; J. R. Culham In many engineering systems, such as compact heat exchangers and microcoolers used in electronics packaging, system performance depends on laminar flow development in microchannels. This study investigates effects of Reynolds number, hydraulic diameter...

...A. Tamayol; K. Hooman Closed form solutions are presented for fully developed pressure driven slip-flow in straight microchannels of uniform noncircular cross-sections. To achieve this goal, starting from the general solution of the Poisson’s equation in the cylindrical coordinate, a least-squares...

...Auro Ashish Saha; Sushanta K. Mitra A two-dimensional numerical simulation of flow in patterned microchannel with alternate layers of different sizes of hydrophilic and hydrophobic surfaces at the bottom wall is conducted here. The effect of specified contact angle and working fluid (de-ionized (DI...

... velocity profiles identical to that of a straight channel. The pressure ratio decreases when the fillet radius and the Knudsen number are increased. 02 12 2007 04 06 2008 12 09 2008 flow separation Knudsen flow laminar flow microchannel flow slip flow microchannel...

...Prashant R. Waghmare; Sushanta K. Mitra The present study is carried out to investigate the influence of surface roughness in combined electro-osmotic and pressure-driven flow in microchannel. Two-dimensional theoretical model is developed to predict the behavior of velocity profiles in rough...

...Chungpyo Hong; Yutaka Asako; Stephen E. Turner; Mohammad Faghri Poiseuille number, the product of friction factor and Reynolds number (fRe) for quasi-fully-developed gas microchannel flow in the slip flow regime, was obtained numerically based on the arbitrary-Lagrangian-Eulerian method. Two...

...S. Garimella; J. D. Killion; J. W. Coleman This paper reports the development of an experimentally validated model for pressure drop during intermittent flow of condensing refrigerant R134a in horizontal microchannels. Two-phase pressure drops were measured in five circular channels ranging...