ventional methods to investigate colloid transport often involve column studies. Here, colloid concentrations are A new experimental approach and complementary model analysis measured at the column effluent or at selected points are presented for studying colloid transport and fate in porous media. The experimental approach combines high precision etching to create along the column length. Unfo...

Telecommunications Infrastructure and Economic Development: A Simultaneous Approach* In this paper we investigate how telecommunications infrastructure affects economic growth. This issue is important and has received considerable attention in the popular press concerning the creation of the "information superhighway" and its potential impacts on the economy. We use evidence from 21 OECD countr...

Thin films of water in a single pore act as elastic membranes under tension that increase capillary pressures without increasing the dissipated mechanical work. A single wedge-shaped microfluidic pore was fabricated using two-photon laser machining of the photoresist SU-8 to have sharp corners at the pore entrance from the nonwetting reservoir. The singular geometry acts as a strong pinning def...

Micromodels with a simplified porous network that represents geological porous media have been used as experimental test beds for multiphase flow studies in the petroleum industry. We present a new method to fabricate reservoir micromodels with heterogeneous wetting properties. Photopatterned, copolymerized microstructures were fabricated in a bottom-up manner. The use of rationally designed co...

A transient, three-dimensional model for thermal transport in heat pipes and vapor chambers is developed. The Navier–Stokes equations along with the energy equation are solved numerically for the liquid and vapor flows. A porous medium formulation is used for the wick region. Evaporation and condensation at the liquid–vapor interface are modeled using kinetic theory. The influence of the wick m...

The mixed-wet nature of reservoir formations imposes a wide range rock wettability from strong resident-fluid wetting to invading-fluid wetting. characteristics two-phase flow in porous media composed mixed-wetting surfaces remain poorly understood. In this study, we investigated the displacement resident ethylene glycol (EG) by hexane two micromodels identical 2.5-D geometry heterogeneity, wit...

We study the gravity-exchange flow of two immiscible fluids in a porous medium and show that, in contrast with the miscible case, a portion of the initial interface remains pinned at all times. We elucidate, by means of micromodel experiments, the pore-level mechanism responsible for capillary pinning at the macroscale. We propose a sharp-interface gravity-current model that incorporates capill...

Telecommunications Infrastructure and Economic Development: A Simultaneous Approach* In this paper we investigate how telecommunications infrastructure affects economic growth. This issue is important and has received considerable attention in the popular press concerning the creation of the "information superhighway" and its potential impacts on the economy. We use evidence from 21 OECD countr...