[1] We explore physical mechanisms controlling formation of a confining conduit plug using 1D, steady-state numerical models of magma ascent. Model results for the welldocumented 1997 Vulcanian explosions at Soufrière Hills volcano were compared against subsurface conditions constrained by geophysical and petrologic analysis. We suggest that, if magma is permeable and overpressured and rock sur...

The present work numerically simulates the flow of a single isolated liquid plug (of glycerine and water, respectively) flowing in a round capillary tube (ID = 2.0 mm), to understand its local thermal transport behavior. When an isolated liquid plug moves in a capillary tube there is a difference in the advancing and receding dynamic contact angles of the two menisci, respectively. This has bee...

A novel microdevice for passively mixing liquid samples based on surface tension and a geometrical mixing chamber is presented. Due to the laminar flow regime on the microscale, mixing becomes difficult if not impossible. We present a micromixer where a constantly changing time dependent flow pattern inside a two sample liquid plug is created as the plug simply passes through the planar mixer c...

An understanding of pressure propagation mechanisms is crucial in finding suitable conditions for the temporary storage, transmission and attenuation a large signal multi-plug gelled pipeline. The current work investigates transient flow start pipeline, filled with weakly compressible, thixotropic waxy crude oil. A gel can form either naturally or artificially. We solve time-dependent mass mome...

Performance efficiency in a Downflow Hanging Sponge (DHS) bioreactor is associated with the amount of time that a wastewater remains in the bioreactor. The bioreactor is considered as a plug flow reactor and its hydraulic residence time (HRT) depends on the void volume of packing material and the flow rate. In this study, hydraulic behavior of DHS bioreactor was investigated by using tracer met...

Dispersion coefficients for turbulent flow are commonly available, but the common models are not easily implemented for fast computation of dispersion in timedependent large flow systems. Criteria were developed to aid in the choice of parameters for a model combining plug flow with the N-continuously-stirred-tanks model to obtain the best agreement with the pure axial-dispersed plug-flow model...

Choosing between multiple ontological perspectives is crucial for reasoning about the physical world. Choosing the wrong perspective can make a reasoning task impossible. This paper introduces a Lagrangian plug flow ontology (PF) for reasoning about thermodynamic fluid flow. We show that this ontology captures continuously changing behaviors of flowing fluids not represented in currently implem...